From af58a6f883108f02996c784de010df62e75f5e13 Mon Sep 17 00:00:00 2001
From: Serhiy Storchaka <storchaka@gmail.com>
Date: Tue, 9 Sep 2025 21:07:21 +0300
Subject: [PATCH 1/4] gh-88886: Remove excessive encoding name normalization
 (GH-137167)

The codecs lookup function now performs only minimal normalization of
the encoding name before passing it to the search functions:
all ASCII letters are converted to lower case, spaces are replaced
with hyphens.

Excessive normalization broke third-party codecs providers, like
python-iconv.

Revert "bpo-37751: Fix codecs.lookup() normalization (GH-15092)"

This reverts commit 20f59fe1f7748ae899aceee4cb560e5e1f528a1f.
---
 Doc/library/codecs.rst                        | 21 ++++++---
 Lib/test/test_capi/test_codecs.py             |  1 -
 Lib/test/test_codecs.py                       | 26 +++++-----
 ...5-07-28-17-01-05.gh-issue-88886.g4XFPb.rst |  4 ++
 Python/codecs.c                               | 47 ++++++++++---------
 5 files changed, 54 insertions(+), 45 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Core_and_Builtins/2025-07-28-17-01-05.gh-issue-88886.g4XFPb.rst

diff --git a/Doc/library/codecs.rst b/Doc/library/codecs.rst
index 5932012c535b56..90a695ef937f75 100644
--- a/Doc/library/codecs.rst
+++ b/Doc/library/codecs.rst
@@ -68,11 +68,21 @@ The full details for each codec can also be looked up directly:
    Looks up the codec info in the Python codec registry and returns a
    :class:`CodecInfo` object as defined below.
 
-   Encodings are first looked up in the registry's cache. If not found, the list of
+   This function first normalizes the *encoding*: all ASCII letters are
+   converted to lower case, spaces are replaced with hyphens.
+   Then encoding is looked up in the registry's cache. If not found, the list of
    registered search functions is scanned. If no :class:`CodecInfo` object is
    found, a :exc:`LookupError` is raised. Otherwise, the :class:`CodecInfo` object
    is stored in the cache and returned to the caller.
 
+   .. versionchanged:: 3.9
+      Any characters except ASCII letters and digits and a dot are converted to underscore.
+
+   .. versionchanged:: next
+      No characters are converted to underscore anymore.
+      Spaces are converted to hyphens.
+
+
 .. class:: CodecInfo(encode, decode, streamreader=None, streamwriter=None, incrementalencoder=None, incrementaldecoder=None, name=None)
 
    Codec details when looking up the codec registry. The constructor
@@ -167,14 +177,11 @@ function:
 .. function:: register(search_function, /)
 
    Register a codec search function. Search functions are expected to take one
-   argument, being the encoding name in all lower case letters with hyphens
-   and spaces converted to underscores, and return a :class:`CodecInfo` object.
+   argument, being the encoding name in all lower case letters with spaces
+   converted to hyphens, and return a :class:`CodecInfo` object.
    In case a search function cannot find a given encoding, it should return
    ``None``.
 
-   .. versionchanged:: 3.9
-      Hyphens and spaces are converted to underscore.
-
 
 .. function:: unregister(search_function, /)
 
@@ -1065,7 +1072,7 @@ or with dictionaries as mapping tables. The following table lists the codecs by
 name, together with a few common aliases, and the languages for which the
 encoding is likely used. Neither the list of aliases nor the list of languages
 is meant to be exhaustive. Notice that spelling alternatives that only differ in
-case or use a hyphen instead of an underscore are also valid aliases
+case or use a space or a hyphen instead of an underscore are also valid aliases
 because they are equivalent when normalized by
 :func:`~encodings.normalize_encoding`. For example, ``'utf-8'`` is a valid
 alias for the ``'utf_8'`` codec.
diff --git a/Lib/test/test_capi/test_codecs.py b/Lib/test/test_capi/test_codecs.py
index a0355c7a388c57..1a3f476ed0f30d 100644
--- a/Lib/test/test_capi/test_codecs.py
+++ b/Lib/test/test_capi/test_codecs.py
@@ -630,7 +630,6 @@ def test_codec_known_encoding(self):
         for name in [
             encoding_name,
             encoding_name.upper(),
-            encoding_name.replace('_', '-'),
         ]:
             with self.subTest(name):
                 self.assertTrue(_testcapi.codec_known_encoding(name))
diff --git a/Lib/test/test_codecs.py b/Lib/test/test_codecs.py
index fd7769e8c275d3..c35a4508943506 100644
--- a/Lib/test/test_codecs.py
+++ b/Lib/test/test_codecs.py
@@ -3873,26 +3873,22 @@ def test_rot13_func(self):
 class CodecNameNormalizationTest(unittest.TestCase):
     """Test codec name normalization"""
     def test_codecs_lookup(self):
-        FOUND = (1, 2, 3, 4)
-        NOT_FOUND = (None, None, None, None)
         def search_function(encoding):
-            if encoding == "aaa_8":
-                return FOUND
+            if encoding.startswith("test."):
+                return (encoding, 2, 3, 4)
             else:
-                return NOT_FOUND
+                return None
 
         codecs.register(search_function)
         self.addCleanup(codecs.unregister, search_function)
-        self.assertEqual(FOUND, codecs.lookup('aaa_8'))
-        self.assertEqual(FOUND, codecs.lookup('AAA-8'))
-        self.assertEqual(FOUND, codecs.lookup('AAA---8'))
-        self.assertEqual(FOUND, codecs.lookup('AAA   8'))
-        self.assertEqual(FOUND, codecs.lookup('aaa\xe9\u20ac-8'))
-        self.assertEqual(NOT_FOUND, codecs.lookup('AAA.8'))
-        self.assertEqual(NOT_FOUND, codecs.lookup('AAA...8'))
-        self.assertEqual(NOT_FOUND, codecs.lookup('BBB-8'))
-        self.assertEqual(NOT_FOUND, codecs.lookup('BBB.8'))
-        self.assertEqual(NOT_FOUND, codecs.lookup('a\xe9\u20ac-8'))
+        self.assertEqual(codecs.lookup('test.aaa_8'), ('test.aaa_8', 2, 3, 4))
+        self.assertEqual(codecs.lookup('TEST.AAA-8'), ('test.aaa-8', 2, 3, 4))
+        self.assertEqual(codecs.lookup('TEST.AAA 8'), ('test.aaa-8', 2, 3, 4))
+        self.assertEqual(codecs.lookup('TEST.AAA---8'), ('test.aaa---8', 2, 3, 4))
+        self.assertEqual(codecs.lookup('TEST.AAA   8'), ('test.aaa---8', 2, 3, 4))
+        self.assertEqual(codecs.lookup('TEST.AAA\xe9\u20ac-8'), ('test.aaa\xe9\u20ac-8', 2, 3, 4))
+        self.assertEqual(codecs.lookup('TEST.AAA.8'), ('test.aaa.8', 2, 3, 4))
+        self.assertEqual(codecs.lookup('TEST.AAA...8'), ('test.aaa...8', 2, 3, 4))
 
     def test_encodings_normalize_encoding(self):
         # encodings.normalize_encoding() ignores non-ASCII characters.
diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2025-07-28-17-01-05.gh-issue-88886.g4XFPb.rst b/Misc/NEWS.d/next/Core_and_Builtins/2025-07-28-17-01-05.gh-issue-88886.g4XFPb.rst
new file mode 100644
index 00000000000000..0d119efc93d20b
--- /dev/null
+++ b/Misc/NEWS.d/next/Core_and_Builtins/2025-07-28-17-01-05.gh-issue-88886.g4XFPb.rst
@@ -0,0 +1,4 @@
+The codecs lookup function now again performs only minimal normalization of
+the encoding name before passing it to the search functions: all ASCII
+letters are converted to lower case, spaces are replaced with hyphens.
+This restores the pre-Python 3.9 behavior.
diff --git a/Python/codecs.c b/Python/codecs.c
index 8eb9f2db41359e..364e07990ba42a 100644
--- a/Python/codecs.c
+++ b/Python/codecs.c
@@ -85,14 +85,15 @@ PyCodec_Unregister(PyObject *search_function)
 
 extern int _Py_normalize_encoding(const char *, char *, size_t);
 
-/* Convert a string to a normalized Python string(decoded from UTF-8): all characters are
-   converted to lower case, spaces and hyphens are replaced with underscores. */
+/* Convert a string to a normalized Python string: all ASCII letters are
+   converted to lower case, spaces are replaced with hyphens. */
 
-static
-PyObject *normalizestring(const char *string)
+static PyObject*
+normalizestring(const char *string)
 {
+    size_t i;
     size_t len = strlen(string);
-    char *encoding;
+    char *p;
     PyObject *v;
 
     if (len > PY_SSIZE_T_MAX) {
@@ -100,28 +101,30 @@ PyObject *normalizestring(const char *string)
         return NULL;
     }
 
-    encoding = PyMem_Malloc(len + 1);
-    if (encoding == NULL)
+    p = PyMem_Malloc(len + 1);
+    if (p == NULL)
         return PyErr_NoMemory();
-
-    if (!_Py_normalize_encoding(string, encoding, len + 1))
-    {
-        PyErr_SetString(PyExc_RuntimeError, "_Py_normalize_encoding() failed");
-        PyMem_Free(encoding);
-        return NULL;
-    }
-
-    v = PyUnicode_FromString(encoding);
-    PyMem_Free(encoding);
+    for (i = 0; i < len; i++) {
+        char ch = string[i];
+        if (ch == ' ')
+            ch = '-';
+        else
+            ch = Py_TOLOWER(Py_CHARMASK(ch));
+        p[i] = ch;
+    }
+    p[i] = '\0';
+    v = PyUnicode_FromString(p);
+    PyMem_Free(p);
     return v;
 }
 
 /* Lookup the given encoding and return a tuple providing the codec
    facilities.
 
-   The encoding string is looked up converted to all lower-case
-   characters. This makes encodings looked up through this mechanism
-   effectively case-insensitive.
+   ASCII letters in the encoding string is looked up converted to all
+   lower case. This makes encodings looked up through this mechanism
+   effectively case-insensitive. Spaces are replaced with hyphens for
+   names like "US ASCII" and "ISO 8859-1".
 
    If no codec is found, a LookupError is set and NULL returned.
 
@@ -142,8 +145,8 @@ PyObject *_PyCodec_Lookup(const char *encoding)
     assert(interp->codecs.initialized);
 
     /* Convert the encoding to a normalized Python string: all
-       characters are converted to lower case, spaces and hyphens are
-       replaced with underscores. */
+       ASCII letters are converted to lower case, spaces are
+       replaced with hyphens. */
     PyObject *v = normalizestring(encoding);
     if (v == NULL) {
         return NULL;

From 66ef16105a1c47d99a5f19e8ef28776c1289e8dc Mon Sep 17 00:00:00 2001
From: Samuel Sloniker <sam@kj7rrv.com>
Date: Tue, 9 Sep 2025 12:52:00 -0700
Subject: [PATCH 2/4] gh-85076: Document exceptions that can be raised by
 importlib.import_module (GH-94662)

---
 Doc/library/importlib.rst | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Doc/library/importlib.rst b/Doc/library/importlib.rst
index ddf503af82d988..7eb048fcfc28f9 100644
--- a/Doc/library/importlib.rst
+++ b/Doc/library/importlib.rst
@@ -124,6 +124,10 @@ Functions
     need to call :func:`invalidate_caches` in order for the new module to be
     noticed by the import system.
 
+    If the module cannot be imported, :func:`import_module` will raise
+    :exc:`ImportError` or an appropriate subclass like
+    :exc:`ModuleNotFoundError`.
+
     .. versionchanged:: 3.3
        Parent packages are automatically imported.
 

From 6bc65c30ff1fd0b581a2c93416496fc720bc442c Mon Sep 17 00:00:00 2001
From: sobolevn <mail@sobolevn.me>
Date: Tue, 9 Sep 2025 23:26:22 +0300
Subject: [PATCH 3/4] gh-136616: Improve `assert` syntax error messages
 (#136653)

---
 Grammar/python.gram                           |  15 +-
 Lib/test/test_syntax.py                       |  65 ++
 ...-07-14-17-01-23.gh-issue-136616.FQjXE_.rst |   2 +
 Parser/parser.c                               | 912 ++++++++++--------
 4 files changed, 594 insertions(+), 400 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Core_and_Builtins/2025-07-14-17-01-23.gh-issue-136616.FQjXE_.rst

diff --git a/Grammar/python.gram b/Grammar/python.gram
index d36d55183ce629..0d2e5940e43943 100644
--- a/Grammar/python.gram
+++ b/Grammar/python.gram
@@ -212,7 +212,9 @@ del_stmt[stmt_ty]:
 
 yield_stmt[stmt_ty]: y=yield_expr { _PyAST_Expr(y, EXTRA) }
 
-assert_stmt[stmt_ty]: 'assert' a=expression b=[',' z=expression { z }] { _PyAST_Assert(a, b, EXTRA) }
+assert_stmt[stmt_ty]:
+    | invalid_assert_stmt
+    | 'assert' a=expression b=[',' z=expression { z }] { _PyAST_Assert(a, b, EXTRA) }
 
 import_stmt[stmt_ty]:
     | invalid_import
@@ -1302,6 +1304,17 @@ invalid_raise_stmt:
 invalid_del_stmt:
     | 'del' a=star_expressions {
         RAISE_SYNTAX_ERROR_INVALID_TARGET(DEL_TARGETS, a) }
+invalid_assert_stmt:
+    | 'assert' a=expression '=' b=expression {
+        RAISE_SYNTAX_ERROR_KNOWN_RANGE(
+            a, b,
+            "cannot assign to %s here. Maybe you meant '==' instead of '='?",
+            _PyPegen_get_expr_name(a)) }
+    | 'assert' expression ',' a=expression '=' b=expression {
+        RAISE_SYNTAX_ERROR_KNOWN_RANGE(
+            a, b,
+            "cannot assign to %s here. Maybe you meant '==' instead of '='?",
+            _PyPegen_get_expr_name(a)) }
 invalid_block:
     | NEWLINE !INDENT { RAISE_INDENTATION_ERROR("expected an indented block") }
 invalid_comprehension:
diff --git a/Lib/test/test_syntax.py b/Lib/test/test_syntax.py
index c52d24219410c2..52395cd64c186a 100644
--- a/Lib/test/test_syntax.py
+++ b/Lib/test/test_syntax.py
@@ -2686,6 +2686,71 @@ def f(x: *b)
     >>> f(x = 5, *:)
     Traceback (most recent call last):
     SyntaxError: Invalid star expression
+
+Asserts:
+
+    >>> assert (a := 1)  # ok
+    >>> # TODO(@sobolevn): improve this message in the next PR
+    >>> assert a := 1
+    Traceback (most recent call last):
+    SyntaxError: invalid syntax
+
+    >>> assert 1 = 2 = 3
+    Traceback (most recent call last):
+    SyntaxError: cannot assign to literal here. Maybe you meant '==' instead of '='?
+
+    >>> assert 1 = 2
+    Traceback (most recent call last):
+    SyntaxError: cannot assign to literal here. Maybe you meant '==' instead of '='?
+
+    >>> assert (1 = 2)
+    Traceback (most recent call last):
+    SyntaxError: cannot assign to literal here. Maybe you meant '==' instead of '='?
+
+    >>> assert 'a' = a
+    Traceback (most recent call last):
+    SyntaxError: cannot assign to literal here. Maybe you meant '==' instead of '='?
+
+    >>> assert x[0] = 1
+    Traceback (most recent call last):
+    SyntaxError: cannot assign to subscript here. Maybe you meant '==' instead of '='?
+
+    >>> assert (yield a) = 2
+    Traceback (most recent call last):
+    SyntaxError: cannot assign to yield expression here. Maybe you meant '==' instead of '='?
+
+    >>> assert a = 2
+    Traceback (most recent call last):
+    SyntaxError: cannot assign to name here. Maybe you meant '==' instead of '='?
+
+    >>> assert (a = 2)
+    Traceback (most recent call last):
+    SyntaxError: invalid syntax. Maybe you meant '==' or ':=' instead of '='?
+
+    >>> assert a = b
+    Traceback (most recent call last):
+    SyntaxError: cannot assign to name here. Maybe you meant '==' instead of '='?
+
+    >>> assert 1, 1 = b
+    Traceback (most recent call last):
+    SyntaxError: cannot assign to literal here. Maybe you meant '==' instead of '='?
+
+    >>> assert 1, (1 = b)
+    Traceback (most recent call last):
+    SyntaxError: cannot assign to literal here. Maybe you meant '==' instead of '='?
+
+    >>> assert 1, a = 1
+    Traceback (most recent call last):
+    SyntaxError: cannot assign to name here. Maybe you meant '==' instead of '='?
+
+    >>> assert 1, (a = 1)
+    Traceback (most recent call last):
+    SyntaxError: invalid syntax. Maybe you meant '==' or ':=' instead of '='?
+
+    >>> assert 1 = a, a = 1
+    Traceback (most recent call last):
+    SyntaxError: cannot assign to literal here. Maybe you meant '==' instead of '='?
+
 """
 
