Remove 3.9 support from CI and tests (#15401)

Author: srittau

.github/workflows/daily.yml

@@ -35,7 +35,7 @@ jobs:
     strategy:
       matrix:
         os: ["ubuntu-latest", "windows-latest", "macos-latest"]
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
+        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
       fail-fast: false
 
     steps:

.github/workflows/meta_tests.yml

@@ -65,7 +65,7 @@ jobs:
         with:
           version: PATH
           python-platform: ${{ matrix.python-platform }}
-          python-version: "3