 import re
diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2025-07-14-17-01-23.gh-issue-136616.FQjXE_.rst b/Misc/NEWS.d/next/Core_and_Builtins/2025-07-14-17-01-23.gh-issue-136616.FQjXE_.rst
new file mode 100644
index 00000000000000..0ba82548f1bb6d
--- /dev/null
+++ b/Misc/NEWS.d/next/Core_and_Builtins/2025-07-14-17-01-23.gh-issue-136616.FQjXE_.rst
@@ -0,0 +1,2 @@
+Improve :exc:`SyntaxError` error messages for invalid :keyword:`assert`
+usages.
diff --git a/Parser/parser.c b/Parser/parser.c
index c20c368a089b33..bc80cfbd542109 100644
--- a/Parser/parser.c
+++ b/Parser/parser.c
@@ -21,28 +21,28 @@ static KeywordToken *reserved_keywords[] = {
     (KeywordToken[]) {{NULL, -1}},
     (KeywordToken[]) {{NULL, -1}},
     (KeywordToken[]) {
-        {"if", 687},
-        {"as", 685},
-        {"in", 700},
+        {"if", 689},
+        {"as", 687},
+        {"in", 702},
         {"or", 589},
         {"is", 597},
         {NULL, -1},
     },
     (KeywordToken[]) {
         {"del", 630},
-        {"def", 704},
-        {"for", 699},
-        {"try", 661},
+        {"def", 706},
+        {"for", 701},
+        {"try", 663},
         {"and", 590},
-        {"not", 708},
+        {"not", 710},
         {NULL, -1},
     },
     (KeywordToken[]) {
-        {"from", 638},
+        {"from", 640},
         {"pass", 527},
-        {"with", 652},
-        {"elif", 692},
-        {"else", 691},
+        {"with", 654},
+        {"elif", 694},
+        {"else", 693},
         {"None", 624},
         {"True", 623},
         {NULL, -1},
@@ -51,24 +51,24 @@ static KeywordToken *reserved_keywords[] = {
         {"raise", 628},
         {"yield", 588},
         {"break", 528},
-        {"async", 703},
-        {"class", 706},
-        {"while", 694},
+        {"async", 705},
+        {"class", 708},
+        {"while", 696},
         {"False", 625},
         {"await", 598},
         {NULL, -1},
     },
     (KeywordToken[]) {
         {"return", 522},
-        {"import", 639},
-        {"assert", 533},
+        {"import", 641},
+        {"assert", 632},
         {"global", 530},
-        {"except", 682},
+        {"except", 684},
         {"lambda", 622},
         {NULL, -1},
     },
     (KeywordToken[]) {
-        {"finally", 678},
+        {"finally", 680},
         {NULL, -1},
     },
     (KeywordToken[]) {
@@ -300,235 +300,236 @@ static char *soft_keywords[] = {
 #define invalid_ann_assign_target_type 1213
 #define invalid_raise_stmt_type 1214
 #define invalid_del_stmt_type 1215
-#define invalid_block_type 1216
-#define invalid_comprehension_type 1217
-#define invalid_dict_comprehension_type 1218
-#define invalid_parameters_type 1219
-#define invalid_default_type 1220
-#define invalid_star_etc_type 1221
-#define invalid_kwds_type 1222
-#define invalid_parameters_helper_type 1223
-#define invalid_lambda_parameters_type 1224
-#define invalid_lambda_parameters_helper_type 1225
-#define invalid_lambda_star_etc_type 1226
-#define invalid_lambda_kwds_type 1227
-#define invalid_double_type_comments_type 1228
-#define invalid_with_item_type 1229
-#define invalid_for_if_clause_type 1230
-#define invalid_for_target_type 1231
-#define invalid_group_type 1232
-#define invalid_import_type 1233
-#define invalid_dotted_as_name_type 1234
-#define invalid_import_from_as_name_type 1235
-#define invalid_import_from_targets_type 1236
-#define invalid_with_stmt_type 1237
-#define invalid_with_stmt_indent_type 1238
-#define invalid_try_stmt_type 1239
-#define invalid_except_stmt_type 1240
-#define invalid_except_star_stmt_type 1241
-#define invalid_finally_stmt_type 1242
-#define invalid_except_stmt_indent_type 1243
-#define invalid_except_star_stmt_indent_type 1244
-#define invalid_match_stmt_type 1245
-#define invalid_case_block_type 1246
-#define invalid_as_pattern_type 1247
-#define invalid_class_pattern_type 1248
-#define invalid_class_argument_pattern_type 1249
-#define invalid_if_stmt_type 1250
-#define invalid_elif_stmt_type 1251
-#define invalid_else_stmt_type 1252
-#define invalid_while_stmt_type 1253
-#define invalid_for_stmt_type 1254
-#define invalid_def_raw_type 1255
-#define invalid_class_def_raw_type 1256
-#define invalid_double_starred_kvpairs_type 1257
-#define invalid_kvpair_type 1258
-#define invalid_starred_expression_unpacking_type 1259
-#define invalid_starred_expression_type 1260
-#define invalid_fstring_replacement_field_type 1261
-#define invalid_fstring_conversion_character_type 1262
-#define invalid_tstring_replacement_field_type 1263
-#define invalid_tstring_conversion_character_type 1264
-#define invalid_string_tstring_concat_type 1265
-#define invalid_arithmetic_type 1266
-#define invalid_factor_type 1267
-#define invalid_type_params_type 1268
-#define _loop0_1_type 1269
-#define _loop1_2_type 1270
-#define _loop0_3_type 1271
-#define _gather_4_type 1272
-#define _tmp_5_type 1273
-#define _tmp_6_type 1274
-#define _tmp_7_type 1275
-#define _tmp_8_type 1276
-#define _tmp_9_type 1277
-#define _tmp_10_type 1278
-#define _tmp_11_type 1279
-#define _loop1_12_type 1280
-#define _loop0_13_type 1281
-#define _gather_14_type 1282
-#define _tmp_15_type 1283
-#define _tmp_16_type 1284
-#define _loop0_17_type 1285
-#define _loop1_18_type 1286
-#define _loop0_19_type 1287
-#define _gather_20_type 1288
-#define _tmp_21_type 1289
-#define _loop0_22_type 1290
-#define _gather_23_type 1291
-#define _loop1_24_type 1292
-#define _tmp_25_type 1293
-#define _tmp_26_type 1294
-#define _loop0_27_type 1295
-#define _loop0_28_type 1296
-#define _loop1_29_type 1297
-#define _loop1_30_type 1298
-#define _loop0_31_type 1299
-#define _loop1_32_type 1300
-#define _loop0_33_type 1301
-#define _gather_34_type 1302
-#define _tmp_35_type 1303
-#define _loop1_36_type 1304
-#define _loop1_37_type 1305
-#define _loop1_38_type 1306
-#define _loop0_39_type 1307
-#define _gather_40_type 1308
-#define _tmp_41_type 1309
-#define _tmp_42_type 1310
-#define _tmp_43_type 1311
-#define _loop0_44_type 1312
-#define _gather_45_type 1313
-#define _loop0_46_type 1314
-#define _gather_47_type 1315
-#define _tmp_48_type 1316
-#define _loop0_49_type 1317
-#define _gather_50_type 1318
-#define _loop0_51_type 1319
-#define _gather_52_type 1320
-#define _loop0_53_type 1321
-#define _gather_54_type 1322
-#define _loop1_55_type 1323
-#define _loop1_56_type 1324
-#define _loop0_57_type 1325
-#define _gather_58_type 1326
-#define _loop1_59_type 1327
-#define _loop1_60_type 1328
-#define _loop1_61_type 1329
-#define _tmp_62_type 1330
-#define _loop0_63_type 1331
-#define _gather_64_type 1332
-#define _tmp_65_type 1333
-#define _tmp_66_type 1334
-#define _tmp_67_type 1335
-#define _tmp_68_type 1336
-#define _tmp_69_type 1337
-#define _loop0_70_type 1338
-#define _loop0_71_type 1339
-#define _loop1_72_type 1340
-#define _loop1_73_type 1341
-#define _loop0_74_type 1342
-#define _loop1_75_type 1343
-#define _loop0_76_type 1344
-#define _loop0_77_type 1345
-#define _loop0_78_type 1346
-#define _loop0_79_type 1347
-#define _loop1_80_type 1348
-#define _loop1_81_type 1349
-#define _tmp_82_type 1350
-#define _loop0_83_type 1351
-#define _gather_84_type 1352
-#define _loop1_85_type 1353
-#define _loop0_86_type 1354
-#define _tmp_87_type 1355
-#define _loop0_88_type 1356
-#define _gather_89_type 1357
-#define _tmp_90_type 1358
-#define _loop0_91_type 1359
-#define _gather_92_type 1360
-#define _loop0_93_type 1361
-#define _gather_94_type 1362
-#define _loop0_95_type 1363
-#define _loop0_96_type 1364
-#define _gather_97_type 1365
-#define _loop1_98_type 1366
-#define _tmp_99_type 1367
-#define _loop0_100_type 1368
-#define _gather_101_type 1369
-#define _loop0_102_type 1370
-#define _gather_103_type 1371
-#define _tmp_104_type 1372
-#define _tmp_105_type 1373
-#define _loop0_106_type 1374
-#define _gather_107_type 1375
-#define _tmp_108_type 1376
-#define _tmp_109_type 1377
-#define _tmp_110_type 1378
-#define _tmp_111_type 1379
-#define _tmp_112_type 1380
-#define _loop1_113_type 1381
-#define _tmp_114_type 1382
-#define _tmp_115_type 1383
-#define _tmp_116_type 1384
-#define _tmp_117_type 1385
-#define _tmp_118_type 1386
-#define _loop0_119_type 1387
-#define _loop0_120_type 1388
-#define _tmp_121_type 1389
-#define _tmp_122_type 1390
-#define _tmp_123_type 1391
-#define _tmp_124_type 1392
-#define _tmp_125_type 1393
-#define _tmp_126_type 1394
-#define _tmp_127_type 1395
-#define _tmp_128_type 1396
-#define _tmp_129_type 1397
-#define _loop0_130_type 1398
-#define _gather_131_type 1399
-#define _tmp_132_type 1400
-#define _tmp_133_type 1401
-#define _tmp_134_type 1402
-#define _tmp_135_type 1403
-#define _loop0_136_type 1404
-#define _gather_137_type 1405
-#define _tmp_138_type 1406
-#define _loop0_139_type 1407
-#define _gather_140_type 1408
-#define _loop0_141_type 1409
-#define _gather_142_type 1410
-#define _tmp_143_type 1411
-#define _loop0_144_type 1412
-#define _tmp_145_type 1413
-#define _tmp_146_type 1414
-#define _tmp_147_type 1415
-#define _tmp_148_type 1416
-#define _tmp_149_type 1417
-#define _tmp_150_type 1418
-#define _tmp_151_type 1419
-#define _tmp_152_type 1420
-#define _tmp_153_type 1421
-#define _tmp_154_type 1422
-#define _tmp_155_type 1423
-#define _tmp_156_type 1424
-#define _tmp_157_type 1425
-#define _tmp_158_type 1426
-#define _tmp_159_type 1427
-#define _tmp_160_type 1428
-#define _tmp_161_type 1429
-#define _tmp_162_type 1430
-#define _tmp_163_type 1431
-#define _tmp_164_type 1432
-#define _tmp_165_type 1433
-#define _tmp_166_type 1434
-#define _tmp_167_type 1435
-#define _tmp_168_type 1436
-#define _tmp_169_type 1437
-#define _tmp_170_type 1438
-#define _loop0_171_type 1439
-#define _tmp_172_type 1440
-#define _tmp_173_type 1441
-#define _tmp_174_type 1442
-#define _tmp_175_type 1443
-#define _tmp_176_type 1444
+#define invalid_assert_stmt_type 1216
+#define invalid_block_type 1217
+#define invalid_comprehension_type 1218
+#define invalid_dict_comprehension_type 1219
+#define invalid_parameters_type 1220
+#define invalid_default_type 1221
+#define invalid_star_etc_type 1222
+#define invalid_kwds_type 1223
+#define invalid_parameters_helper_type 1224
+#define invalid_lambda_parameters_type 1225
+#define invalid_lambda_parameters_helper_type 1226
+#define invalid_lambda_star_etc_type 1227
+#define invalid_lambda_kwds_type 1228
+#define invalid_double_type_comments_type 1229
+#define invalid_with_item_type 1230
+#define invalid_for_if_clause_type 1231
+#define invalid_for_target_type 1232
+#define invalid_group_type 1233
+#define invalid_import_type 1234
+#define invalid_dotted_as_name_type 1235
+#define invalid_import_from_as_name_type 1236
+#define invalid_import_from_targets_type 1237
+#define invalid_with_stmt_type 1238
+#define invalid_with_stmt_indent_type 1239
+#define invalid_try_stmt_type 1240
+#define invalid_except_stmt_type 1241
+#define invalid_except_star_stmt_type 1242
+#define invalid_finally_stmt_type 1243
+#define invalid_except_stmt_indent_type 1244
+#define invalid_except_star_stmt_indent_type 1245
+#define invalid_match_stmt_type 1246
+#define invalid_case_block_type 1247
+#define invalid_as_pattern_type 1248
+#define invalid_class_pattern_type 1249
+#define invalid_class_argument_pattern_type 1250
+#define invalid_if_stmt_type 1251
+#define invalid_elif_stmt_type 1252
+#define invalid_else_stmt_type 1253
+#define invalid_while_stmt_type 1254
+#define invalid_for_stmt_type 1255
+#define invalid_def_raw_type 1256
+#define invalid_class_def_raw_type 1257
+#define invalid_double_starred_kvpairs_type 1258
+#define invalid_kvpair_type 1259
+#define invalid_starred_expression_unpacking_type 1260
+#define invalid_starred_expression_type 1261
+#define invalid_fstring_replacement_field_type 1262
+#define invalid_fstring_conversion_character_type 1263
+#define invalid_tstring_replacement_field_type 1264
+#define invalid_tstring_conversion_character_type 1265
+#define invalid_string_tstring_concat_type 1266
+#define invalid_arithmetic_type 1267
+#define invalid_factor_type 1268
+#define invalid_type_params_type 1269
+#define _loop0_1_type 1270
+#define _loop1_2_type 1271
+#define _loop0_3_type 1272
+#define _gather_4_type 1273
+#define _tmp_5_type 1274
+#define _tmp_6_type 1275
+#define _tmp_7_type 1276
+#define _tmp_8_type 1277
+#define _tmp_9_type 1278
+#define _tmp_10_type 1279
+#define _tmp_11_type 1280
+#define _loop1_12_type 1281
+#define _loop0_13_type 1282
+#define _gather_14_type 1283
+#define _tmp_15_type 1284
+#define _tmp_16_type 1285
+#define _loop0_17_type 1286
+#define _loop1_18_type 1287
+#define _loop0_19_type 1288
+#define _gather_20_type 1289
+#define _tmp_21_type 1290
+#define _loop0_22_type 1291
+#define _gather_23_type 1292
+#define _loop1_24_type 1293
+#define _tmp_25_type 1294
+#define _tmp_26_type 1295
+#define _loop0_27_type 1296
+#define _loop0_28_type 1297
+#define _loop1_29_type 1298
+#define _loop1_30_type 1299
+#define _loop0_31_type 1300
+#define _loop1_32_type 1301
+#define _loop0_33_type 1302
+#define _gather_34_type 1303
+#define _tmp_35_type 1304
+#define _loop1_36_type 1305
+#define _loop1_37_type 1306
+#define _loop1_38_type 1307
+#define _loop0_39_type 1308
+#define _gather_40_type 1309
+#define _tmp_41_type 1310
+#define _tmp_42_type 1311
+#define _tmp_43_type 1312
+#define _loop0_44_type 1313
+#define _gather_45_type 1314
+#define _loop0_46_type 1315
+#define _gather_47_type 1316
+#define _tmp_48_type 1317
+#define _loop0_49_type 1318
+#define _gather_50_type 1319
+#define _loop0_51_type 1320
+#define _gather_52_type 1321
+#define _loop0_53_type 1322
+#define _gather_54_type 1323
+#define _loop1_55_type 1324
+#define _loop1_56_type 1325
+#define _loop0_57_type 1326
+#define _gather_58_type 1327
+#define _loop1_59_type 1328
+#define _loop1_60_type 1329
+#define _loop1_61_type 1330
+#define _tmp_62_type 1331
+#define _loop0_63_type 1332
+#define _gather_64_type 1333
+#define _tmp_65_type 1334
+#define _tmp_66_type 1335
+#define _tmp_67_type 1336
+#define _tmp_68_type 1337
+#define _tmp_69_type 1338
+#define _loop0_70_type 1339
+#define _loop0_71_type 1340
+#define _loop1_72_type 1341
+#define _loop1_73_type 1342
+#define _loop0_74_type 1343
+#define _loop1_75_type 1344
+#define _loop0_76_type 1345
+#define _loop0_77_type 1346
+#define _loop0_78_type 1347
+#define _loop0_79_type 1348
+#define _loop1_80_type 1349
+#define _loop1_81_type 1350
+#define _tmp_82_type 1351
+#define _loop0_83_type 1352
+#define _gather_84_type 1353
+#define _loop1_85_type 1354
+#define _loop0_86_type 1355
+#define _tmp_87_type 1356
+#define _loop0_88_type 1357
+#define _gather_89_type 1358
+#define _tmp_90_type 1359
+#define _loop0_91_type 1360
+#define _gather_92_type 1361
+#define _loop0_93_type 1362
+#define _gather_94_type 1363
+#define _loop0_95_type 1364
+#define _loop0_96_type 1365
+#define _gather_97_type 1366
+#define _loop1_98_type 1367
+#define _tmp_99_type 1368
+#define _loop0_100_type 1369
+#define _gather_101_type 1370
+#define _loop0_102_type 1371
+#define _gather_103_type 1372
+#define _tmp_104_type 1373
+#define _tmp_105_type 1374
+#define _loop0_106_type 1375
+#define _gather_107_type 1376
+#define _tmp_108_type 1377
+#define _tmp_109_type 1378
+#define _tmp_110_type 1379
+#define _tmp_111_type 1380
+#define _tmp_112_type 1381
+#define _loop1_113_type 1382
+#define _tmp_114_type 1383
+#define _tmp_115_type 1384
+#define _tmp_116_type 1385
+#define _tmp_117_type 1386
+#define _tmp_118_type 1387
+#define _loop0_119_type 1388
+#define _loop0_120_type 1389
+#define _tmp_121_type 1390
+#define _tmp_122_type 1391
+#define _tmp_123_type 1392
+#define _tmp_124_type 1393
+#define _tmp_125_type 1394
+#define _tmp_126_type 1395
+#define _tmp_127_type 1396
+#define _tmp_128_type 1397
+#define _tmp_129_type 1398
+#define _loop0_130_type 1399
+#define _gather_131_type 1400
+#define _tmp_132_type 1401
+#define _tmp_133_type 1402
+#define _tmp_134_type 1403
+#define _tmp_135_type 1404
+#define _loop0_136_type 1405
+#define _gather_137_type 1406
+#define _tmp_138_type 1407
+#define _loop0_139_type 1408
+#define _gather_140_type 1409
+#define _loop0_141_type 1410
+#define _gather_142_type 1411
+#define _tmp_143_type 1412
+#define _loop0_144_type 1413
+#define _tmp_145_type 1414
+#define _tmp_146_type 1415
+#define _tmp_147_type 1416
+#define _tmp_148_type 1417
+#define _tmp_149_type 1418
+#define _tmp_150_type 1419
+#define _tmp_151_type 1420
+#define _tmp_152_type 1421
+#define _tmp_153_type 1422
+#define _tmp_154_type 1423
+#define _tmp_155_type 1424
+#define _tmp_156_type 1425
+#define _tmp_157_type 1426
+#define _tmp_158_type 1427
+#define _tmp_159_type 1428
+#define _tmp_160_type 1429
+#define _tmp_161_type 1430
+#define _tmp_162_type 1431
+#define _tmp_163_type 1432
+#define _tmp_164_type 1433
+#define _tmp_165_type 1434
+#define _tmp_166_type 1435
+#define _tmp_167_type 1436
+#define _tmp_168_type 1437
+#define _tmp_169_type 1438
+#define _tmp_170_type 1439
+#define _loop0_171_type 1440
+#define _tmp_172_type 1441
+#define _tmp_173_type 1442
+#define _tmp_174_type 1443
+#define _tmp_175_type 1444
+#define _tmp_176_type 1445
 
 static mod_ty file_rule(Parser *p);
 static mod_ty interactive_rule(Parser *p);
@@ -746,6 +747,7 @@ static void *invalid_assignment_rule(Parser *p);
 static expr_ty invalid_ann_assign_target_rule(Parser *p);
 static void *invalid_raise_stmt_rule(Parser *p);
 static void *invalid_del_stmt_rule(Parser *p);
+static void *invalid_assert_stmt_rule(Parser *p);
 static void *invalid_block_rule(Parser *p);
 static void *invalid_comprehension_rule(Parser *p);
 static void *invalid_dict_comprehension_rule(Parser *p);
@@ -1786,7 +1788,7 @@ simple_stmt_rule(Parser *p)
         D(fprintf(stderr, "%*c> simple_stmt[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "&'assert' assert_stmt"));
         stmt_ty assert_stmt_var;
         if (
-            _PyPegen_lookahead_with_int(1, _PyPegen_expect_token, p, 533)  // token='assert'
+            _PyPegen_lookahead_with_int(1, _PyPegen_expect_token, p, 632)  // token='assert'
             &&
             (assert_stmt_var = assert_stmt_rule(p))  // assert_stmt
         )
@@ -1940,7 +1942,7 @@ compound_stmt_rule(Parser *p)
         D(fprintf(stderr, "%*c> compound_stmt[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "&'if' if_stmt"));
         stmt_ty if_stmt_var;
         if (
-            _PyPegen_lookahead_with_int(1, _PyPegen_expect_token, p, 687)  // token='if'
+            _PyPegen_lookahead_with_int(1, _PyPegen_expect_token, p, 689)  // token='if'
             &&
             (if_stmt_var = if_stmt_rule(p))  // if_stmt
         )
@@ -2024,7 +2026,7 @@ compound_stmt_rule(Parser *p)
         D(fprintf(stderr, "%*c> compound_stmt[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "&'try' try_stmt"));
         stmt_ty try_stmt_var;
         if (
-            _PyPegen_lookahead_with_int(1, _PyPegen_expect_token, p, 661)  // token='try'
+            _PyPegen_lookahead_with_int(1, _PyPegen_expect_token, p, 663)  // token='try'
             &&
             (try_stmt_var = try_stmt_rule(p))  // try_stmt
         )
@@ -2045,7 +2047,7 @@ compound_stmt_rule(Parser *p)
         D(fprintf(stderr, "%*c> compound_stmt[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "&'while' while_stmt"));
         stmt_ty while_stmt_var;
         if (
-            _PyPegen_lookahead_with_int(1, _PyPegen_expect_token, p, 694)  // token='while'
+            _PyPegen_lookahead_with_int(1, _PyPegen_expect_token, p, 696)  // token='while'
             &&
             (while_stmt_var = while_stmt_rule(p))  // while_stmt
         )
@@ -2812,7 +2814,7 @@ raise_stmt_rule(Parser *p)
             &&
             (a = expression_rule(p))  // expression
             &&
-            (_keyword_1 = _PyPegen_expect_token(p, 638))  // token='from'
+            (_keyword_1 = _PyPegen_expect_token(p, 640))  // token='from'
             &&
             (b = expression_rule(p))  // expression
         )
@@ -3390,7 +3392,7 @@ yield_stmt_rule(Parser *p)
     return _res;
 }
 
-// assert_stmt: 'assert' expression [',' expression]
+// assert_stmt: invalid_assert_stmt | 'assert' expression [',' expression]
 static stmt_ty
 assert_stmt_rule(Parser *p)
 {
@@ -3412,6 +3414,25 @@ assert_stmt_rule(Parser *p)
     UNUSED(_start_lineno); // Only used by EXTRA macro
     int _start_col_offset = p->tokens[_mark]->col_offset;
     UNUSED(_start_col_offset); // Only used by EXTRA macro
+    if (p->call_invalid_rules) { // invalid_assert_stmt
+        if (p->error_indicator) {
+            p->level--;
+            return NULL;
+        }
+        D(fprintf(stderr, "%*c> assert_stmt[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "invalid_assert_stmt"));
+        void *invalid_assert_stmt_var;
+        if (
+            (invalid_assert_stmt_var = invalid_assert_stmt_rule(p))  // invalid_assert_stmt
+        )
+        {
+            D(fprintf(stderr, "%*c+ assert_stmt[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "invalid_assert_stmt"));
+            _res = invalid_assert_stmt_var;
+            goto done;
+        }
+        p->mark = _mark;
+        D(fprintf(stderr, "%*c%s assert_stmt[%d-%d]: %s failed!\n", p->level, ' ',
+                  p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "invalid_assert_stmt"));
+    }
     { // 'assert' expression [',' expression]
         if (p->error_indicator) {
             p->level--;
@@ -3422,7 +3443,7 @@ assert_stmt_rule(Parser *p)
         expr_ty a;
         void *b;
         if (
-            (_keyword = _PyPegen_expect_token(p, 533))  // token='assert'
+            (_keyword = _PyPegen_expect_token(p, 632))  // token='assert'
             &&
             (a = expression_rule(p))  // expression
             &&
@@ -3564,7 +3585,7 @@ import_name_rule(Parser *p)
         Token * _keyword;
         asdl_alias_seq* a;
         if (
-            (_keyword = _PyPegen_expect_token(p, 639))  // token='import'
+            (_keyword = _PyPegen_expect_token(p, 641))  // token='import'
             &&
             (a = dotted_as_names_rule(p))  // dotted_as_names
         )
@@ -3633,13 +3654,13 @@ import_from_rule(Parser *p)
         expr_ty b;
         asdl_alias_seq* c;
         if (
-            (_keyword = _PyPegen_expect_token(p, 638))  // token='from'
+            (_keyword = _PyPegen_expect_token(p, 640))  // token='from'
             &&
             (a = _loop0_17_rule(p))  // (('.' | '...'))*
             &&
             (b = dotted_name_rule(p))  // dotted_name
             &&
-            (_keyword_1 = _PyPegen_expect_token(p, 639))  // token='import'
+            (_keyword_1 = _PyPegen_expect_token(p, 641))  // token='import'
             &&
             (c = import_from_targets_rule(p))  // import_from_targets
         )
@@ -3677,11 +3698,11 @@ import_from_rule(Parser *p)
         asdl_seq * a;
         asdl_alias_seq* b;
         if (
-            (_keyword = _PyPegen_expect_token(p, 638))  // token='from'
+            (_keyword = _PyPegen_expect_token(p, 640))  // token='from'
             &&
             (a = _loop1_18_rule(p))  // (('.' | '...'))+
             &&
-            (_keyword_1 = _PyPegen_expect_token(p, 639))  // token='import'
+            (_keyword_1 = _PyPegen_expect_token(p, 641))  // token='import'
             &&
             (b = import_from_targets_rule(p))  // import_from_targets
         )
@@ -4468,7 +4489,7 @@ class_def_raw_rule(Parser *p)
         asdl_stmt_seq* c;
         void *t;
         if (
-            (_keyword = _PyPegen_expect_token(p, 706))  // token='class'
+            (_keyword = _PyPegen_expect_token(p, 708))  // token='class'
             &&
             (a = _PyPegen_name_token(p))  // NAME
             &&
@@ -4635,7 +4656,7 @@ function_def_raw_rule(Parser *p)
         void *t;
         void *tc;
         if (
-            (_keyword = _PyPegen_expect_token(p, 704))  // token='def'
+            (_keyword = _PyPegen_expect_token(p, 706))  // token='def'
             &&
             (n = _PyPegen_name_token(p))  // NAME
             &&
@@ -4696,9 +4717,9 @@ function_def_raw_rule(Parser *p)
         void *t;
         void *tc;
         if (
-            (_keyword = _PyPegen_expect_token(p, 703))  // token='async'
+            (_keyword = _PyPegen_expect_token(p, 705))  // token='async'
             &&
-            (_keyword_1 = _PyPegen_expect_token(p, 704))  // token='def'
+            (_keyword_1 = _PyPegen_expect_token(p, 706))  // token='def'
             &&
             (n = _PyPegen_name_token(p))  // NAME
             &&
@@ -6036,7 +6057,7 @@ if_stmt_rule(Parser *p)
         asdl_stmt_seq* b;
         stmt_ty c;
         if (
-            (_keyword = _PyPegen_expect_token(p, 687))  // token='if'
+            (_keyword = _PyPegen_expect_token(p, 689))  // token='if'
             &&
             (a = named_expression_rule(p))  // named_expression
             &&
@@ -6081,7 +6102,7 @@ if_stmt_rule(Parser *p)
         asdl_stmt_seq* b;
         void *c;
         if (
-            (_keyword = _PyPegen_expect_token(p, 687))  // token='if'
+            (_keyword = _PyPegen_expect_token(p, 689))  // token='if'
             &&
             (a = named_expression_rule(p))  // named_expression
             &&
@@ -6176,7 +6197,7 @@ elif_stmt_rule(Parser *p)
         asdl_stmt_seq* b;
         stmt_ty c;
         if (
-            (_keyword = _PyPegen_expect_token(p, 692))  // token='elif'
+            (_keyword = _PyPegen_expect_token(p, 694))  // token='elif'
             &&
             (a = named_expression_rule(p))  // named_expression
             &&
@@ -6221,7 +6242,7 @@ elif_stmt_rule(Parser *p)
         asdl_stmt_seq* b;
         void *c;
         if (
-            (_keyword = _PyPegen_expect_token(p, 692))  // token='elif'
+            (_keyword = _PyPegen_expect_token(p, 694))  // token='elif'
             &&
             (a = named_expression_rule(p))  // named_expression
             &&
@@ -6302,7 +6323,7 @@ else_block_rule(Parser *p)
         Token * _literal;
         asdl_stmt_seq* b;
         if (
-            (_keyword = _PyPegen_expect_token(p, 691))  // token='else'
+            (_keyword = _PyPegen_expect_token(p, 693))  // token='else'
             &&
             (_literal = _PyPegen_expect_forced_token(p, 11, ":"))  // forced_token=':'
             &&
@@ -6381,7 +6402,7 @@ while_stmt_rule(Parser *p)
         asdl_stmt_seq* b;
         void *c;
         if (
-            (_keyword = _PyPegen_expect_token(p, 694))  // token='while'
+            (_keyword = _PyPegen_expect_token(p, 696))  // token='while'
             &&
             (a = named_expression_rule(p))  // named_expression
             &&
@@ -6481,11 +6502,11 @@ for_stmt_rule(Parser *p)
         expr_ty t;
         void *tc;
         if (
-            (_keyword = _PyPegen_expect_token(p, 699))  // token='for'
+            (_keyword = _PyPegen_expect_token(p, 701))  // token='for'
             &&
             (t = star_targets_rule(p))  // star_targets
             &&
-            (_keyword_1 = _PyPegen_expect_token(p, 700))  // token='in'
+            (_keyword_1 = _PyPegen_expect_token(p, 702))  // token='in'
             &&
             (_cut_var = 1)
             &&
@@ -6543,13 +6564,13 @@ for_stmt_rule(Parser *p)
         expr_ty t;
         void *tc;
         if (
-            (_keyword = _PyPegen_expect_token(p, 703))  // token='async'
+            (_keyword = _PyPegen_expect_token(p, 705))  // token='async'
             &&
-            (_keyword_1 = _PyPegen_expect_token(p, 699))  // token='for'
+            (_keyword_1 = _PyPegen_expect_token(p, 701))  // token='for'
             &&
             (t = star_targets_rule(p))  // star_targets
             &&
-            (_keyword_2 = _PyPegen_expect_token(p, 700))  // token='in'
+            (_keyword_2 = _PyPegen_expect_token(p, 702))  // token='in'
             &&
             (_cut_var = 1)
             &&
@@ -6678,7 +6699,7 @@ with_stmt_rule(Parser *p)
         asdl_stmt_seq* b;
         void *tc;
         if (
-            (_keyword = _PyPegen_expect_token(p, 652))  // token='with'
+            (_keyword = _PyPegen_expect_token(p, 654))  // token='with'
             &&
             (_literal = _PyPegen_expect_token(p, 7))  // token='('
             &&
@@ -6729,7 +6750,7 @@ with_stmt_rule(Parser *p)
         asdl_stmt_seq* b;
         void *tc;
         if (
-            (_keyword = _PyPegen_expect_token(p, 652))  // token='with'
+            (_keyword = _PyPegen_expect_token(p, 654))  // token='with'
             &&
             (a = (asdl_withitem_seq*)_gather_34_rule(p))  // ','.with_item+
             &&
@@ -6778,9 +6799,9 @@ with_stmt_rule(Parser *p)
         asdl_withitem_seq* a;
         asdl_stmt_seq* b;
         if (
-            (_keyword = _PyPegen_expect_token(p, 703))  // token='async'
+            (_keyword = _PyPegen_expect_token(p, 705))  // token='async'
             &&
-            (_keyword_1 = _PyPegen_expect_token(p, 652))  // token='with'
+            (_keyword_1 = _PyPegen_expect_token(p, 654))  // token='with'
             &&
             (_literal = _PyPegen_expect_token(p, 7))  // token='('
             &&
@@ -6830,9 +6851,9 @@ with_stmt_rule(Parser *p)
         asdl_stmt_seq* b;
         void *tc;
         if (
-            (_keyword = _PyPegen_expect_token(p, 703))  // token='async'
+            (_keyword = _PyPegen_expect_token(p, 705))  // token='async'
             &&
-            (_keyword_1 = _PyPegen_expect_token(p, 652))  // token='with'
+            (_keyword_1 = _PyPegen_expect_token(p, 654))  // token='with'
             &&
             (a = (asdl_withitem_seq*)_gather_34_rule(p))  // ','.with_item+
             &&
@@ -6918,7 +6939,7 @@ with_item_rule(Parser *p)
         if (
             (e = expression_rule(p))  // expression
             &&
-            (_keyword = _PyPegen_expect_token(p, 685))  // token='as'
+            (_keyword = _PyPegen_expect_token(p, 687))  // token='as'
             &&
             (t = star_target_rule(p))  // star_target
             &&
@@ -7043,7 +7064,7 @@ try_stmt_rule(Parser *p)
         asdl_stmt_seq* b;
         asdl_stmt_seq* f;
         if (
-            (_keyword = _PyPegen_expect_token(p, 661))  // token='try'
+            (_keyword = _PyPegen_expect_token(p, 663))  // token='try'
             &&
             (_literal = _PyPegen_expect_forced_token(p, 11, ":"))  // forced_token=':'
             &&
@@ -7087,7 +7108,7 @@ try_stmt_rule(Parser *p)
         asdl_excepthandler_seq* ex;
         void *f;
         if (
-            (_keyword = _PyPegen_expect_token(p, 661))  // token='try'
+            (_keyword = _PyPegen_expect_token(p, 663))  // token='try'
             &&
             (_literal = _PyPegen_expect_forced_token(p, 11, ":"))  // forced_token=':'
             &&
@@ -7135,7 +7156,7 @@ try_stmt_rule(Parser *p)
         asdl_excepthandler_seq* ex;
         void *f;
         if (
-            (_keyword = _PyPegen_expect_token(p, 661))  // token='try'
+            (_keyword = _PyPegen_expect_token(p, 663))  // token='try'
             &&
             (_literal = _PyPegen_expect_forced_token(p, 11, ":"))  // forced_token=':'
             &&
@@ -7234,7 +7255,7 @@ except_block_rule(Parser *p)
         asdl_stmt_seq* b;
         expr_ty e;
         if (
-            (_keyword = _PyPegen_expect_token(p, 682))  // token='except'
+            (_keyword = _PyPegen_expect_token(p, 684))  // token='except'
             &&
             (e = expression_rule(p))  // expression
             &&
@@ -7278,11 +7299,11 @@ except_block_rule(Parser *p)
         expr_ty e;
         expr_ty t;
         if (
-            (_keyword = _PyPegen_expect_token(p, 682))  // token='except'
+            (_keyword = _PyPegen_expect_token(p, 684))  // token='except'
             &&
             (e = expression_rule(p))  // expression
             &&
-            (_keyword_1 = _PyPegen_expect_token(p, 685))  // token='as'
+            (_keyword_1 = _PyPegen_expect_token(p, 687))  // token='as'
             &&
             (t = _PyPegen_name_token(p))  // NAME
             &&
@@ -7324,7 +7345,7 @@ except_block_rule(Parser *p)
         asdl_stmt_seq* b;
         expr_ty e;
         if (
-            (_keyword = _PyPegen_expect_token(p, 682))  // token='except'
+            (_keyword = _PyPegen_expect_token(p, 684))  // token='except'
             &&
             (e = expressions_rule(p))  // expressions
             &&
@@ -7365,7 +7386,7 @@ except_block_rule(Parser *p)
         Token * _literal;
         asdl_stmt_seq* b;
         if (
-            (_keyword = _PyPegen_expect_token(p, 682))  // token='except'
+            (_keyword = _PyPegen_expect_token(p, 684))  // token='except'
             &&
             (_literal = _PyPegen_expect_token(p, 11))  // token=':'
             &&
@@ -7477,7 +7498,7 @@ except_star_block_rule(Parser *p)
         asdl_stmt_seq* b;
         expr_ty e;
         if (
-            (_keyword = _PyPegen_expect_token(p, 682))  // token='except'
+            (_keyword = _PyPegen_expect_token(p, 684))  // token='except'
             &&
             (_literal = _PyPegen_expect_token(p, 16))  // token='*'
             &&
@@ -7524,13 +7545,13 @@ except_star_block_rule(Parser *p)
         expr_ty e;
         expr_ty t;
         if (
-            (_keyword = _PyPegen_expect_token(p, 682))  // token='except'
+            (_keyword = _PyPegen_expect_token(p, 684))  // token='except'
             &&
             (_literal = _PyPegen_expect_token(p, 16))  // token='*'
             &&
             (e = expression_rule(p))  // expression
             &&
-            (_keyword_1 = _PyPegen_expect_token(p, 685))  // token='as'
+            (_keyword_1 = _PyPegen_expect_token(p, 687))  // token='as'
             &&
             (t = _PyPegen_name_token(p))  // NAME
             &&
@@ -7573,7 +7594,7 @@ except_star_block_rule(Parser *p)
         asdl_stmt_seq* b;
         expr_ty e;
         if (
-            (_keyword = _PyPegen_expect_token(p, 682))  // token='except'
+            (_keyword = _PyPegen_expect_token(p, 684))  // token='except'
             &&
             (_literal = _PyPegen_expect_token(p, 16))  // token='*'
             &&
@@ -7673,7 +7694,7 @@ finally_block_rule(Parser *p)
         Token * _literal;
         asdl_stmt_seq* a;
         if (
-            (_keyword = _PyPegen_expect_token(p, 678))  // token='finally'
+            (_keyword = _PyPegen_expect_token(p, 680))  // token='finally'
             &&
             (_literal = _PyPegen_expect_forced_token(p, 11, ":"))  // forced_token=':'
             &&
@@ -7981,7 +8002,7 @@ guard_rule(Parser *p)
         Token * _keyword;
         expr_ty guard;
         if (
-            (_keyword = _PyPegen_expect_token(p, 687))  // token='if'
+            (_keyword = _PyPegen_expect_token(p, 689))  // token='if'
             &&
             (guard = named_expression_rule(p))  // named_expression
         )
@@ -8176,7 +8197,7 @@ as_pattern_rule(Parser *p)
         if (
             (pattern = or_pattern_rule(p))  // or_pattern
             &&
-            (_keyword = _PyPegen_expect_token(p, 685))  // token='as'
+            (_keyword = _PyPegen_expect_token(p, 687))  // token='as'
             &&
             (target = pattern_capture_target_rule(p))  // pattern_capture_target
         )
@@ -11473,11 +11494,11 @@ expression_rule(Parser *p)
         if (
             (a = disjunction_rule(p))  // disjunction
             &&
-            (_keyword = _PyPegen_expect_token(p, 687))  // token='if'
+            (_keyword = _PyPegen_expect_token(p, 689))  // token='if'
             &&
             (b = disjunction_rule(p))  // disjunction
             &&
-            (_keyword_1 = _PyPegen_expect_token(p, 691))  // token='else'
+            (_keyword_1 = _PyPegen_expect_token(p, 693))  // token='else'
             &&
             (c = expression_rule(p))  // expression
         )
@@ -11583,7 +11604,7 @@ yield_expr_rule(Parser *p)
         if (
             (_keyword = _PyPegen_expect_token(p, 588))  // token='yield'
             &&
-            (_keyword_1 = _PyPegen_expect_token(p, 638))  // token='from'
+            (_keyword_1 = _PyPegen_expect_token(p, 640))  // token='from'
             &&
             (a = expression_rule(p))  // expression
         )
@@ -12359,7 +12380,7 @@ inversion_rule(Parser *p)
         Token * _keyword;
         expr_ty a;
         if (
-            (_keyword = _PyPegen_expect_token(p, 708))  // token='not'
+            (_keyword = _PyPegen_expect_token(p, 710))  // token='not'
             &&
             (a = inversion_rule(p))  // inversion
         )
@@ -13013,9 +13034,9 @@ notin_bitwise_or_rule(Parser *p)
         Token * _keyword_1;
         expr_ty a;
         if (
-            (_keyword = _PyPegen_expect_token(p, 708))  // token='not'
+            (_keyword = _PyPegen_expect_token(p, 710))  // token='not'
             &&
-            (_keyword_1 = _PyPegen_expect_token(p, 700))  // token='in'
+            (_keyword_1 = _PyPegen_expect_token(p, 702))  // token='in'
             &&
             (a = bitwise_or_rule(p))  // bitwise_or
         )
@@ -13061,7 +13082,7 @@ in_bitwise_or_rule(Parser *p)
         Token * _keyword;
         expr_ty a;
         if (
-            (_keyword = _PyPegen_expect_token(p, 700))  // token='in'
+            (_keyword = _PyPegen_expect_token(p, 702))  // token='in'
             &&
             (a = bitwise_or_rule(p))  // bitwise_or
         )
@@ -13110,7 +13131,7 @@ isnot_bitwise_or_rule(Parser *p)
         if (
             (_keyword = _PyPegen_expect_token(p, 597))  // token='is'
             &&
-            (_keyword_1 = _PyPegen_expect_token(p, 708))  // token='not'
+            (_keyword_1 = _PyPegen_expect_token(p, 710))  // token='not'
             &&
             (a = bitwise_or_rule(p))  // bitwise_or
         )
@@ -17769,13 +17790,13 @@ for_if_clause_rule(Parser *p)
         expr_ty b;
         asdl_expr_seq* c;
         if (
-            (_keyword = _PyPegen_expect_token(p, 703))  // token='async'
+            (_keyword = _PyPegen_expect_token(p, 705))  // token='async'
             &&
-            (_keyword_1 = _PyPegen_expect_token(p, 699))  // token='for'
+            (_keyword_1 = _PyPegen_expect_token(p, 701))  // token='for'
             &&
             (a = star_targets_rule(p))  // star_targets
             &&
-            (_keyword_2 = _PyPegen_expect_token(p, 700))  // token='in'
+            (_keyword_2 = _PyPegen_expect_token(p, 702))  // token='in'
             &&
             (_cut_var = 1)
             &&
@@ -17814,11 +17835,11 @@ for_if_clause_rule(Parser *p)
         expr_ty b;
         asdl_expr_seq* c;
         if (
-            (_keyword = _PyPegen_expect_token(p, 699))  // token='for'
+            (_keyword = _PyPegen_expect_token(p, 701))  // token='for'
             &&
             (a = star_targets_rule(p))  // star_targets
             &&
-            (_keyword_1 = _PyPegen_expect_token(p, 700))  // token='in'
+            (_keyword_1 = _PyPegen_expect_token(p, 702))  // token='in'
             &&
             (_cut_var = 1)
             &&
@@ -21119,11 +21140,11 @@ expression_without_invalid_rule(Parser *p)
         if (
             (a = disjunction_rule(p))  // disjunction
             &&
-            (_keyword = _PyPegen_expect_token(p, 687))  // token='if'
+            (_keyword = _PyPegen_expect_token(p, 689))  // token='if'
             &&
             (b = disjunction_rule(p))  // disjunction
             &&
-            (_keyword_1 = _PyPegen_expect_token(p, 691))  // token='else'
+            (_keyword_1 = _PyPegen_expect_token(p, 693))  // token='else'
             &&
             (c = expression_rule(p))  // expression
         )
@@ -21423,7 +21444,7 @@ invalid_expression_rule(Parser *p)
         if (
             (a = disjunction_rule(p))  // disjunction
             &&
-            (_keyword = _PyPegen_expect_token(p, 687))  // token='if'
+            (_keyword = _PyPegen_expect_token(p, 689))  // token='if'
             &&
             (b = disjunction_rule(p))  // disjunction
             &&
@@ -21456,11 +21477,11 @@ invalid_expression_rule(Parser *p)
         if (
             (a = disjunction_rule(p))  // disjunction
             &&
-            (_keyword = _PyPegen_expect_token(p, 687))  // token='if'
+            (_keyword = _PyPegen_expect_token(p, 689))  // token='if'
             &&
             (b = disjunction_rule(p))  // disjunction
             &&
-            (_keyword_1 = _PyPegen_expect_token(p, 691))  // token='else'
+            (_keyword_1 = _PyPegen_expect_token(p, 693))  // token='else'
             &&
             _PyPegen_lookahead_for_expr(0, expression_rule, p)
         )
@@ -21492,11 +21513,11 @@ invalid_expression_rule(Parser *p)
         if (
             (a = (stmt_ty)_tmp_116_rule(p))  // pass_stmt | break_stmt | continue_stmt
             &&
-            (_keyword = _PyPegen_expect_token(p, 687))  // token='if'
+            (_keyword = _PyPegen_expect_token(p, 689))  // token='if'
             &&
             (b = disjunction_rule(p))  // disjunction
             &&
-            (_keyword_1 = _PyPegen_expect_token(p, 691))  // token='else'
+            (_keyword_1 = _PyPegen_expect_token(p, 693))  // token='else'
             &&
             (c = simple_stmt_rule(p))  // simple_stmt
         )
@@ -22031,7 +22052,7 @@ invalid_raise_stmt_rule(Parser *p)
         if (
             (a = _PyPegen_expect_token(p, 628))  // token='raise'
             &&
-            (b = _PyPegen_expect_token(p, 638))  // token='from'
+            (b = _PyPegen_expect_token(p, 640))  // token='from'
         )
         {
             D(fprintf(stderr, "%*c+ invalid_raise_stmt[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'raise' 'from'"));
@@ -22061,7 +22082,7 @@ invalid_raise_stmt_rule(Parser *p)
             &&
             (expression_var = expression_rule(p))  // expression
             &&
-            (a = _PyPegen_expect_token(p, 638))  // token='from'
+            (a = _PyPegen_expect_token(p, 640))  // token='from'
         )
         {
             D(fprintf(stderr, "%*c+ invalid_raise_stmt[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'raise' expression 'from'"));
@@ -22129,6 +22150,99 @@ invalid_del_stmt_rule(Parser *p)
     return _res;
 }
 
+// invalid_assert_stmt:
+//     | 'assert' expression '=' expression
+//     | 'assert' expression ',' expression '=' expression
+static void *
+invalid_assert_stmt_rule(Parser *p)
+{
+    if (p->level++ == MAXSTACK || _Py_ReachedRecursionLimitWithMargin(PyThreadState_Get(), 1)) {
+        _Pypegen_stack_overflow(p);
+    }
+    if (p->error_indicator) {
+        p->level--;
+        return NULL;
+    }
+    void * _res = NULL;
+    int _mark = p->mark;
+    { // 'assert' expression '=' expression
+        if (p->error_indicator) {
+            p->level--;
+            return NULL;
+        }
+        D(fprintf(stderr, "%*c> invalid_assert_stmt[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'assert' expression '=' expression"));
+        Token * _keyword;
+        Token * _literal;
+        expr_ty a;
+        expr_ty b;
+        if (
+            (_keyword = _PyPegen_expect_token(p, 632))  // token='assert'
+            &&
+            (a = expression_rule(p))  // expression
+            &&
+            (_literal = _PyPegen_expect_token(p, 22))  // token='='
+            &&
+            (b = expression_rule(p))  // expression
+        )
+        {
+            D(fprintf(stderr, "%*c+ invalid_assert_stmt[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'assert' expression '=' expression"));
+            _res = RAISE_SYNTAX_ERROR_KNOWN_RANGE ( a , b , "cannot assign to %s here. Maybe you meant '==' instead of '='?" , _PyPegen_get_expr_name ( a ) );
+            if (_res == NULL && PyErr_Occurred()) {
+                p->error_indicator = 1;
+                p->level--;
+                return NULL;
+            }
+            goto done;
+        }
+        p->mark = _mark;
+        D(fprintf(stderr, "%*c%s invalid_assert_stmt[%d-%d]: %s failed!\n", p->level, ' ',
+                  p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "'assert' expression '=' expression"));
+    }
+    { // 'assert' expression ',' expression '=' expression
+        if (p->error_indicator) {
+            p->level--;
+            return NULL;
+        }
+        D(fprintf(stderr, "%*c> invalid_assert_stmt[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'assert' expression ',' expression '=' expression"));
+        Token * _keyword;
+        Token * _literal;
+        Token * _literal_1;
+        expr_ty a;
+        expr_ty b;
+        expr_ty expression_var;
+        if (
+            (_keyword = _PyPegen_expect_token(p, 632))  // token='assert'
+            &&
+            (expression_var = expression_rule(p))  // expression
+            &&
+            (_literal = _PyPegen_expect_token(p, 12))  // token=','
+            &&
+            (a = expression_rule(p))  // expression
+            &&
+            (_literal_1 = _PyPegen_expect_token(p, 22))  // token='='
+            &&
+            (b = expression_rule(p))  // expression
+        )
+        {
+            D(fprintf(stderr, "%*c+ invalid_assert_stmt[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'assert' expression ',' expression '=' expression"));
+            _res = RAISE_SYNTAX_ERROR_KNOWN_RANGE ( a , b , "cannot assign to %s here. Maybe you meant '==' instead of '='?" , _PyPegen_get_expr_name ( a ) );
+            if (_res == NULL && PyErr_Occurred()) {
+                p->error_indicator = 1;
+                p->level--;
+                return NULL;
+            }
+            goto done;
+        }
+        p->mark = _mark;
+        D(fprintf(stderr, "%*c%s invalid_assert_stmt[%d-%d]: %s failed!\n", p->level, ' ',
+                  p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "'assert' expression ',' expression '=' expression"));
+    }
+    _res = NULL;
+  done:
+    p->level--;
+    return _res;
+}
+
 // invalid_block: NEWLINE !INDENT
 static void *
 invalid_block_rule(Parser *p)
@@ -23541,7 +23655,7 @@ invalid_with_item_rule(Parser *p)
         if (
             (expression_var = expression_rule(p))  // expression
             &&
-            (_keyword = _PyPegen_expect_token(p, 685))  // token='as'
+            (_keyword = _PyPegen_expect_token(p, 687))  // token='as'
             &&
             (a = expression_rule(p))  // expression
             &&
@@ -23591,13 +23705,13 @@ invalid_for_if_clause_rule(Parser *p)
         UNUSED(_opt_var); // Silence compiler warnings
         void *_tmp_135_var;
         if (
-            (_opt_var = _PyPegen_expect_token(p, 703), !p->error_indicator)  // 'async'?
+            (_opt_var = _PyPegen_expect_token(p, 705), !p->error_indicator)  // 'async'?
             &&
-            (_keyword = _PyPegen_expect_token(p, 699))  // token='for'
+            (_keyword = _PyPegen_expect_token(p, 701))  // token='for'
             &&
             (_tmp_135_var = _tmp_135_rule(p))  // bitwise_or ((',' bitwise_or))* ','?
             &&
-            _PyPegen_lookahead_with_int(0, _PyPegen_expect_token, p, 700)  // token='in'
+            _PyPegen_lookahead_with_int(0, _PyPegen_expect_token, p, 702)  // token='in'
         )
         {
             D(fprintf(stderr, "%*c+ invalid_for_if_clause[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'async'? 'for' (bitwise_or ((',' bitwise_or))* ','?) !'in'"));
@@ -23643,9 +23757,9 @@ invalid_for_target_rule(Parser *p)
         UNUSED(_opt_var); // Silence compiler warnings
         expr_ty a;
         if (
-            (_opt_var = _PyPegen_expect_token(p, 703), !p->error_indicator)  // 'async'?
+            (_opt_var = _PyPegen_expect_token(p, 705), !p->error_indicator)  // 'async'?
             &&
-            (_keyword = _PyPegen_expect_token(p, 699))  // token='for'
+            (_keyword = _PyPegen_expect_token(p, 701))  // token='for'
             &&
             (a = star_expressions_rule(p))  // star_expressions
         )
@@ -23775,11 +23889,11 @@ invalid_import_rule(Parser *p)
         Token * a;
         expr_ty dotted_name_var;
         if (
-            (a = _PyPegen_expect_token(p, 639))  // token='import'
+            (a = _PyPegen_expect_token(p, 641))  // token='import'
             &&
             (_gather_137_var = _gather_137_rule(p))  // ','.dotted_name+
             &&
-            (_keyword = _PyPegen_expect_token(p, 638))  // token='from'
+            (_keyword = _PyPegen_expect_token(p, 640))  // token='from'
             &&
             (dotted_name_var = dotted_name_rule(p))  // dotted_name
         )
@@ -23806,7 +23920,7 @@ invalid_import_rule(Parser *p)
         Token * _keyword;
         Token * token;
         if (
-            (_keyword = _PyPegen_expect_token(p, 639))  // token='import'
+            (_keyword = _PyPegen_expect_token(p, 641))  // token='import'
             &&
             (token = _PyPegen_expect_token(p, NEWLINE))  // token='NEWLINE'
         )
@@ -23855,7 +23969,7 @@ invalid_dotted_as_name_rule(Parser *p)
         if (
             (dotted_name_var = dotted_name_rule(p))  // dotted_name
             &&
-            (_keyword = _PyPegen_expect_token(p, 685))  // token='as'
+            (_keyword = _PyPegen_expect_token(p, 687))  // token='as'
             &&
             _PyPegen_lookahead(0, _tmp_138_rule, p)
             &&
@@ -23906,7 +24020,7 @@ invalid_import_from_as_name_rule(Parser *p)
         if (
             (name_var = _PyPegen_name_token(p))  // NAME
             &&
-            (_keyword = _PyPegen_expect_token(p, 685))  // token='as'
+            (_keyword = _PyPegen_expect_token(p, 687))  // token='as'
             &&
             _PyPegen_lookahead(0, _tmp_138_rule, p)
             &&
@@ -24032,9 +24146,9 @@ invalid_with_stmt_rule(Parser *p)
         UNUSED(_opt_var); // Silence compiler warnings
         Token * newline_var;
         if (
-            (_opt_var = _PyPegen_expect_token(p, 703), !p->error_indicator)  // 'async'?
+            (_opt_var = _PyPegen_expect_token(p, 705), !p->error_indicator)  // 'async'?
             &&
-            (_keyword = _PyPegen_expect_token(p, 652))  // token='with'
+            (_keyword = _PyPegen_expect_token(p, 654))  // token='with'
             &&
             (_gather_140_var = _gather_140_rule(p))  // ','.(expression ['as' star_target])+
             &&
@@ -24070,9 +24184,9 @@ invalid_with_stmt_rule(Parser *p)
         UNUSED(_opt_var_1); // Silence compiler warnings
         Token * newline_var;
         if (
-            (_opt_var = _PyPegen_expect_token(p, 703), !p->error_indicator)  // 'async'?
+            (_opt_var = _PyPegen_expect_token(p, 705), !p->error_indicator)  // 'async'?
             &&
-            (_keyword = _PyPegen_expect_token(p, 652))  // token='with'
+            (_keyword = _PyPegen_expect_token(p, 654))  // token='with'
             &&
             (_literal = _PyPegen_expect_token(p, 7))  // token='('
             &&
@@ -24132,9 +24246,9 @@ invalid_with_stmt_indent_rule(Parser *p)
         Token * a;
         Token * newline_var;
         if (
-            (_opt_var = _PyPegen_expect_token(p, 703), !p->error_indicator)  // 'async'?
+            (_opt_var = _PyPegen_expect_token(p, 705), !p->error_indicator)  // 'async'?
             &&
-            (a = _PyPegen_expect_token(p, 652))  // token='with'
+            (a = _PyPegen_expect_token(p, 654))  // token='with'
             &&
             (_gather_140_var = _gather_140_rule(p))  // ','.(expression ['as' star_target])+
             &&
@@ -24175,9 +24289,9 @@ invalid_with_stmt_indent_rule(Parser *p)
         Token * a;
         Token * newline_var;
         if (
-            (_opt_var = _PyPegen_expect_token(p, 703), !p->error_indicator)  // 'async'?
+            (_opt_var = _PyPegen_expect_token(p, 705), !p->error_indicator)  // 'async'?
             &&
-            (a = _PyPegen_expect_token(p, 652))  // token='with'
+            (a = _PyPegen_expect_token(p, 654))  // token='with'
             &&
             (_literal = _PyPegen_expect_token(p, 7))  // token='('
             &&
@@ -24240,7 +24354,7 @@ invalid_try_stmt_rule(Parser *p)
         Token * a;
         Token * newline_var;
         if (
-            (a = _PyPegen_expect_token(p, 661))  // token='try'
+            (a = _PyPegen_expect_token(p, 663))  // token='try'
             &&
             (_literal = _PyPegen_expect_token(p, 11))  // token=':'
             &&
@@ -24272,7 +24386,7 @@ invalid_try_stmt_rule(Parser *p)
         Token * _literal;
         asdl_stmt_seq* block_var;
         if (
-            (_keyword = _PyPegen_expect_token(p, 661))  // token='try'
+            (_keyword = _PyPegen_expect_token(p, 663))  // token='try'
             &&
             (_literal = _PyPegen_expect_token(p, 11))  // token=':'
             &&
@@ -24311,7 +24425,7 @@ invalid_try_stmt_rule(Parser *p)
         Token * b;
         expr_ty expression_var;
         if (
-            (_keyword = _PyPegen_expect_token(p, 661))  // token='try'
+            (_keyword = _PyPegen_expect_token(p, 663))  // token='try'
             &&
             (_literal = _PyPegen_expect_token(p, 11))  // token=':'
             &&
@@ -24319,7 +24433,7 @@ invalid_try_stmt_rule(Parser *p)
             &&
             (_loop1_36_var = _loop1_36_rule(p))  // except_block+
             &&
-            (a = _PyPegen_expect_token(p, 682))  // token='except'
+            (a = _PyPegen_expect_token(p, 684))  // token='except'
             &&
             (b = _PyPegen_expect_token(p, 16))  // token='*'
             &&
@@ -24358,7 +24472,7 @@ invalid_try_stmt_rule(Parser *p)
         UNUSED(_opt_var); // Silence compiler warnings
         Token * a;
         if (
-            (_keyword = _PyPegen_expect_token(p, 661))  // token='try'
+            (_keyword = _PyPegen_expect_token(p, 663))  // token='try'
             &&
             (_literal = _PyPegen_expect_token(p, 11))  // token=':'
             &&
@@ -24366,7 +24480,7 @@ invalid_try_stmt_rule(Parser *p)
             &&
             (_loop1_37_var = _loop1_37_rule(p))  // except_star_block+
             &&
-            (a = _PyPegen_expect_token(p, 682))  // token='except'
+            (a = _PyPegen_expect_token(p, 684))  // token='except'
             &&
             (_opt_var = _tmp_145_rule(p), !p->error_indicator)  // [expression ['as' NAME]]
             &&
@@ -24423,7 +24537,7 @@ invalid_except_stmt_rule(Parser *p)
         expr_ty expressions_var;
         expr_ty name_var;
         if (
-            (_keyword = _PyPegen_expect_token(p, 682))  // token='except'
+            (_keyword = _PyPegen_expect_token(p, 684))  // token='except'
             &&
             (a = expression_rule(p))  // expression
             &&
@@ -24431,7 +24545,7 @@ invalid_except_stmt_rule(Parser *p)
             &&
             (expressions_var = expressions_rule(p))  // expressions
             &&
-            (_keyword_1 = _PyPegen_expect_token(p, 685))  // token='as'
+            (_keyword_1 = _PyPegen_expect_token(p, 687))  // token='as'
             &&
             (name_var = _PyPegen_name_token(p))  // NAME
             &&
@@ -24463,7 +24577,7 @@ invalid_except_stmt_rule(Parser *p)
         expr_ty expression_var;
         Token * newline_var;
         if (
-            (a = _PyPegen_expect_token(p, 682))  // token='except'
+            (a = _PyPegen_expect_token(p, 684))  // token='except'
             &&
             (expression_var = expression_rule(p))  // expression
             &&
@@ -24494,7 +24608,7 @@ invalid_except_stmt_rule(Parser *p)
         Token * a;
         Token * newline_var;
         if (
-            (a = _PyPegen_expect_token(p, 682))  // token='except'
+            (a = _PyPegen_expect_token(p, 684))  // token='except'
             &&
             (newline_var = _PyPegen_expect_token(p, NEWLINE))  // token='NEWLINE'
         )
@@ -24525,11 +24639,11 @@ invalid_except_stmt_rule(Parser *p)
         asdl_stmt_seq* block_var;
         expr_ty expression_var;
         if (
-            (_keyword = _PyPegen_expect_token(p, 682))  // token='except'
+            (_keyword = _PyPegen_expect_token(p, 684))  // token='except'
             &&
             (expression_var = expression_rule(p))  // expression
             &&
-            (_keyword_1 = _PyPegen_expect_token(p, 685))  // token='as'
+            (_keyword_1 = _PyPegen_expect_token(p, 687))  // token='as'
             &&
             (a = expression_rule(p))  // expression
             &&
@@ -24589,7 +24703,7 @@ invalid_except_star_stmt_rule(Parser *p)
         expr_ty expressions_var;
         expr_ty name_var;
         if (
-            (_keyword = _PyPegen_expect_token(p, 682))  // token='except'
+            (_keyword = _PyPegen_expect_token(p, 684))  // token='except'
             &&
             (_literal = _PyPegen_expect_token(p, 16))  // token='*'
             &&
@@ -24599,7 +24713,7 @@ invalid_except_star_stmt_rule(Parser *p)
             &&
             (expressions_var = expressions_rule(p))  // expressions
             &&
-            (_keyword_1 = _PyPegen_expect_token(p, 685))  // token='as'
+            (_keyword_1 = _PyPegen_expect_token(p, 687))  // token='as'
             &&
             (name_var = _PyPegen_name_token(p))  // NAME
             &&
@@ -24632,7 +24746,7 @@ invalid_except_star_stmt_rule(Parser *p)
         expr_ty expression_var;
         Token * newline_var;
         if (
-            (a = _PyPegen_expect_token(p, 682))  // token='except'
+            (a = _PyPegen_expect_token(p, 684))  // token='except'
             &&
             (_literal = _PyPegen_expect_token(p, 16))  // token='*'
             &&
@@ -24666,7 +24780,7 @@ invalid_except_star_stmt_rule(Parser *p)
         void *_tmp_146_var;
         Token * a;
         if (
-            (a = _PyPegen_expect_token(p, 682))  // token='except'
+            (a = _PyPegen_expect_token(p, 684))  // token='except'
             &&
             (_literal = _PyPegen_expect_token(p, 16))  // token='*'
             &&
@@ -24700,13 +24814,13 @@ invalid_except_star_stmt_rule(Parser *p)
         asdl_stmt_seq* block_var;
         expr_ty expression_var;
         if (
-            (_keyword = _PyPegen_expect_token(p, 682))  // token='except'
+            (_keyword = _PyPegen_expect_token(p, 684))  // token='except'
             &&
             (_literal = _PyPegen_expect_token(p, 16))  // token='*'
             &&
             (expression_var = expression_rule(p))  // expression
             &&
-            (_keyword_1 = _PyPegen_expect_token(p, 685))  // token='as'
+            (_keyword_1 = _PyPegen_expect_token(p, 687))  // token='as'
             &&
             (a = expression_rule(p))  // expression
             &&
@@ -24757,7 +24871,7 @@ invalid_finally_stmt_rule(Parser *p)
         Token * a;
         Token * newline_var;
         if (
-            (a = _PyPegen_expect_token(p, 678))  // token='finally'
+            (a = _PyPegen_expect_token(p, 680))  // token='finally'
             &&
             (_literal = _PyPegen_expect_token(p, 11))  // token=':'
             &&
@@ -24813,7 +24927,7 @@ invalid_except_stmt_indent_rule(Parser *p)
         expr_ty expression_var;
         Token * newline_var;
         if (
-            (a = _PyPegen_expect_token(p, 682))  // token='except'
+            (a = _PyPegen_expect_token(p, 684))  // token='except'
             &&
             (expression_var = expression_rule(p))  // expression
             &&
@@ -24849,7 +24963,7 @@ invalid_except_stmt_indent_rule(Parser *p)
         Token * a;
         Token * newline_var;
         if (
-            (a = _PyPegen_expect_token(p, 682))  // token='except'
+            (a = _PyPegen_expect_token(p, 684))  // token='except'
             &&
             (_literal = _PyPegen_expect_token(p, 11))  // token=':'
             &&
@@ -24905,7 +25019,7 @@ invalid_except_star_stmt_indent_rule(Parser *p)
         expr_ty expression_var;
         Token * newline_var;
         if (
-            (a = _PyPegen_expect_token(p, 682))  // token='except'
+            (a = _PyPegen_expect_token(p, 684))  // token='except'
             &&
             (_literal = _PyPegen_expect_token(p, 16))  // token='*'
             &&
@@ -25144,7 +25258,7 @@ invalid_as_pattern_rule(Parser *p)
         if (
             (or_pattern_var = or_pattern_rule(p))  // or_pattern
             &&
-            (_keyword = _PyPegen_expect_token(p, 685))  // token='as'
+            (_keyword = _PyPegen_expect_token(p, 687))  // token='as'
             &&
             (a = _PyPegen_expect_soft_keyword(p, "_"))  // soft_keyword='"_"'
         )
@@ -25174,7 +25288,7 @@ invalid_as_pattern_rule(Parser *p)
         if (
             (or_pattern_var = or_pattern_rule(p))  // or_pattern
             &&
-            (_keyword = _PyPegen_expect_token(p, 685))  // token='as'
+            (_keyword = _PyPegen_expect_token(p, 687))  // token='as'
             &&
             (a = expression_rule(p))  // expression
         )
@@ -25326,7 +25440,7 @@ invalid_if_stmt_rule(Parser *p)
         expr_ty named_expression_var;
         Token * newline_var;
         if (
-            (_keyword = _PyPegen_expect_token(p, 687))  // token='if'
+            (_keyword = _PyPegen_expect_token(p, 689))  // token='if'
             &&
             (named_expression_var = named_expression_rule(p))  // named_expression
             &&
@@ -25357,7 +25471,7 @@ invalid_if_stmt_rule(Parser *p)
         expr_ty a_1;
         Token * newline_var;
         if (
-            (a = _PyPegen_expect_token(p, 687))  // token='if'
+            (a = _PyPegen_expect_token(p, 689))  // token='if'
             &&
             (a_1 = named_expression_rule(p))  // named_expression
             &&
@@ -25412,7 +25526,7 @@ invalid_elif_stmt_rule(Parser *p)
         expr_ty named_expression_var;
         Token * newline_var;
         if (
-            (_keyword = _PyPegen_expect_token(p, 692))  // token='elif'
+            (_keyword = _PyPegen_expect_token(p, 694))  // token='elif'
             &&
             (named_expression_var = named_expression_rule(p))  // named_expression
             &&
@@ -25443,7 +25557,7 @@ invalid_elif_stmt_rule(Parser *p)
         expr_ty named_expression_var;
         Token * newline_var;
         if (
-            (a = _PyPegen_expect_token(p, 692))  // token='elif'
+            (a = _PyPegen_expect_token(p, 694))  // token='elif'
             &&
             (named_expression_var = named_expression_rule(p))  // named_expression
             &&
@@ -25496,7 +25610,7 @@ invalid_else_stmt_rule(Parser *p)
         Token * a;
         Token * newline_var;
         if (
-            (a = _PyPegen_expect_token(p, 691))  // token='else'
+            (a = _PyPegen_expect_token(p, 693))  // token='else'
             &&
             (_literal = _PyPegen_expect_token(p, 11))  // token=':'
             &&
@@ -25529,13 +25643,13 @@ invalid_else_stmt_rule(Parser *p)
         Token * _literal;
         asdl_stmt_seq* block_var;
         if (
-            (_keyword = _PyPegen_expect_token(p, 691))  // token='else'
+            (_keyword = _PyPegen_expect_token(p, 693))  // token='else'
             &&
             (_literal = _PyPegen_expect_token(p, 11))  // token=':'
             &&
             (block_var = block_rule(p))  // block
             &&
-            (_keyword_1 = _PyPegen_expect_token(p, 692))  // token='elif'
+            (_keyword_1 = _PyPegen_expect_token(p, 694))  // token='elif'
         )
         {
             D(fprintf(stderr, "%*c+ invalid_else_stmt[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'else' ':' block 'elif'"));
@@ -25582,7 +25696,7 @@ invalid_while_stmt_rule(Parser *p)
         expr_ty named_expression_var;
         Token * newline_var;
         if (
-            (_keyword = _PyPegen_expect_token(p, 694))  // token='while'
+            (_keyword = _PyPegen_expect_token(p, 696))  // token='while'
             &&
             (named_expression_var = named_expression_rule(p))  // named_expression
             &&
@@ -25613,7 +25727,7 @@ invalid_while_stmt_rule(Parser *p)
         expr_ty named_expression_var;
         Token * newline_var;
         if (
-            (a = _PyPegen_expect_token(p, 694))  // token='while'
+            (a = _PyPegen_expect_token(p, 696))  // token='while'
             &&
             (named_expression_var = named_expression_rule(p))  // named_expression
             &&
@@ -25672,13 +25786,13 @@ invalid_for_stmt_rule(Parser *p)
         expr_ty star_expressions_var;
         expr_ty star_targets_var;
         if (
-            (_opt_var = _PyPegen_expect_token(p, 703), !p->error_indicator)  // 'async'?
+            (_opt_var = _PyPegen_expect_token(p, 705), !p->error_indicator)  // 'async'?
             &&
-            (_keyword = _PyPegen_expect_token(p, 699))  // token='for'
+            (_keyword = _PyPegen_expect_token(p, 701))  // token='for'
             &&
             (star_targets_var = star_targets_rule(p))  // star_targets
             &&
-            (_keyword_1 = _PyPegen_expect_token(p, 700))  // token='in'
+            (_keyword_1 = _PyPegen_expect_token(p, 702))  // token='in'
             &&
             (star_expressions_var = star_expressions_rule(p))  // star_expressions
             &&
@@ -25713,13 +25827,13 @@ invalid_for_stmt_rule(Parser *p)
         expr_ty star_expressions_var;
         expr_ty star_targets_var;
         if (
-            (_opt_var = _PyPegen_expect_token(p, 703), !p->error_indicator)  // 'async'?
+            (_opt_var = _PyPegen_expect_token(p, 705), !p->error_indicator)  // 'async'?
             &&
-            (a = _PyPegen_expect_token(p, 699))  // token='for'
+            (a = _PyPegen_expect_token(p, 701))  // token='for'
             &&
             (star_targets_var = star_targets_rule(p))  // star_targets
             &&
-            (_keyword = _PyPegen_expect_token(p, 700))  // token='in'
+            (_keyword = _PyPegen_expect_token(p, 702))  // token='in'
             &&
             (star_expressions_var = star_expressions_rule(p))  // star_expressions
             &&
@@ -25785,9 +25899,9 @@ invalid_def_raw_rule(Parser *p)
         expr_ty name_var;
         Token * newline_var;
         if (
-            (_opt_var = _PyPegen_expect_token(p, 703), !p->error_indicator)  // 'async'?
+            (_opt_var = _PyPegen_expect_token(p, 705), !p->error_indicator)  // 'async'?
             &&
-            (a = _PyPegen_expect_token(p, 704))  // token='def'
+            (a = _PyPegen_expect_token(p, 706))  // token='def'
             &&
             (name_var = _PyPegen_name_token(p))  // NAME
             &&
@@ -25844,9 +25958,9 @@ invalid_def_raw_rule(Parser *p)
         asdl_stmt_seq* block_var;
         expr_ty name_var;
         if (
-            (_opt_var = _PyPegen_expect_token(p, 703), !p->error_indicator)  // 'async'?
+            (_opt_var = _PyPegen_expect_token(p, 705), !p->error_indicator)  // 'async'?
             &&
-            (_keyword = _PyPegen_expect_token(p, 704))  // token='def'
+            (_keyword = _PyPegen_expect_token(p, 706))  // token='def'
             &&
             (name_var = _PyPegen_name_token(p))  // NAME
             &&
@@ -25910,7 +26024,7 @@ invalid_class_def_raw_rule(Parser *p)
         expr_ty name_var;
         Token * newline_var;
         if (
-            (_keyword = _PyPegen_expect_token(p, 706))  // token='class'
+            (_keyword = _PyPegen_expect_token(p, 708))  // token='class'
             &&
             (name_var = _PyPegen_name_token(p))  // NAME
             &&
@@ -25949,7 +26063,7 @@ invalid_class_def_raw_rule(Parser *p)
         expr_ty name_var;
         Token * newline_var;
         if (
-            (a = _PyPegen_expect_token(p, 706))  // token='class'
+            (a = _PyPegen_expect_token(p, 708))  // token='class'
             &&
             (name_var = _PyPegen_name_token(p))  // NAME
             &&
@@ -27284,7 +27398,7 @@ invalid_arithmetic_rule(Parser *p)
             &&
             (_tmp_154_var = _tmp_154_rule(p))  // '+' | '-' | '*' | '/' | '%' | '//' | '@'
             &&
-            (a = _PyPegen_expect_token(p, 708))  // token='not'
+            (a = _PyPegen_expect_token(p, 710))  // token='not'
             &&
             (b = inversion_rule(p))  // inversion
         )
@@ -27333,7 +27447,7 @@ invalid_factor_rule(Parser *p)
         if (
             (_tmp_155_var = _tmp_155_rule(p))  // '+' | '-' | '~'
             &&
-            (a = _PyPegen_expect_token(p, 708))  // token='not'
+            (a = _PyPegen_expect_token(p, 710))  // token='not'
             &&
             (b = factor_rule(p))  // factor
         )
@@ -27680,7 +27794,7 @@ _tmp_5_rule(Parser *p)
         D(fprintf(stderr, "%*c> _tmp_5[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'import'"));
         Token * _keyword;
         if (
-            (_keyword = _PyPegen_expect_token(p, 639))  // token='import'
+            (_keyword = _PyPegen_expect_token(p, 641))  // token='import'
         )
         {
             D(fprintf(stderr, "%*c+ _tmp_5[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'import'"));
@@ -27699,7 +27813,7 @@ _tmp_5_rule(Parser *p)
         D(fprintf(stderr, "%*c> _tmp_5[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'from'"));
         Token * _keyword;
         if (
-            (_keyword = _PyPegen_expect_token(p, 638))  // token='from'
+            (_keyword = _PyPegen_expect_token(p, 640))  // token='from'
         )
         {
             D(fprintf(stderr, "%*c+ _tmp_5[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'from'"));
@@ -27737,7 +27851,7 @@ _tmp_6_rule(Parser *p)
         D(fprintf(stderr, "%*c> _tmp_6[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'def'"));
         Token * _keyword;
         if (
-            (_keyword = _PyPegen_expect_token(p, 704))  // token='def'
+            (_keyword = _PyPegen_expect_token(p, 706))  // token='def'
         )
         {
             D(fprintf(stderr, "%*c+ _tmp_6[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'def'"));
@@ -27775,7 +27889,7 @@ _tmp_6_rule(Parser *p)
         D(fprintf(stderr, "%*c> _tmp_6[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'async'"));
         Token * _keyword;
         if (
-            (_keyword = _PyPegen_expect_token(p, 703))  // token='async'
+            (_keyword = _PyPegen_expect_token(p, 705))  // token='async'
         )
         {
             D(fprintf(stderr, "%*c+ _tmp_6[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'async'"));
@@ -27813,7 +27927,7 @@ _tmp_7_rule(Parser *p)
         D(fprintf(stderr, "%*c> _tmp_7[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'class'"));
         Token * _keyword;
         if (
-            (_keyword = _PyPegen_expect_token(p, 706))  // token='class'
+            (_keyword = _PyPegen_expect_token(p, 708))  // token='class'
         )
         {
             D(fprintf(stderr, "%*c+ _tmp_7[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'class'"));
@@ -27870,7 +27984,7 @@ _tmp_8_rule(Parser *p)
         D(fprintf(stderr, "%*c> _tmp_8[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'with'"));
         Token * _keyword;
         if (
-            (_keyword = _PyPegen_expect_token(p, 652))  // token='with'
+            (_keyword = _PyPegen_expect_token(p, 654))  // token='with'
         )
         {
             D(fprintf(stderr, "%*c+ _tmp_8[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'with'"));
@@ -27889,7 +28003,7 @@ _tmp_8_rule(Parser *p)
         D(fprintf(stderr, "%*c> _tmp_8[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'async'"));
         Token * _keyword;
         if (
-            (_keyword = _PyPegen_expect_token(p, 703))  // token='async'
+            (_keyword = _PyPegen_expect_token(p, 705))  // token='async'
         )
         {
             D(fprintf(stderr, "%*c+ _tmp_8[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'async'"));
@@ -27927,7 +28041,7 @@ _tmp_9_rule(Parser *p)
         D(fprintf(stderr, "%*c> _tmp_9[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'for'"));
         Token * _keyword;
         if (
-            (_keyword = _PyPegen_expect_token(p, 699))  // token='for'
+            (_keyword = _PyPegen_expect_token(p, 701))  // token='for'
         )
         {
             D(fprintf(stderr, "%*c+ _tmp_9[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'for'"));
@@ -27946,7 +28060,7 @@ _tmp_9_rule(Parser *p)
         D(fprintf(stderr, "%*c> _tmp_9[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'async'"));
         Token * _keyword;
         if (
-            (_keyword = _PyPegen_expect_token(p, 703))  // token='async'
+            (_keyword = _PyPegen_expect_token(p, 705))  // token='async'
         )
         {
             D(fprintf(stderr, "%*c+ _tmp_9[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'async'"));
@@ -28647,7 +28761,7 @@ _tmp_21_rule(Parser *p)
         Token * _keyword;
         expr_ty z;
         if (
-            (_keyword = _PyPegen_expect_token(p, 685))  // token='as'
+            (_keyword = _PyPegen_expect_token(p, 687))  // token='as'
             &&
             (z = _PyPegen_name_token(p))  // NAME
         )
@@ -34483,7 +34597,7 @@ _tmp_115_rule(Parser *p)
         D(fprintf(stderr, "%*c> _tmp_115[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'else'"));
         Token * _keyword;
         if (
-            (_keyword = _PyPegen_expect_token(p, 691))  // token='else'
+            (_keyword = _PyPegen_expect_token(p, 693))  // token='else'
         )
         {
             D(fprintf(stderr, "%*c+ _tmp_115[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'else'"));
@@ -36222,7 +36336,7 @@ _tmp_143_rule(Parser *p)
         D(fprintf(stderr, "%*c> _tmp_143[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'except'"));
         Token * _keyword;
         if (
-            (_keyword = _PyPegen_expect_token(p, 682))  // token='except'
+            (_keyword = _PyPegen_expect_token(p, 684))  // token='except'
         )
         {
             D(fprintf(stderr, "%*c+ _tmp_143[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'except'"));
@@ -36241,7 +36355,7 @@ _tmp_143_rule(Parser *p)
         D(fprintf(stderr, "%*c> _tmp_143[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'finally'"));
         Token * _keyword;
         if (
-            (_keyword = _PyPegen_expect_token(p, 678))  // token='finally'
+            (_keyword = _PyPegen_expect_token(p, 680))  // token='finally'
         )
         {
             D(fprintf(stderr, "%*c+ _tmp_143[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'finally'"));
@@ -37445,7 +37559,7 @@ _tmp_163_rule(Parser *p)
         Token * _keyword;
         expr_ty z;
         if (
-            (_keyword = _PyPegen_expect_token(p, 687))  // token='if'
+            (_keyword = _PyPegen_expect_token(p, 689))  // token='if'
             &&
             (z = disjunction_rule(p))  // disjunction
         )
@@ -38103,7 +38217,7 @@ _tmp_176_rule(Parser *p)
         Token * _keyword;
         expr_ty star_target_var;
         if (
-            (_keyword = _PyPegen_expect_token(p, 685))  // token='as'
+            (_keyword = _PyPegen_expect_token(p, 687))  // token='as'
             &&
             (star_target_var = star_target_rule(p))  // star_target
         )

From 137519a38ccabcb009a2b1b7eab1fbbf9c3ceae0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?L=C3=A1szl=C3=B3=20Kiss=20Koll=C3=A1r?=
 <kiss.kollar.laszlo@gmail.com>
Date: Tue, 9 Sep 2025 23:06:45 +0100
Subject: [PATCH 4/4] gh-135953: Add flamegraph reporter to sampling profiler
 (#138715)

---
 .gitattributes                                |   1 +
 Doc/license.rst                               |  30 ++
 .../sampling/_assets/python-logo-only.png     | Bin 0 -> 20637 bytes
 .../4.1.3/d3-flamegraph-tooltip.min.js        |   1 +
 .../d3-flame-graph/4.1.3/d3-flamegraph.css    |  46 ++
 .../d3-flame-graph/4.1.3/d3-flamegraph.min.js |   1 +
 .../sampling/_vendor/d3/7.8.5/d3.min.js       |   2 +
 Lib/profiling/sampling/flamegraph.css         | 405 ++++++++++++++++
 Lib/profiling/sampling/flamegraph.js          | 445 ++++++++++++++++++
 .../sampling/flamegraph_template.html         | 147 ++++++
 Lib/profiling/sampling/sample.py              |  36 +-
 Lib/profiling/sampling/stack_collector.py     | 231 +++++++++
 .../test_profiling/test_sampling_profiler.py  | 104 ++++
 Makefile.pre.in                               |   3 +
 14 files changed, 1446 insertions(+), 6 deletions(-)
 create mode 100644 Lib/profiling/sampling/_assets/python-logo-only.png
 create mode 100644 Lib/profiling/sampling/_vendor/d3-flame-graph/4.1.3/d3-flamegraph-tooltip.min.js
 create mode 100644 Lib/profiling/sampling/_vendor/d3-flame-graph/4.1.3/d3-flamegraph.css
 create mode 100644 Lib/profiling/sampling/_vendor/d3-flame-graph/4.1.3/d3-flamegraph.min.js
 create mode 100644 Lib/profiling/sampling/_vendor/d3/7.8.5/d3.min.js
 create mode 100644 Lib/profiling/sampling/flamegraph.css
 create mode 100644 Lib/profiling/sampling/flamegraph.js
 create mode 100644 Lib/profiling/sampling/flamegraph_template.html

diff --git a/.gitattributes b/.gitattributes
index 5682b9150a36e2..823e3e975a23a8 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -103,3 +103,4 @@ Python/stdlib_module_names.h                        generated
 Tools/peg_generator/pegen/grammar_parser.py         generated
 aclocal.m4                                          generated
 configure                                           generated
+*.min.js                                            generated
diff --git a/Doc/license.rst b/Doc/license.rst
index 480414bb84c4f2..269d14cefbcefa 100644
--- a/Doc/license.rst
+++ b/Doc/license.rst
@@ -1169,3 +1169,33 @@ contributors. The pyzstd code is distributed under the 3-Clause BSD License::
   CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+Profiling module
+----------------
+
+The :mod:`!profiling` module includes vendored third-party libraries in
+:file:`Lib/profiling/sampling/_vendor/` with the following licenses:
+
+**d3-flamegraph**
+
+The d3-flamegraph library is distributed under the Apache License, Version 2.0.
+See the OpenSSL section above for the full text of the Apache License Version 2.0.
+
+**d3.js**
+
+The d3.js library contains the following notice::
+
+  Copyright 2010-2021 Mike Bostock
+
+  Permission to use, copy, modify, and/or distribute this software for any purpose
+  with or without fee is hereby granted, provided that the above copyright notice
+  and this permission notice appear in all copies.
+
+  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+  REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+  INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+  OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+  TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+  THIS SOFTWARE.
diff --git a/Lib/profiling/sampling/_assets/python-logo-only.png b/Lib/profiling/sampling/_assets/python-logo-only.png
new file mode 100644
index 0000000000000000000000000000000000000000..20f36f4d4521494f8de713879e9ad1c948dad5e0
GIT binary patch
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+  fill-opacity: .8;
+}
+
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+  stroke-width: 0.5;
+  cursor: pointer;
+}
+
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+  white-space: nowrap;
+  text-overflow: ellipsis;
+  overflow: hidden;
+  font-size: 12px;
+  font-family: Verdana;
+  margin-left: 4px;
+  margin-right: 4px;
+  line-height: 1.5;
+  padding: 0 0 0;
+  font-weight: 400;
+  color: black;
+  text-align: left;
+}
+
+.d3-flame-graph .fade {
+  opacity: 0.6 !important;
+}
+
+.d3-flame-graph .title {
+  font-size: 20px;
+  font-family: Verdana;
+}
+
+.d3-flame-graph-tip {
+    background-color: black;
+    border: none;
+    border-radius: 3px;
+    padding: 5px 10px 5px 10px;
+    min-width: 250px;
+    text-align: left;
+    color: white;
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+}
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n=0;n<o;n++)this._dists[n]=Eu(t[2*n],t[2*n+1],M.x,M.y);Cu(this._ids,this._dists,0,o-1),this._hullStart=h;let T=3;e[h]=n[p]=d,e[d]=n[h]=p,e[p]=n[d]=h,r[h]=0,r[d]=1,r[p]=2,i.fill(-1),i[this._hashKey(y,v)]=h,i[this._hashKey(_,b)]=d,i[this._hashKey(x,w)]=p,this.trianglesLen=0,this._addTriangle(h,d,p,-1,-1,-1);for(let o,a,u=0;u<this._ids.length;u++){const c=this._ids[u],f=t[2*c],s=t[2*c+1];if(u>0&&Math.abs(f-o)<=Tu&&Math.abs(s-a)<=Tu)continue;if(o=f,a=s,c===h||c===d||c===p)continue;let l=0;for(let t=0,n=this._hashKey(f,s);t<this._hashSize&&(l=i[(n+t)%this._hashSize],-1===l||l===e[l]);t++);l=n[l];let g,y=l;for(;g=e[y],Mu(f,s,t[2*y],t[2*y+1],t[2*g],t[2*g+1])>=0;)if(y=g,y===l){y=-1;break}if(-1===y)continue;let v=this._addTriangle(y,c,e[y],-1,-1,r[y]);r[c]=this._legalize(v+2),r[y]=v,T++;let _=e[y];for(;g=e[_],Mu(f,s,t[2*_],t[2*_+1],t[2*g],t[2*g+1])<0;)v=this._addTriangle(_,c,g,r[c],-1,r[_]),r[c]=this._legalize(v+2),e[_]=_,T--,_=g;if(y===l)for(;g=n[y],Mu(f,s,t[2*g],t[2*g+1],t[2*y],t[2*y+1])<0;)v=this._addTriangle(g,c,y,-1,r[y],r[g]),this._legalize(v+2),r[g]=v,e[y]=y,T--,y=g;this._hullStart=n[c]=y,e[y]=n[_]=c,e[c]=_,i[this._hashKey(f,s)]=c,i[this._hashKey(t[2*y],t[2*y+1])]=y}this.hull=new Uint32Array(T);for(let t=0,n=this._hullStart;t<T;t++)this.hull[t]=n,n=e[n];this.triangles=this._triangles.subarray(0,this.trianglesLen),this.halfedges=this._halfedges.subarray(0,this.trianglesLen)}_hashKey(t,n){return Math.floor(function(t,n){const e=t/(Math.abs(t)+Math.abs(n));return(n>0?3-e:1+e)/4}(t-this._cx,n-this._cy)*this._hashSize)%this._hashSize}_legalize(t){const{_triangles:n,_halfedges:e,coords:r}=this;let i=0,o=0;for(;;){const a=e[t],u=t-t%3;if(o=u+(t+2)%3,-1===a){if(0===i)break;t=Au[--i];continue}const c=a-a%3,f=u+(t+1)%3,s=c+(a+2)%3,l=n[o],h=n[t],d=n[f],p=n[s];if(Nu(r[2*l],r[2*l+1],r[2*h],r[2*h+1],r[2*d],r[2*d+1],r[2*p],r[2*p+1])){n[t]=p,n[a]=l;const r=e[s];if(-1===r){let n=this._hullStart;do{if(this._hullTri[n]===s){this._hullTri[n]=t;break}n=this._hullPrev[n]}while(n!==this._hullStart)}this._link(t,r),this._link(a,e[o]),this._link(o,s);const u=c+(a+1)%3;i<Au.length&&(Au[i++]=u)}else{if(0===i)break;t=Au[--i]}}return o}_link(t,n){this._halfedges[t]=n,-1!==n&&(this._halfedges[n]=t)}_addTriangle(t,n,e,r,i,o){const a=this.trianglesLen;return this._triangles[a]=t,this._triangles[a+1]=n,this._triangles[a+2]=e,this._link(a,r),this._link(a+1,i),this._link(a+2,o),this.trianglesLen+=3,a}}function Eu(t,n,e,r){const i=t-e,o=n-r;return i*i+o*o}function Nu(t,n,e,r,i,o,a,u){const c=t-a,f=n-u,s=e-a,l=r-u,h=i-a,d=o-u,p=s*s+l*l,g=h*h+d*d;return c*(l*g-p*d)-f*(s*g-p*h)+(c*c+f*f)*(s*d-l*h)<0}function ku(t,n,e,r,i,o){const a=e-t,u=r-n,c=i-t,f=o-n,s=a*a+u*u,l=c*c+f*f,h=.5/(a*f-u*c),d=(f*s-u*l)*h,p=(a*l-c*s)*h;return d*d+p*p}function Cu(t,n,e,r){if(r-e<=20)for(let i=e+1;i<=r;i++){const r=t[i],o=n[r];let a=i-1;for(;a>=e&&n[t[a]]>o;)t[a+1]=t[a--];t[a+1]=r}else{let i=e+1,o=r;Pu(t,e+r>>1,i),n[t[e]]>n[t[r]]&&Pu(t,e,r),n[t[i]]>n[t[r]]&&Pu(t,i,r),n[t[e]]>n[t[i]]&&Pu(t,e,i);const a=t[i],u=n[a];for(;;){do{i++}while(n[t[i]]<u);do{o--}while(n[t[o]]>u);if(o<i)break;Pu(t,i,o)}t[e+1]=t[o],t[o]=a,r-i+1>=o-e?(Cu(t,n,i,r),Cu(t,n,e,o-1)):(Cu(t,n,e,o-1),Cu(t,n,i,r))}}function Pu(t,n,e){const r=t[n];t[n]=t[e],t[e]=r}function zu(t){return t[0]}function $u(t){return t[1]}const Du=1e-6;class Ru{constructor(){this._x0=this._y0=this._x1=this._y1=null,this._=""}moveTo(t,n){this._+=`M${this._x0=this._x1=+t},${this._y0=this._y1=+n}`}closePath(){null!==this._x1&&(this._x1=this._x0,this._y1=this._y0,this._+="Z")}lineTo(t,n){this._+=`L${this._x1=+t},${this._y1=+n}`}arc(t,n,e){const r=(t=+t)+(e=+e),i=n=+n;if(e<0)throw new Error("negative radius");null===this._x1?this._+=`M${r},${i}`:(Math.abs(this._x1-r)>Du||Math.abs(this._y1-i)>Du)&&(this._+="L"+r+","+i),e&&(this._+=`A${e},${e},0,1,1,${t-e},${n}A${e},${e},0,1,1,${this._x1=r},${this._y1=i}`)}rect(t,n,e,r){this._+=`M${this._x0=this._x1=+t},${this._y0=this._y1=+n}h${+e}v${+r}h${-e}Z`}value(){return this._||null}}class Fu{constructor(){this._=[]}moveTo(t,n){this._.push([t,n])}closePath(){this._.push(this._[0].slice())}lineTo(t,n){this._.push([t,n])}value(){return this._.length?this._:null}}class qu{constructor(t,[n,e,r,i]=[0,0,960,500]){if(!((r=+r)>=(n=+n)&&(i=+i)>=(e=+e)))throw new Error("invalid bounds");this.delaunay=t,this._circumcenters=new Float64Array(2*t.points.length),this.vectors=new Float64Array(2*t.points.length),this.xmax=r,this.xmin=n,this.ymax=i,this.ymin=e,this._init()}update(){return this.delaunay.update(),this._init(),this}_init(){const{delaunay:{points:t,hull:n,triangles:e},vectors:r}=this;let i,o;const a=this.circumcenters=this._circumcenters.subarray(0,e.length/3*2);for(let r,u,c=0,f=0,s=e.length;c<s;c+=3,f+=2){const s=2*e[c],l=2*e[c+1],h=2*e[c+2],d=t[s],p=t[s+1],g=t[l],y=t[l+1],v=t[h],_=t[h+1],b=g-d,m=y-p,x=v-d,w=_-p,M=2*(b*w-m*x);if(Math.abs(M)<1e-9){if(void 0===i){i=o=0;for(const e of n)i+=t[2*e],o+=t[2*e+1];i/=n.length,o/=n.length}const e=1e9*Math.sign((i-d)*w-(o-p)*x);r=(d+v)/2-e*w,u=(p+_)/2+e*x}else{const t=1/M,n=b*b+m*m,e=x*x+w*w;r=d+(w*n-m*e)*t,u=p+(b*e-x*n)*t}a[f]=r,a[f+1]=u}let u,c,f,s=n[n.length-1],l=4*s,h=t[2*s],d=t[2*s+1];r.fill(0);for(let e=0;e<n.length;++e)s=n[e],u=l,c=h,f=d,l=4*s,h=t[2*s],d=t[2*s+1],r[u+2]=r[l]=f-d,r[u+3]=r[l+1]=h-c}render(t){const n=null==t?t=new Ru:void 0,{delaunay:{halfedges:e,inedges:r,hull:i},circumcenters:o,vectors:a}=this;if(i.length<=1)return null;for(let n=0,r=e.length;n<r;++n){const r=e[n];if(r<n)continue;const i=2*Math.floor(n/3),a=2*Math.floor(r/3),u=o[i],c=o[i+1],f=o[a],s=o[a+1];this._renderSegment(u,c,f,s,t)}let u,c=i[i.length-1];for(let n=0;n<i.length;++n){u=c,c=i[n];const e=2*Math.floor(r[c]/3),f=o[e],s=o[e+1],l=4*u,h=this._project(f,s,a[l+2],a[l+3]);h&&this._renderSegment(f,s,h[0],h[1],t)}return n&&n.value()}renderBounds(t){const n=null==t?t=new Ru:void 0;return t.rect(this.xmin,this.ymin,this.xmax-this.xmin,this.ymax-this.ymin),n&&n.value()}renderCell(t,n){const e=null==n?n=new Ru:void 0,r=this._clip(t);if(null===r||!r.length)return;n.moveTo(r[0],r[1]);let i=r.length;for(;r[0]===r[i-2]&&r[1]===r[i-1]&&i>1;)i-=2;for(let t=2;t<i;t+=2)r[t]===r[t-2]&&r[t+1]===r[t-1]||n.lineTo(r[t],r[t+1]);return n.closePath(),e&&e.value()}*cellPolygons(){const{delaunay:{points:t}}=this;for(let n=0,e=t.length/2;n<e;++n){const t=this.cellPolygon(n);t&&(t.index=n,yield t)}}cellPolygon(t){const n=new Fu;return this.renderCell(t,n),n.value()}_renderSegment(t,n,e,r,i){let o;const a=this._regioncode(t,n),u=this._regioncode(e,r);0===a&&0===u?(i.moveTo(t,n),i.lineTo(e,r)):(o=this._clipSegment(t,n,e,r,a,u))&&(i.moveTo(o[0],o[1]),i.lineTo(o[2],o[3]))}contains(t,n,e){return(n=+n)==n&&(e=+e)==e&&this.delaunay._step(t,n,e)===t}*neighbors(t){const n=this._clip(t);if(n)for(const e of this.delaunay.neighbors(t)){const t=this._clip(e);if(t)t:for(let r=0,i=n.length;r<i;r+=2)for(let o=0,a=t.length;o<a;o+=2)if(n[r]===t[o]&&n[r+1]===t[o+1]&&n[(r+2)%i]===t[(o+a-2)%a]&&n[(r+3)%i]===t[(o+a-1)%a]){yield e;break t}}}_cell(t){const{circumcenters:n,delaunay:{inedges:e,halfedges:r,triangles:i}}=this,o=e[t];if(-1===o)return null;const a=[];let u=o;do{const e=Math.floor(u/3);if(a.push(n[2*e],n[2*e+1]),u=u%3==2?u-2:u+1,i[u]!==t)break;u=r[u]}while(u!==o&&-1!==u);return a}_clip(t){if(0===t&&1===this.delaunay.hull.length)return[this.xmax,this.ymin,this.xmax,this.ymax,this.xmin,this.ymax,this.xmin,this.ymin];const n=this._cell(t);if(null===n)return null;const{vectors:e}=this,r=4*t;return this._simplify(e[r]||e[r+1]?this._clipInfinite(t,n,e[r],e[r+1],e[r+2],e[r+3]):this._clipFinite(t,n))}_clipFinite(t,n){const e=n.length;let r,i,o,a,u=null,c=n[e-2],f=n[e-1],s=this._regioncode(c,f),l=0;for(let h=0;h<e;h+=2)if(r=c,i=f,c=n[h],f=n[h+1],o=s,s=this._regioncode(c,f),0===o&&0===s)a=l,l=0,u?u.push(c,f):u=[c,f];else{let n,e,h,d,p;if(0===o){if(null===(n=this._clipSegment(r,i,c,f,o,s)))continue;[e,h,d,p]=n}else{if(null===(n=this._clipSegment(c,f,r,i,s,o)))continue;[d,p,e,h]=n,a=l,l=this._edgecode(e,h),a&&l&&this._edge(t,a,l,u,u.length),u?u.push(e,h):u=[e,h]}a=l,l=this._edgecode(d,p),a&&l&&this._edge(t,a,l,u,u.length),u?u.push(d,p):u=[d,p]}if(u)a=l,l=this._edgecode(u[0],u[1]),a&&l&&this._edge(t,a,l,u,u.length);else if(this.contains(t,(this.xmin+this.xmax)/2,(this.ymin+this.ymax)/2))return[this.xmax,this.ymin,this.xmax,this.ymax,this.xmin,this.ymax,this.xmin,this.ymin];return u}_clipSegment(t,n,e,r,i,o){const a=i<o;for(a&&([t,n,e,r,i,o]=[e,r,t,n,o,i]);;){if(0===i&&0===o)return a?[e,r,t,n]:[t,n,e,r];if(i&o)return null;let u,c,f=i||o;8&f?(u=t+(e-t)*(this.ymax-n)/(r-n),c=this.ymax):4&f?(u=t+(e-t)*(this.ymin-n)/(r-n),c=this.ymin):2&f?(c=n+(r-n)*(this.xmax-t)/(e-t),u=this.xmax):(c=n+(r-n)*(this.xmin-t)/(e-t),u=this.xmin),i?(t=u,n=c,i=this._regioncode(t,n)):(e=u,r=c,o=this._regioncode(e,r))}}_clipInfinite(t,n,e,r,i,o){let a,u=Array.from(n);if((a=this._project(u[0],u[1],e,r))&&u.unshift(a[0],a[1]),(a=this._project(u[u.length-2],u[u.length-1],i,o))&&u.push(a[0],a[1]),u=this._clipFinite(t,u))for(let n,e=0,r=u.length,i=this._edgecode(u[r-2],u[r-1]);e<r;e+=2)n=i,i=this._edgecode(u[e],u[e+1]),n&&i&&(e=this._edge(t,n,i,u,e),r=u.length);else this.contains(t,(this.xmin+this.xmax)/2,(this.ymin+this.ymax)/2)&&(u=[this.xmin,this.ymin,this.xmax,this.ymin,this.xmax,this.ymax,this.xmin,this.ymax]);return u}_edge(t,n,e,r,i){for(;n!==e;){let e,o;switch(n){case 5:n=4;continue;case 4:n=6,e=this.xmax,o=this.ymin;break;case 6:n=2;continue;case 2:n=10,e=this.xmax,o=this.ymax;break;case 10:n=8;continue;case 8:n=9,e=this.xmin,o=this.ymax;break;case 9:n=1;continue;case 1:n=5,e=this.xmin,o=this.ymin}r[i]===e&&r[i+1]===o||!this.contains(t,e,o)||(r.splice(i,0,e,o),i+=2)}return i}_project(t,n,e,r){let i,o,a,u=1/0;if(r<0){if(n<=this.ymin)return null;(i=(this.ymin-n)/r)<u&&(a=this.ymin,o=t+(u=i)*e)}else if(r>0){if(n>=this.ymax)return null;(i=(this.ymax-n)/r)<u&&(a=this.ymax,o=t+(u=i)*e)}if(e>0){if(t>=this.xmax)return null;(i=(this.xmax-t)/e)<u&&(o=this.xmax,a=n+(u=i)*r)}else if(e<0){if(t<=this.xmin)return null;(i=(this.xmin-t)/e)<u&&(o=this.xmin,a=n+(u=i)*r)}return[o,a]}_edgecode(t,n){return(t===this.xmin?1:t===this.xmax?2:0)|(n===this.ymin?4:n===this.ymax?8:0)}_regioncode(t,n){return(t<this.xmin?1:t>this.xmax?2:0)|(n<this.ymin?4:n>this.ymax?8:0)}_simplify(t){if(t&&t.length>4){for(let n=0;n<t.length;n+=2){const e=(n+2)%t.length,r=(n+4)%t.length;(t[n]===t[e]&&t[e]===t[r]||t[n+1]===t[e+1]&&t[e+1]===t[r+1])&&(t.splice(e,2),n-=2)}t.length||(t=null)}return t}}const Uu=2*Math.PI,Iu=Math.pow;function Ou(t){return t[0]}function Bu(t){return t[1]}function Yu(t,n,e){return[t+Math.sin(t+n)*e,n+Math.cos(t-n)*e]}class Lu{static from(t,n=Ou,e=Bu,r){return new Lu("length"in t?function(t,n,e,r){const i=t.length,o=new Float64Array(2*i);for(let a=0;a<i;++a){const i=t[a];o[2*a]=n.call(r,i,a,t),o[2*a+1]=e.call(r,i,a,t)}return o}(t,n,e,r):Float64Array.from(function*(t,n,e,r){let i=0;for(const o of t)yield n.call(r,o,i,t),yield e.call(r,o,i,t),++i}(t,n,e,r)))}constructor(t){this._delaunator=new Su(t),this.inedges=new Int32Array(t.length/2),this._hullIndex=new Int32Array(t.length/2),this.points=this._delaunator.coords,this._init()}update(){return this._delaunator.update(),this._init(),this}_init(){const t=this._delaunator,n=this.points;if(t.hull&&t.hull.length>2&&function(t){const{triangles:n,coords:e}=t;for(let t=0;t<n.length;t+=3){const 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arguments.length?n(Gm(t)):n()._curve},t}function Km(t,n){return[(n=+n)*Math.cos(t-=Math.PI/2),n*Math.sin(t)]}Xm.prototype={areaStart:function(){this._curve.areaStart()},areaEnd:function(){this._curve.areaEnd()},lineStart:function(){this._curve.lineStart()},lineEnd:function(){this._curve.lineEnd()},point:function(t,n){this._curve.point(n*Math.sin(t),n*-Math.cos(t))}};class Qm{constructor(t,n){this._context=t,this._x=n}areaStart(){this._line=0}areaEnd(){this._line=NaN}lineStart(){this._point=0}lineEnd(){(this._line||0!==this._line&&1===this._point)&&this._context.closePath(),this._line=1-this._line}point(t,n){switch(t=+t,n=+n,this._point){case 0:this._point=1,this._line?this._context.lineTo(t,n):this._context.moveTo(t,n);break;case 1:this._point=2;default:this._x?this._context.bezierCurveTo(this._x0=(this._x0+t)/2,this._y0,this._x0,n,t,n):this._context.bezierCurveTo(this._x0,this._y0=(this._y0+n)/2,t,this._y0,t,n)}this._x0=t,this._y0=n}}class Jm{constructor(t){this._context=t}lineStart(){this._point=0}lineEnd(){}point(t,n){if(t=+t,n=+n,0===this._point)this._point=1;else{const e=Km(this._x0,this._y0),r=Km(this._x0,this._y0=(this._y0+n)/2),i=Km(t,this._y0),o=Km(t,n);this._context.moveTo(...e),this._context.bezierCurveTo(...r,...i,...o)}this._x0=t,this._y0=n}}function tx(t){return new Qm(t,!0)}function nx(t){return new Qm(t,!1)}function ex(t){return new Jm(t)}function rx(t){return t.source}function ix(t){return t.target}function ox(t){let n=rx,e=ix,r=Im,i=Om,o=null,a=null,u=Nm(c);function c(){let c;const f=Rm.call(arguments),s=n.apply(this,f),l=e.apply(this,f);if(null==o&&(a=t(c=u())),a.lineStart(),f[0]=s,a.point(+r.apply(this,f),+i.apply(this,f)),f[0]=l,a.point(+r.apply(this,f),+i.apply(this,f)),a.lineEnd(),c)return a=null,c+""||null}return c.source=function(t){return arguments.length?(n=t,c):n},c.target=function(t){return arguments.length?(e=t,c):e},c.x=function(t){return arguments.length?(r="function"==typeof 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3:this.point(this._x2,this._y2),this.point(this._x3,this._y3),this.point(this._x4,this._y4)}},point:function(t,n){switch(t=+t,n=+n,this._point){case 0:this._point=1,this._x2=t,this._y2=n;break;case 1:this._point=2,this._x3=t,this._y3=n;break;case 2:this._point=3,this._x4=t,this._y4=n,this._context.moveTo((this._x0+4*this._x1+t)/6,(this._y0+4*this._y1+n)/6);break;default:Dx(this,t,n)}this._x0=this._x1,this._x1=t,this._y0=this._y1,this._y1=n}},qx.prototype={areaStart:function(){this._line=0},areaEnd:function(){this._line=NaN},lineStart:function(){this._x0=this._x1=this._y0=this._y1=NaN,this._point=0},lineEnd:function(){(this._line||0!==this._line&&3===this._point)&&this._context.closePath(),this._line=1-this._line},point:function(t,n){switch(t=+t,n=+n,this._point){case 0:this._point=1;break;case 1:this._point=2;break;case 2:this._point=3;var e=(this._x0+4*this._x1+t)/6,r=(this._y0+4*this._y1+n)/6;this._line?this._context.lineTo(e,r):this._context.moveTo(e,r);break;case 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mw(t,{sourceEvent:this.sourceEvent,target:v,type:t,transform:this.that.__zoom,dispatch:h}),n)}},v.wheelDelta=function(t){return arguments.length?(a="function"==typeof t?t:bw(+t),v):a},v.filter=function(t){return arguments.length?(r="function"==typeof t?t:bw(!!t),v):r},v.touchable=function(t){return arguments.length?(u="function"==typeof t?t:bw(!!t),v):u},v.extent=function(t){return arguments.length?(i="function"==typeof t?t:bw([[+t[0][0],+t[0][1]],[+t[1][0],+t[1][1]]]),v):i},v.scaleExtent=function(t){return arguments.length?(c[0]=+t[0],c[1]=+t[1],v):[c[0],c[1]]},v.translateExtent=function(t){return arguments.length?(f[0][0]=+t[0][0],f[1][0]=+t[1][0],f[0][1]=+t[0][1],f[1][1]=+t[1][1],v):[[f[0][0],f[0][1]],[f[1][0],f[1][1]]]},v.constrain=function(t){return arguments.length?(o=t,v):o},v.duration=function(t){return arguments.length?(s=+t,v):s},v.interpolate=function(t){return arguments.length?(l=t,v):l},v.on=function(){var t=h.on.apply(h,arguments);return t===h?v:t},v.clickDistance=function(t){return arguments.length?(g=(t=+t)*t,v):Math.sqrt(g)},v.tapDistance=function(t){return arguments.length?(y=+t,v):y},v},t.zoomIdentity=ww,t.zoomTransform=Mw}));
diff --git a/Lib/profiling/sampling/flamegraph.css b/Lib/profiling/sampling/flamegraph.css
new file mode 100644
index 00000000000000..9d470653170ccc
--- /dev/null
+++ b/Lib/profiling/sampling/flamegraph.css
@@ -0,0 +1,405 @@
+body {
+  font-family:
+    "Source Sans Pro", "Lucida Grande", "Lucida Sans Unicode", "Geneva",
+    "Verdana", sans-serif;
+  margin: 0;
+  padding: 0;
+  background: #ffffff;
+  color: #2e3338;
+  line-height: 1.6;
+}
+
+.header {
+  background: linear-gradient(135deg, #3776ab 0%, #4584bb 100%);
+  color: white;
+  padding: 32px 0;
+  box-shadow: 0 2px 10px rgba(55, 118, 171, 0.2);
+}
+
+.header-content {
+  max-width: 1200px;
+  margin: 0 auto;
+  padding: 0 24px;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  text-align: center;
+  gap: 20px;
+}
+
+.python-logo {
+  width: auto;
+  height: 72px;
+  margin-bottom: 12px; /* tighter spacing to avoid visual gap */
+  flex-shrink: 0;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.python-logo img {
+  height: 72px;
+  width: auto;
+  display: block; /* avoid baseline alignment issues */
+  vertical-align: middle;
+  /* subtle shadow that does not affect layout */
+  filter: drop-shadow(0 2px 6px rgba(0, 0, 0, 0.1));
+}
+
+.header-text h1 {
+  margin: 0;
+  font-size: 2.5em;
+  font-weight: 600;
+  color: white;
+  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
+}
+
+.header-text .subtitle {
+  margin: 8px 0 0 0;
+  font-size: 1.1em;
+  color: rgba(255, 255, 255, 0.9);
+  font-weight: 300;
+}
+
+.header-search {
+  width: 100%;
+  max-width: 500px;
+}
+
+.header-search #search-input {
+  width: 100%;
+  padding: 12px 20px;
+  border: 2px solid rgba(255, 255, 255, 0.2);
+  border-radius: 25px;
+  font-size: 16px;
+  font-family: inherit;
+  background: rgba(255, 255, 255, 0.95);
+  color: #2e3338;
+  transition: all 0.3s ease;
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
+  backdrop-filter: blur(10px);
+}
+
+.header-search #search-input:focus {
+  outline: none;
+  border-color: rgba(255, 255, 255, 0.8);
+  background: rgba(255, 255, 255, 1);
+  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
+  transform: translateY(-2px);
+}
+
+.header-search #search-input::placeholder {
+  color: #6c757d;
+}
+
+.stats-section {
+  background: #ffffff;
+  padding: 24px 0;
+  border-bottom: 1px solid #e9ecef;
+}
+
+.stats-container {
+  max-width: 1200px;
+  margin: 0 auto;
+  padding: 0 24px;
+  display: grid;
+  grid-template-columns: repeat(3, 1fr);
+  gap: 20px;
+}
+
+.stat-card {
+  background: #ffffff;
+  border: 1px solid #e9ecef;
+  border-radius: 12px;
+  padding: 20px;
+  display: flex;
+  align-items: flex-start;
+  gap: 16px;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
+  transition: all 0.2s ease;
+  min-height: 120px;
+}
+
+.stat-card:hover {
+  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
+  transform: translateY(-2px);
+}
+
+.stat-icon {
+  font-size: 32px;
+  width: 56px;
+  height: 56px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  background: linear-gradient(135deg, #3776ab 0%, #4584bb 100%);
+  border-radius: 50%;
+  flex-shrink: 0;
+  box-shadow: 0 2px 8px rgba(55, 118, 171, 0.3);
+}
+
+.stat-content {
+  flex: 1;
+}
+
+.stat-label {
+  font-size: 14px;
+  color: #5a6c7d;
+  font-weight: 500;
+  margin-bottom: 4px;
+  text-transform: uppercase;
+  letter-spacing: 0.5px;
+}
+
+.stat-value {
+  font-size: 16px;
+  font-weight: 700;
+  color: #2e3338;
+  line-height: 1.3;
+  margin-bottom: 4px;
+  word-break: break-word;
+  overflow-wrap: break-word;
+}
+
+.stat-file {
+  font-size: 12px;
+  color: #8b949e;
+  font-weight: 400;
+  margin-bottom: 2px;
+  font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
+  word-break: break-word;
+  overflow-wrap: break-word;
+}
+
+.stat-detail {
+  font-size: 12px;
+  color: #5a6c7d;
+  font-weight: 400;
+  line-height: 1.4;
+  font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
+  word-break: break-word;
+  overflow-wrap: break-word;
+}
+
+.controls {
+  background: #f8f9fa;
+  border-bottom: 1px solid #e9ecef;
+  padding: 20px 0;
+  text-align: center;
+}
+
+.controls-content {
+  max-width: 1200px;
+  margin: 0 auto;
+  padding: 0 24px;
+  text-align: center;
+}
+
+
+.controls button {
+  background: #3776ab;
+  color: white;
+  border: none;
+  padding: 12px 24px;
+  margin: 0 8px;
+  border-radius: 6px;
+  cursor: pointer;
+  font-weight: 600;
+  font-size: 14px;
+  font-family: inherit;
+  transition: all 0.2s ease;
+  box-shadow: 0 2px 4px rgba(55, 118, 171, 0.2);
+}
+
+.controls button:hover {
+  background: #2d5aa0;
+  transform: translateY(-1px);
+  box-shadow: 0 4px 8px rgba(55, 118, 171, 0.3);
+}
+
+.controls button.secondary {
+  background: #ffd43b;
+  color: #2e3338;
+}
+
+.controls button.secondary:hover {
+  background: #ffcd02;
+}
+
+#chart {
+  width: 100%;
+  height: calc(100vh - 160px);
+  overflow: hidden;
+  background: #ffffff;
+  padding: 0 40px;
+}
+
+.d3-flame-graph rect {
+  /* Prefer selector specificity instead of !important */
+  stroke: rgba(55, 118, 171, 0.3);
+  stroke-width: 1px;
+  cursor: pointer;
+  transition: all 0.1s ease;
+}
+
+.d3-flame-graph rect:hover {
+  stroke: #3776ab;
+  stroke-width: 2px;
+  filter: brightness(1.05);
+}
+
+.d3-flame-graph text {
+  /* Ensure labels use our font without !important */
+  font-family: "Source Sans Pro", sans-serif;
+  font-size: 12px;
+  font-weight: 500;
+  fill: #2e3338;
+  pointer-events: none;
+}
+
+.info-panel {
+  position: fixed;
+  bottom: 24px;
+  left: 84px; /* Leave space for the button */
+  background: white;
+  padding: 24px;
+  border-radius: 8px;
+  border: 1px solid #e9ecef;
+  font-size: 14px;
+  max-width: 280px;
+  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
+  z-index: 1000;
+  display: none;
+}
+
+.info-panel h3 {
+  margin: 0 0 16px 0;
+  color: #3776ab;
+  font-weight: 600;
+  font-size: 16px;
+  border-bottom: 2px solid #ffd43b;
+  padding-bottom: 8px;
+}
+
+.info-panel p {
+  margin: 12px 0;
+  color: #5a6c7d;
+  line-height: 1.5;
+}
+
+.info-panel strong {
+  color: #3776ab;
+}
+
+#show-info-btn {
+  position: fixed;
+  bottom: 32px;
+  left: 32px;
+  z-index: 1100;
+  width: 44px;
+  height: 44px;
+  border-radius: 50%;
+  background: #3776ab;
+  color: white;
+  border: none;
+  font-size: 24px;
+  box-shadow: 0 2px 8px rgba(55, 118, 171, 0.15);
+  cursor: pointer;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  transition: background 0.2s;
+}
+
+#show-info-btn:hover {
+  background: #2d5aa0;
+}
+
+#close-info-btn {
+  position: absolute;
+  top: 8px;
+  right: 12px;
+  background: none;
+  border: none;
+  font-size: 20px;
+  cursor: pointer;
+  color: #3776ab;
+}
+
+@media (max-width: 600px) {
+  .python-logo { height: 48px; }
+  .python-logo img { height: 48px; }
+  #show-info-btn {
+    left: 8px;
+    bottom: 8px;
+  }
+  .info-panel {
+    left: 60px; /* Still leave space for button */
+    bottom: 8px;
+    max-width: 90vw;
+  }
+}
+
+.legend-panel {
+  position: fixed;
+  top: 24px;
+  left: 24px;
+  background: white;
+  padding: 24px;
+  border-radius: 8px;
+  border: 1px solid #e9ecef;
+  font-size: 14px;
+  max-width: 320px;
+  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
+  display: none;
+  z-index: 1001;
+}
+
+.legend-panel h3 {
+  margin: 0 0 20px 0;
+  color: #3776ab;
+  font-weight: 600;
+  font-size: 18px;
+  text-align: center;
+  border-bottom: 2px solid #ffd43b;
+  padding-bottom: 8px;
+}
+
+.legend-item {
+  display: flex;
+  align-items: center;
+  margin: 12px 0;
+  padding: 10px;
+  border-radius: 6px;
+  background: #f8f9fa;
+  border: 1px solid #e9ecef;
+}
+
+.legend-color {
+  width: 28px;
+  height: 18px;
+  border-radius: 4px;
+  margin-right: 16px;
+  border: 1px solid rgba(0, 0, 0, 0.1);
+  flex-shrink: 0;
+}
+
+.legend-label {
+  color: #2e3338;
+  font-weight: 600;
+  flex: 1;
+}
+
+.legend-description {
+  color: #5a6c7d;
+  font-size: 12px;
+  margin-top: 2px;
+  font-weight: 400;
+}
+
+.chart-container {
+  background: #ffffff;
+  margin: 0;
+  padding: 12px 0;
+}
diff --git a/Lib/profiling/sampling/flamegraph.js b/Lib/profiling/sampling/flamegraph.js
new file mode 100644
index 00000000000000..27dff3b6854895
--- /dev/null
+++ b/Lib/profiling/sampling/flamegraph.js
@@ -0,0 +1,445 @@
+const EMBEDDED_DATA = {{FLAMEGRAPH_DATA}};
+
+// Python color palette - cold to hot
+const pythonColors = [
+  "#fff4bf", // Coldest - light yellow (<1%)
+  "#ffec9e", // Cold - yellow (1-3%)
+  "#ffe47d", // Cool - golden yellow (3-6%)
+  "#ffdc5c", // Medium - golden (6-12%)
+  "#ffd43b", // Warm - Python gold (12-18%)
+  "#5592cc", // Hot - light blue (18-35%)
+  "#4584bb", // Very hot - medium blue (35-60%)
+  "#3776ab", // Hottest - Python blue (≥60%)
+];
+
+function ensureLibraryLoaded() {
+  if (typeof flamegraph === "undefined") {
+    console.error("d3-flame-graph library not loaded");
+    document.getElementById("chart").innerHTML =
+      '<h2 style="text-align: center; color: #d32f2f;">Error: d3-flame-graph library failed to load</h2>';
+    throw new Error("d3-flame-graph library failed to load");
+  }
+}
+
+function createPythonTooltip(data) {
+  const pythonTooltip = flamegraph.tooltip.defaultFlamegraphTooltip();
+  pythonTooltip.show = function (d, element) {
+    if (!this._tooltip) {
+      this._tooltip = d3
+        .select("body")
+        .append("div")
+        .attr("class", "python-tooltip")
+        .style("position", "absolute")
+        .style("padding", "20px")
+        .style("background", "white")
+        .style("color", "#2e3338")
+        .style("border-radius", "8px")
+        .style("font-size", "14px")
+        .style("border", "1px solid #e9ecef")
+        .style("box-shadow", "0 8px 30px rgba(0, 0, 0, 0.15)")
+        .style("z-index", "1000")
+        .style("pointer-events", "none")
+        .style("font-weight", "400")
+        .style("line-height", "1.5")
+        .style("max-width", "500px")
+        .style("font-family", "'Source Sans Pro', sans-serif")
+        .style("opacity", 0);
+    }
+
+    const timeMs = (d.data.value / 1000).toFixed(2);
+    const percentage = ((d.data.value / data.value) * 100).toFixed(2);
+    const calls = d.data.calls || 0;
+    const childCount = d.children ? d.children.length : 0;
+    const source = d.data.source;
+
+    // Create source code section if available
+    let sourceSection = "";
+    if (source && Array.isArray(source) && source.length > 0) {
+      const sourceLines = source
+        .map(
+          (line) =>
+            `<div style="font-family: 'SF Mono', 'Monaco', 'Consolas', ` +
+            `monospace; font-size: 12px; color: ${
+              line.startsWith("→") ? "#3776ab" : "#5a6c7d"
+            }; white-space: pre; line-height: 1.4; padding: 2px 0;">${line
+              .replace(/&/g, "&amp;")
+              .replace(/</g, "&lt;")
+              .replace(/>/g, "&gt;")}</div>`,
+        )
+        .join("");
+
+      sourceSection = `
+        <div style="margin-top: 16px; padding-top: 12px;
+                    border-top: 1px solid #e9ecef;">
+          <div style="color: #3776ab; font-size: 13px;
+                      margin-bottom: 8px; font-weight: 600;">
+            Source Code:
+          </div>
+          <div style="background: #f8f9fa; border: 1px solid #e9ecef;
+                      border-radius: 6px; padding: 12px; max-height: 150px;
+                      overflow-y: auto;">
+            ${sourceLines}
+          </div>
+        </div>`;
+    } else if (source) {
+      // Show debug info if source exists but isn't an array
+      sourceSection = `
+        <div style="margin-top: 16px; padding-top: 12px;
+                    border-top: 1px solid #e9ecef;">
+          <div style="color: #d32f2f; font-size: 13px;
+                      margin-bottom: 8px; font-weight: 600;">
+            [Debug] - Source data type: ${typeof source}
+          </div>
+          <div style="background: #f8f9fa; border: 1px solid #e9ecef;
+                      border-radius: 6px; padding: 12px; max-height: 150px;
+                      overflow-y: auto; font-family: monospace; font-size: 11px;">
+            ${JSON.stringify(source, null, 2)}
+          </div>
+        </div>`;
+    }
+
+    const tooltipHTML = `
+      <div>
+        <div style="color: #3776ab; font-weight: 600; font-size: 16px;
+                    margin-bottom: 8px; line-height: 1.3;">
+          ${d.data.funcname || d.data.name}
+        </div>
+        <div style="color: #5a6c7d; font-size: 13px; margin-bottom: 12px;
+                    font-family: monospace; background: #f8f9fa;
+                    padding: 4px 8px; border-radius: 4px;">
+          ${d.data.filename || ""}${d.data.lineno ? ":" + d.data.lineno : ""}
+        </div>
+        <div style="display: grid; grid-template-columns: auto 1fr;
+                    gap: 8px 16px; font-size: 14px;">
+          <span style="color: #5a6c7d; font-weight: 500;">Execution Time:</span>
+          <strong style="color: #2e3338;">${timeMs} ms</strong>
+
+          <span style="color: #5a6c7d; font-weight: 500;">Percentage:</span>
+          <strong style="color: #3776ab;">${percentage}%</strong>
+
+          ${calls > 0 ? `
+            <span style="color: #5a6c7d; font-weight: 500;">Function Calls:</span>
+            <strong style="color: #2e3338;">${calls.toLocaleString()}</strong>
+          ` : ''}
+
+          ${childCount > 0 ? `
+            <span style="color: #5a6c7d; font-weight: 500;">Child Functions:</span>
+            <strong style="color: #2e3338;">${childCount}</strong>
+          ` : ''}
+        </div>
+        ${sourceSection}
+        <div style="margin-top: 16px; padding-top: 12px;
+                    border-top: 1px solid #e9ecef; font-size: 13px;
+                    color: #5a6c7d; text-align: center;">
+          ${childCount > 0 ?
+            "Click to focus on this function" :
+            "Leaf function - no children"}
+        </div>
+      </div>
+    `;
+
+    // Get mouse position
+    const event = d3.event || window.event;
+    const mouseX = event.pageX || event.clientX;
+    const mouseY = event.pageY || event.clientY;
+
+    // Calculate tooltip dimensions (default to 320px width if not rendered yet)
+    let tooltipWidth = 320;
+    let tooltipHeight = 200;
+    if (this._tooltip && this._tooltip.node()) {
+      const node = this._tooltip
+        .style("opacity", 0)
+        .style("display", "block")
+        .node();
+      tooltipWidth = node.offsetWidth || 320;
+      tooltipHeight = node.offsetHeight || 200;
+      this._tooltip.style("display", null);
+    }
+
+    // Calculate horizontal position: if overflow, show to the left of cursor
+    const padding = 10;
+    const rightEdge = mouseX + padding + tooltipWidth;
+    const viewportWidth = window.innerWidth;
+    let left;
+    if (rightEdge > viewportWidth) {
+      left = mouseX - tooltipWidth - padding;
+      if (left < 0) left = padding; // prevent off left edge
+    } else {
+      left = mouseX + padding;
+    }
+
+    // Calculate vertical position: if overflow, show above cursor
+    const bottomEdge = mouseY + padding + tooltipHeight;
+    const viewportHeight = window.innerHeight;
+    let top;
+    if (bottomEdge > viewportHeight) {
+      top = mouseY - tooltipHeight - padding;
+      if (top < 0) top = padding; // prevent off top edge
+    } else {
+      top = mouseY + padding;
+    }
+
+    this._tooltip
+      .html(tooltipHTML)
+      .style("left", left + "px")
+      .style("top", top + "px")
+      .transition()
+      .duration(200)
+      .style("opacity", 1);
+  };
+
+  // Override the hide method
+  pythonTooltip.hide = function () {
+    if (this._tooltip) {
+      this._tooltip.transition().duration(200).style("opacity", 0);
+    }
+  };
+  return pythonTooltip;
+}
+
+function createFlamegraph(tooltip, rootValue) {
+  let chart = flamegraph()
+    .width(window.innerWidth - 80)
+    .cellHeight(20)
+    .transitionDuration(300)
+    .minFrameSize(1)
+    .tooltip(tooltip)
+    .inverted(true)
+    .setColorMapper(function (d) {
+      const percentage = d.data.value / rootValue;
+      let colorIndex;
+      if (percentage >= 0.6) colorIndex = 7;
+      else if (percentage >= 0.35) colorIndex = 6;
+      else if (percentage >= 0.18) colorIndex = 5;
+      else if (percentage >= 0.12) colorIndex = 4;
+      else if (percentage >= 0.06) colorIndex = 3;
+      else if (percentage >= 0.03) colorIndex = 2;
+      else if (percentage >= 0.01) colorIndex = 1;
+      else colorIndex = 0; // <1%
+      return pythonColors[colorIndex];
+    });
+  return chart;
+}
+
+function renderFlamegraph(chart, data) {
+  d3.select("#chart").datum(data).call(chart);
+  window.flamegraphChart = chart; // for controls
+  window.flamegraphData = data;   // for resize/search
+  populateStats(data);
+}
+
+function attachPanelControls() {
+  const infoBtn = document.getElementById("show-info-btn");
+  const infoPanel = document.getElementById("info-panel");
+  const closeBtn = document.getElementById("close-info-btn");
+  if (infoBtn && infoPanel) {
+    infoBtn.addEventListener("click", function () {
+      const isOpen = infoPanel.style.display === "block";
+      infoPanel.style.display = isOpen ? "none" : "block";
+    });
+  }
+  if (closeBtn && infoPanel) {
+    closeBtn.addEventListener("click", function () {
+      infoPanel.style.display = "none";
+    });
+  }
+}
+
+function updateSearchHighlight(searchTerm, searchInput) {
+  d3.selectAll("#chart rect")
+    .style("stroke", null)
+    .style("stroke-width", null)
+    .style("opacity", null);
+  if (searchTerm && searchTerm.length > 0) {
+    d3.selectAll("#chart rect").style("opacity", 0.3);
+    let matchCount = 0;
+    d3.selectAll("#chart rect").each(function (d) {
+      if (d && d.data) {
+        const name = d.data.name || "";
+        const funcname = d.data.funcname || "";
+        const filename = d.data.filename || "";
+        const term = searchTerm.toLowerCase();
+        const matches =
+          name.toLowerCase().includes(term) ||
+          funcname.toLowerCase().includes(term) ||
+          filename.toLowerCase().includes(term);
+        if (matches) {
+          matchCount++;
+          d3.select(this)
+            .style("opacity", 1)
+            .style("stroke", "#ff6b35")
+            .style("stroke-width", "2px")
+            .style("stroke-dasharray", "3,3");
+        }
+      }
+    });
+    if (searchInput) {
+      if (matchCount > 0) {
+        searchInput.style.borderColor = "rgba(40, 167, 69, 0.8)";
+        searchInput.style.boxShadow = "0 6px 20px rgba(40, 167, 69, 0.2)";
+      } else {
+        searchInput.style.borderColor = "rgba(220, 53, 69, 0.8)";
+        searchInput.style.boxShadow = "0 6px 20px rgba(220, 53, 69, 0.2)";
+      }
+    }
+  } else if (searchInput) {
+    searchInput.style.borderColor = "rgba(255, 255, 255, 0.2)";
+    searchInput.style.boxShadow = "0 4px 12px rgba(0, 0, 0, 0.1)";
+  }
+}
+
+function initSearchHandlers() {
+  const searchInput = document.getElementById("search-input");
+  if (!searchInput) return;
+  let searchTimeout;
+  function performSearch() {
+    const term = searchInput.value.trim();
+    updateSearchHighlight(term, searchInput);
+  }
+  searchInput.addEventListener("input", function () {
+    clearTimeout(searchTimeout);
+    searchTimeout = setTimeout(performSearch, 150);
+  });
+  window.performSearch = performSearch;
+}
+
+function handleResize(chart, data) {
+  window.addEventListener("resize", function () {
+    if (chart && data) {
+      const newWidth = window.innerWidth - 80;
+      chart.width(newWidth);
+      d3.select("#chart").datum(data).call(chart);
+    }
+  });
+}
+
+function initFlamegraph() {
+  ensureLibraryLoaded();
+  const tooltip = createPythonTooltip(EMBEDDED_DATA);
+  const chart = createFlamegraph(tooltip, EMBEDDED_DATA.value);
+  renderFlamegraph(chart, EMBEDDED_DATA);
+  attachPanelControls();
+  initSearchHandlers();
+  handleResize(chart, EMBEDDED_DATA);
+}
+
+if (document.readyState === "loading") {
+  document.addEventListener("DOMContentLoaded", initFlamegraph);
+} else {
+  initFlamegraph();
+}
+
+function populateStats(data) {
+  const totalSamples = data.value || 0;
+
+  // Collect all functions with their metrics, aggregated by function name
+  const functionMap = new Map();
+
+  function collectFunctions(node) {
+    if (node.filename && node.funcname) {
+      // Calculate direct samples (this node's value minus children's values)
+      let childrenValue = 0;
+      if (node.children) {
+        childrenValue = node.children.reduce((sum, child) => sum + child.value, 0);
+      }
+      const directSamples = Math.max(0, node.value - childrenValue);
+
+      // Use file:line:funcname as key to ensure uniqueness
+      const funcKey = `${node.filename}:${node.lineno || '?'}:${node.funcname}`;
+
+      if (functionMap.has(funcKey)) {
+        const existing = functionMap.get(funcKey);
+        existing.directSamples += directSamples;
+        existing.directPercent = (existing.directSamples / totalSamples) * 100;
+        // Keep the most representative file/line (the one with more samples)
+        if (directSamples > existing.maxSingleSamples) {
+          existing.filename = node.filename;
+          existing.lineno = node.lineno || '?';
+          existing.maxSingleSamples = directSamples;
+        }
+      } else {
+        functionMap.set(funcKey, {
+          filename: node.filename,
+          lineno: node.lineno || '?',
+          funcname: node.funcname,
+          directSamples,
+          directPercent: (directSamples / totalSamples) * 100,
+          maxSingleSamples: directSamples
+        });
+      }
+    }
+
+    if (node.children) {
+      node.children.forEach(child => collectFunctions(child));
+    }
+  }
+
+  collectFunctions(data);
+
+  // Convert map to array and get top 3 hotspots
+  const hotSpots = Array.from(functionMap.values())
+    .filter(f => f.directPercent > 0.5) // At least 0.5% to be significant
+    .sort((a, b) => b.directPercent - a.directPercent)
+    .slice(0, 3);
+
+  // Populate the 3 cards
+  for (let i = 0; i < 3; i++) {
+    const num = i + 1;
+    if (i < hotSpots.length) {
+      const hotspot = hotSpots[i];
+      const basename = hotspot.filename.split('/').pop();
+      let funcDisplay = hotspot.funcname;
+      if (funcDisplay.length > 35) {
+        funcDisplay = funcDisplay.substring(0, 32) + '...';
+      }
+
+      document.getElementById(`hotspot-file-${num}`).textContent = `${basename}:${hotspot.lineno}`;
+      document.getElementById(`hotspot-func-${num}`).textContent = funcDisplay;
+      document.getElementById(`hotspot-detail-${num}`).textContent = `${hotspot.directPercent.toFixed(1)}% samples (${hotspot.directSamples.toLocaleString()})`;
+    } else {
+      document.getElementById(`hotspot-file-${num}`).textContent = '--';
+      document.getElementById(`hotspot-func-${num}`).textContent = '--';
+      document.getElementById(`hotspot-detail-${num}`).textContent = '--';
+    }
+  }
+}
+
+// Control functions
+function resetZoom() {
+  if (window.flamegraphChart) {
+    window.flamegraphChart.resetZoom();
+  }
+}
+
+function exportSVG() {
+  const svgElement = document.querySelector("#chart svg");
+  if (svgElement) {
+    const serializer = new XMLSerializer();
+    const svgString = serializer.serializeToString(svgElement);
+    const blob = new Blob([svgString], { type: "image/svg+xml" });
+    const url = URL.createObjectURL(blob);
+    const a = document.createElement("a");
+    a.href = url;
+    a.download = "python-performance-flamegraph.svg";
+    a.click();
+    URL.revokeObjectURL(url);
+  }
+}
+
+function toggleLegend() {
+  const legendPanel = document.getElementById("legend-panel");
+  const isHidden =
+    legendPanel.style.display === "none" || legendPanel.style.display === "";
+  legendPanel.style.display = isHidden ? "block" : "none";
+}
+
+function clearSearch() {
+  const searchInput = document.getElementById("search-input");
+  if (searchInput) {
+    searchInput.value = "";
+    if (window.flamegraphChart) {
+      window.flamegraphChart.clear();
+    }
+  }
+}
+
diff --git a/Lib/profiling/sampling/flamegraph_template.html b/Lib/profiling/sampling/flamegraph_template.html
new file mode 100644
index 00000000000000..358791e80ce0cf
--- /dev/null
+++ b/Lib/profiling/sampling/flamegraph_template.html
@@ -0,0 +1,147 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Python Performance Flamegraph</title>
+    <!-- INLINE_VENDOR_D3_JS -->
+    <!-- INLINE_VENDOR_FLAMEGRAPH_CSS -->
+    <!-- INLINE_VENDOR_FLAMEGRAPH_JS -->
+    <!-- INLINE_VENDOR_FLAMEGRAPH_TOOLTIP_JS -->
+    <!-- INLINE_CSS -->
+  </head>
+  <body>
+    <div class="header">
+      <div class="header-content">
+        <div class="python-logo"><!-- INLINE_LOGO --></div>
+        <div class="header-text">
+          <h1>Tachyon Profiler Performance Flamegraph</h1>
+          <div class="subtitle">
+            Interactive visualization of function call performance
+          </div>
+        </div>
+        <div class="header-search">
+          <input type="text" id="search-input" placeholder="🔍 Search functions..." />
+        </div>
+      </div>
+    </div>
+
+    <div class="stats-section">
+      <div class="stats-container">
+        <div class="stat-card hotspot-card">
+          <div class="stat-icon">🥇</div>
+          <div class="stat-content">
+            <div class="stat-label">#1 Hot Spot</div>
+            <div class="stat-file" id="hotspot-file-1">--</div>
+            <div class="stat-value" id="hotspot-func-1">--</div>
+            <div class="stat-detail" id="hotspot-detail-1">--</div>
+          </div>
+        </div>
+        <div class="stat-card hotspot-card">
+          <div class="stat-icon">🥈</div>
+          <div class="stat-content">
+            <div class="stat-label">#2 Hot Spot</div>
+            <div class="stat-file" id="hotspot-file-2">--</div>
+            <div class="stat-value" id="hotspot-func-2">--</div>
+            <div class="stat-detail" id="hotspot-detail-2">--</div>
+          </div>
+        </div>
+        <div class="stat-card hotspot-card">
+          <div class="stat-icon">🥉</div>
+          <div class="stat-content">
+            <div class="stat-label">#3 Hot Spot</div>
+            <div class="stat-file" id="hotspot-file-3">--</div>
+            <div class="stat-value" id="hotspot-func-3">--</div>
+            <div class="stat-detail" id="hotspot-detail-3">--</div>
+          </div>
+        </div>
+      </div>
+    </div>
+
+    <div class="controls">
+      <div class="controls-content">
+        <button onclick="resetZoom()">🏠 Reset Zoom</button>
+        <button onclick="exportSVG()" class="secondary">📁 Export SVG</button>
+        <button onclick="toggleLegend()">🔥 Heat Map Legend</button>
+      </div>
+    </div>
+
+    <button id="show-info-btn" title="Show navigation guide">&#8505;</button>
+
+    <div class="info-panel" id="info-panel">
+      <button id="close-info-btn" title="Close">&times;</button>
+      <h3>Navigation Guide</h3>
+      <p><strong>Click:</strong> Zoom into function</p>
+      <p><strong>Hover:</strong> Show detailed information</p>
+      <p><strong>Width:</strong> Time spent in function</p>
+      <p><strong>Height:</strong> Call stack depth</p>
+      <p><strong>Color:</strong> Performance intensity</p>
+    </div>
+
+    <div class="legend-panel" id="legend-panel">
+      <h3>🔥 Performance Heat Map</h3>
+      <div class="legend-item">
+        <div class="legend-color" style="background-color: #3776ab"></div>
+        <div>
+          <div class="legend-label">Hottest Functions (≥60%)</div>
+          <div class="legend-description">Highest performance impact</div>
+        </div>
+      </div>
+      <div class="legend-item">
+        <div class="legend-color" style="background-color: #4584bb"></div>
+        <div>
+          <div class="legend-label">Very Hot Functions (35-60%)</div>
+          <div class="legend-description">High performance impact</div>
+        </div>
+      </div>
+      <div class="legend-item">
+        <div class="legend-color" style="background-color: #5592cc"></div>
+        <div>
+          <div class="legend-label">Hot Functions (18-35%)</div>
+          <div class="legend-description">Notable performance cost</div>
+        </div>
+      </div>
+      <div class="legend-item">
+        <div class="legend-color" style="background-color: #ffd43b"></div>
+        <div>
+          <div class="legend-label">Warm Functions (12-18%)</div>
+          <div class="legend-description">Moderate impact</div>
+        </div>
+      </div>
+      <div class="legend-item">
+        <div class="legend-color" style="background-color: #ffdc5c"></div>
+        <div>
+          <div class="legend-label">Medium Functions (6-12%)</div>
+          <div class="legend-description">Some performance impact</div>
+        </div>
+      </div>
+      <div class="legend-item">
+        <div class="legend-color" style="background-color: #ffe47d"></div>
+        <div>
+          <div class="legend-label">Cool Functions (3-6%)</div>
+          <div class="legend-description">Low performance impact</div>
+        </div>
+      </div>
+      <div class="legend-item">
+        <div class="legend-color" style="background-color: #ffec9e"></div>
+        <div>
+          <div class="legend-label">Cold Functions (1-3%)</div>
+          <div class="legend-description">Minimal performance impact</div>
+        </div>
+      </div>
+      <div class="legend-item">
+        <div class="legend-color" style="background-color: #fff4bf"></div>
+        <div>
+          <div class="legend-label">Coldest Functions (<1%)</div>
+          <div class="legend-description">Very low performance impact</div>
+        </div>
+      </div>
+    </div>
+
+    <div class="chart-container">
+      <div id="chart"></div>
+    </div>
+
+    <!-- INLINE_JS -->
+  </body>
+</html>
diff --git a/Lib/profiling/sampling/sample.py b/Lib/profiling/sampling/sample.py
index 929a92e1dda3b2..8a65f312234730 100644
--- a/Lib/profiling/sampling/sample.py
+++ b/Lib/profiling/sampling/sample.py
@@ -12,17 +12,20 @@
 from _colorize import ANSIColors
 
 from .pstats_collector import PstatsCollector
-from .stack_collector import CollapsedStackCollector
+from .stack_collector import CollapsedStackCollector, FlamegraphCollector
 
 _FREE_THREADED_BUILD = sysconfig.get_config_var("Py_GIL_DISABLED") is not None
-_MAX_STARTUP_ATTEMPTS = 5
-_STARTUP_RETRY_DELAY_SECONDS = 0.1
 _HELP_DESCRIPTION = """Sample a process's stack frames and generate profiling data.
 Supports the following target modes:
   - -p PID: Profile an existing process by PID
   - -m MODULE [ARGS...]: Profile a module as python -m module ...
   - filename [ARGS...]: Profile the specified script by running it in a subprocess
 
+Supports the following output formats:
+  - --pstats: Detailed profiling statistics with sorting options
+  - --collapsed: Stack traces for generating flamegraphs
+  - --flamegraph Interactive HTML flamegraph visualization (requires web browser)
+
 Examples:
   # Profile process 1234 for 10 seconds with default settings
   python -m profiling.sampling -p 1234
@@ -39,6 +42,9 @@
   # Generate collapsed stacks for flamegraph
   python -m profiling.sampling --collapsed -p 1234
 
+  # Generate a HTML flamegraph
+  python -m profiling.sampling --flamegraph -p 1234
+
   # Profile all threads, sort by total time
   python -m profiling.sampling -a --sort-tottime -p 1234
 
@@ -185,9 +191,16 @@ def sample(self, collector, duration_sec=10):
         if self.realtime_stats and len(self.sample_intervals) > 0:
             print()  # Add newline after real-time stats
 
+        sample_rate = num_samples / running_time
+        error_rate = (errors / num_samples) * 100 if num_samples > 0 else 0
+
         print(f"Captured {num_samples} samples in {running_time:.2f} seconds")
-        print(f"Sample rate: {num_samples / running_time:.2f} samples/sec")
-        print(f"Error rate: {(errors / num_samples) * 100:.2f}%")
+        print(f"Sample rate: {sample_rate:.2f} samples/sec")
+        print(f"Error rate: {error_rate:.2f}%")
+
+        # Pass stats to flamegraph collector if it's the right type
+        if hasattr(collector, 'set_stats'):
+            collector.set_stats(self.sample_interval_usec, running_time, sample_rate, error_rate)
 
         expected_samples = int(duration_sec / sample_interval_sec)
         if num_samples < expected_samples:
@@ -596,6 +609,9 @@ def sample(
         case "collapsed":
             collector = CollapsedStackCollector()
             filename = filename or f"collapsed.{pid}.txt"
+        case "flamegraph":
+            collector = FlamegraphCollector()
+            filename = filename or f"flamegraph.{pid}.html"
         case _:
             raise ValueError(f"Invalid output format: {output_format}")
 
@@ -728,12 +744,20 @@ def main():
         dest="format",
         help="Generate collapsed stack traces for flamegraphs",
     )
+    output_format.add_argument(
+        "--flamegraph",
+        action="store_const",
+        const="flamegraph",
+        dest="format",
+        help="Generate HTML flamegraph visualization",
+    )
 
     output_group.add_argument(
         "-o",
         "--outfile",
         help="Save output to a file (if omitted, prints to stdout for pstats, "
-        "or saves to collapsed.<pid>.txt for collapsed format)",
+        "or saves to collapsed.<pid>.txt or flamegraph.<pid>.html for the "
+        "respective output formats)"
     )
 
     # pstats-specific options
diff --git a/Lib/profiling/sampling/stack_collector.py b/Lib/profiling/sampling/stack_collector.py
index 270b6871980fb8..9df8111c451de8 100644
--- a/Lib/profiling/sampling/stack_collector.py
+++ b/Lib/profiling/sampling/stack_collector.py
@@ -1,4 +1,9 @@
+import base64
 import collections
+import functools
+import importlib.resources
+import json
+import linecache
 import os
 
 from .collector import Collector
@@ -41,3 +46,229 @@ def export(self, filename):
             for stack, count in stack_counter.items():
                 f.write(f"{stack} {count}\n")
         print(f"Collapsed stack output written to {filename}")
+
+
+class FlamegraphCollector(StackTraceCollector):
+    def __init__(self):
+        super().__init__()
+        self.stats = {}
+
+    def set_stats(self, sample_interval_usec, duration_sec, sample_rate, error_rate=None):
+        """Set profiling statistics to include in flamegraph data."""
+        self.stats = {
+            "sample_interval_usec": sample_interval_usec,
+            "duration_sec": duration_sec,
+            "sample_rate": sample_rate,
+            "error_rate": error_rate
+        }
+
+    def export(self, filename):
+        flamegraph_data = self._convert_to_flamegraph_format()
+
+        # Debug output
+        num_functions = len(flamegraph_data.get("children", []))
+        total_time = flamegraph_data.get("value", 0)
+        print(
+            f"Flamegraph data: {num_functions} root functions, total samples: {total_time}"
+        )
+
+        if num_functions == 0:
+            print(
+                "Warning: No functions found in profiling data. Check if sampling captured any data."
+            )
+            return
+
+        html_content = self._create_flamegraph_html(flamegraph_data)
+
+        with open(filename, "w", encoding="utf-8") as f:
+            f.write(html_content)
+
+        print(f"Flamegraph saved to: {filename}")
+
+    @functools.lru_cache(maxsize=None)
+    def _format_function_name(self, func):
+        filename, lineno, funcname = func
+
+        if len(filename) > 50:
+            parts = filename.split("/")
+            if len(parts) > 2:
+                filename = f".../{'/'.join(parts[-2:])}"
+
+        return f"{funcname} ({filename}:{lineno})"
+
+    def _convert_to_flamegraph_format(self):
+        """Convert call trees to d3-flamegraph format with optimized hierarchy building"""
+        if not self.call_trees:
+            return {"name": "No Data", "value": 0, "children": []}
+
+        unique_functions = set()
+        for call_tree in self.call_trees:
+            unique_functions.update(call_tree)
+
+        func_to_name = {
+            func: self._format_function_name(func) for func in unique_functions
+        }
+
+        root = {"name": "root", "children": {}, "samples": 0}
+
+        for call_tree in self.call_trees:
+            current_node = root
+            current_node["samples"] += 1
+
+            for func in call_tree:
+                func_name = func_to_name[func]  # Use pre-computed name
+
+                if func_name not in current_node["children"]:
+                    current_node["children"][func_name] = {
+                        "name": func_name,
+                        "func": func,
+                        "children": {},
+                        "samples": 0,
+                        "filename": func[0],
+                        "lineno": func[1],
+                        "funcname": func[2],
+                    }
+
+                current_node = current_node["children"][func_name]
+                current_node["samples"] += 1
+
+        def convert_node(node, min_samples=1):
+            if node["samples"] < min_samples:
+                return None
+
+            source_code = None
+            if "func" in node:
+                source_code = self._get_source_lines(node["func"])
+
+            result = {
+                "name": node["name"],
+                "value": node["samples"],
+                "children": [],
+            }
+
+            if "filename" in node:
+                result.update(
+                    {
+                        "filename": node["filename"],
+                        "lineno": node["lineno"],
+                        "funcname": node["funcname"],
+                    }
+                )
+
+            if source_code:
+                result["source"] = source_code
+
+            # Recursively convert children
+            child_nodes = []
+            for child_name, child_node in node["children"].items():
+                child_result = convert_node(child_node, min_samples)
+                if child_result:
+                    child_nodes.append(child_result)
+
+            # Sort children by sample count (descending)
+            child_nodes.sort(key=lambda x: x["value"], reverse=True)
+            result["children"] = child_nodes
+
+            return result
+
+        # Filter out very small functions (less than 0.1% of total samples)
+        total_samples = len(self.call_trees)
+        min_samples = max(1, int(total_samples * 0.001))
+
+        converted_root = convert_node(root, min_samples)
+
+        if not converted_root or not converted_root["children"]:
+            return {"name": "No significant data", "value": 0, "children": []}
+
+        # If we only have one root child, make it the root to avoid redundant level
+        if len(converted_root["children"]) == 1:
+            main_child = converted_root["children"][0]
+            main_child["name"] = f"Program Root: {main_child['name']}"
+            main_child["stats"] = self.stats
+            return main_child
+
+        converted_root["name"] = "Program Root"
+        converted_root["stats"] = self.stats
+        return converted_root
+
+    def _get_source_lines(self, func):
+        filename, lineno, funcname = func
+
+        try:
+            # Get several lines around the function definition
+            lines = []
+            start_line = max(1, lineno - 2)
+            end_line = lineno + 3
+
+            for line_num in range(start_line, end_line):
+                line = linecache.getline(filename, line_num)
+                if line.strip():
+                    marker = "→ " if line_num == lineno else "  "
+                    lines.append(f"{marker}{line_num}: {line.rstrip()}")
+
+            return lines if lines else None
+
+        except Exception:
+            # If we can't get source code, return None
+            return None
+
+    def _create_flamegraph_html(self, data):
+        data_json = json.dumps(data)
+
+        template_dir = importlib.resources.files(__package__)
+        vendor_dir = template_dir / "_vendor"
+        assets_dir = template_dir / "_assets"
+
+        d3_path = vendor_dir / "d3" / "7.8.5" / "d3.min.js"
+        d3_flame_graph_dir = vendor_dir /  "d3-flame-graph" / "4.1.3"
+        fg_css_path = d3_flame_graph_dir / "d3-flamegraph.css"
+        fg_js_path = d3_flame_graph_dir / "d3-flamegraph.min.js"
+        fg_tooltip_js_path = d3_flame_graph_dir / "d3-flamegraph-tooltip.min.js"
+
+        html_template = (template_dir / "flamegraph_template.html").read_text(encoding="utf-8")
+        css_content = (template_dir / "flamegraph.css").read_text(encoding="utf-8")
+        js_content = (template_dir / "flamegraph.js").read_text(encoding="utf-8")
+
+        # Inline first-party CSS/JS
+        html_template = html_template.replace(
+            "<!-- INLINE_CSS -->", f"<style>\n{css_content}\n</style>"
+        )
+        html_template = html_template.replace(
+            "<!-- INLINE_JS -->", f"<script>\n{js_content}\n</script>"
+        )
+
+        png_path = assets_dir / "python-logo-only.png"
+        b64_logo = base64.b64encode(png_path.read_bytes()).decode("ascii")
+
+        # Let CSS control size; keep markup simple
+        logo_html = f'<img src="data:image/png;base64,{b64_logo}" alt="Python logo"/>'
+        html_template = html_template.replace("<!-- INLINE_LOGO -->", logo_html)
+
+        d3_js = d3_path.read_text(encoding="utf-8")
+        fg_css = fg_css_path.read_text(encoding="utf-8")
+        fg_js = fg_js_path.read_text(encoding="utf-8")
+        fg_tooltip_js = fg_tooltip_js_path.read_text(encoding="utf-8")
+
+        html_template = html_template.replace(
+            "<!-- INLINE_VENDOR_D3_JS -->",
+            f"<script>\n{d3_js}\n</script>",
+        )
+        html_template = html_template.replace(
+            "<!-- INLINE_VENDOR_FLAMEGRAPH_CSS -->",
+            f"<style>\n{fg_css}\n</style>",
+        )
+        html_template = html_template.replace(
+            "<!-- INLINE_VENDOR_FLAMEGRAPH_JS -->",
+            f"<script>\n{fg_js}\n</script>",
+        )
+        html_template = html_template.replace(
+            "<!-- INLINE_VENDOR_FLAMEGRAPH_TOOLTIP_JS -->",
+            f"<script>\n{fg_tooltip_js}\n</script>",
+        )
+
+        # Replace the placeholder with actual data
+        html_content = html_template.replace(
+            "{{FLAMEGRAPH_DATA}}", data_json
+        )
+
+        return html_content
diff --git a/Lib/test/test_profiling/test_sampling_profiler.py b/Lib/test/test_profiling/test_sampling_profiler.py
index 1f369c50094ca8..84339d46d02f73 100644
--- a/Lib/test/test_profiling/test_sampling_profiler.py
+++ b/Lib/test/test_profiling/test_sampling_profiler.py
@@ -15,6 +15,7 @@
 from profiling.sampling.pstats_collector import PstatsCollector
 from profiling.sampling.stack_collector import (
     CollapsedStackCollector,
+    FlamegraphCollector,
 )
 
 from test.support.os_helper import unlink
@@ -436,6 +437,88 @@ def test_collapsed_stack_collector_export(self):
         self.assertIn(stack1_expected, lines)
         self.assertIn(stack2_expected, lines)
 
+    def test_flamegraph_collector_basic(self):
+        """Test basic FlamegraphCollector functionality."""
+        collector = FlamegraphCollector()
+
+        # Test empty state (inherits from StackTraceCollector)
+        self.assertEqual(len(collector.call_trees), 0)
+        self.assertEqual(len(collector.function_samples), 0)
+
+        # Test collecting sample data
+        test_frames = [
+            MockInterpreterInfo(
+                0,
+                [MockThreadInfo(1, [("file.py", 10, "func1"), ("file.py", 20, "func2")])],
+            )
+        ]
+        collector.collect(test_frames)
+
+        # Should store call tree (reversed)
+        self.assertEqual(len(collector.call_trees), 1)
+        expected_tree = [("file.py", 20, "func2"), ("file.py", 10, "func1")]
+        self.assertEqual(collector.call_trees[0], expected_tree)
+
+        # Should count function samples
+        self.assertEqual(
+            collector.function_samples[("file.py", 10, "func1")], 1
+        )
+        self.assertEqual(
+            collector.function_samples[("file.py", 20, "func2")], 1
+        )
+
+    def test_flamegraph_collector_export(self):
+        """Test flamegraph HTML export functionality."""
+        flamegraph_out = tempfile.NamedTemporaryFile(
+            suffix=".html", delete=False
+        )
+        self.addCleanup(close_and_unlink, flamegraph_out)
+
+        collector = FlamegraphCollector()
+
+        # Create some test data (use Interpreter/Thread objects like runtime)
+        test_frames1 = [
+            MockInterpreterInfo(
+                0,
+                [MockThreadInfo(1, [("file.py", 10, "func1"), ("file.py", 20, "func2")])],
+            )
+        ]
+        test_frames2 = [
+            MockInterpreterInfo(
+                0,
+                [MockThreadInfo(1, [("file.py", 10, "func1"), ("file.py", 20, "func2")])],
+            )
+        ]  # Same stack
+        test_frames3 = [
+            MockInterpreterInfo(0, [MockThreadInfo(1, [("other.py", 5, "other_func")])])
+        ]
+
+        collector.collect(test_frames1)
+        collector.collect(test_frames2)
+        collector.collect(test_frames3)
+
+        # Export flamegraph
+        collector.export(flamegraph_out.name)
+
+        # Verify file was created and contains valid data
+        self.assertTrue(os.path.exists(flamegraph_out.name))
+        self.assertGreater(os.path.getsize(flamegraph_out.name), 0)
+
+        # Check file contains HTML content
+        with open(flamegraph_out.name, "r", encoding="utf-8") as f:
+            content = f.read()
+
+        # Should be valid HTML
+        self.assertIn("<!doctype html>", content.lower())
+        self.assertIn("<html", content)
+        self.assertIn("Python Performance Flamegraph", content)
+        self.assertIn("d3-flame-graph", content)
+
+        # Should contain the data
+        self.assertIn('"name":', content)
+        self.assertIn('"value":', content)
+        self.assertIn('"children":', content)
+
     def test_pstats_collector_export(self):
         collector = PstatsCollector(
             sample_interval_usec=1000000
@@ -1824,6 +1907,27 @@ def test_esrch_signal_handling(self):
             with self.assertRaises(ProcessLookupError):
                 unwinder.get_stack_trace()
 
+    def test_valid_output_formats(self):
+        """Test that all valid output formats are accepted."""
+        valid_formats = ["pstats", "collapsed", "flamegraph"]
+
+        tempdir = tempfile.TemporaryDirectory(delete=False)
+        self.addCleanup(shutil.rmtree, tempdir.name)
+
+
+        with contextlib.chdir(tempdir.name):
+            for fmt in valid_formats:
+                try:
+                    # This will likely fail with permissions, but the format should be valid
+                    profiling.sampling.sample.sample(
+                        os.getpid(),
+                        duration_sec=0.1,
+                        output_format=fmt,
+                        filename=f"test_{fmt}.out",
+                    )
+                except (OSError, RuntimeError, PermissionError):
+                    # Expected errors - we just want to test format validation
+                    pass
 
 
 class TestSampleProfilerCLI(unittest.TestCase):
diff --git a/Makefile.pre.in b/Makefile.pre.in
index edc6c5aa812e27..34bd4540efb0b8 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -2566,6 +2566,9 @@ LIBSUBDIRS=	asyncio \
 		pathlib \
 		profile \
 		profiling profiling/sampling profiling/tracing \
+		profiling/sampling/_assets \
+		profiling/sampling/_vendor/d3/7.8.5 \
+		profiling/sampling/_vendor/d3-flame-graph/4.1.3 \
 		pydoc_data \
 		re \
 		site-packages \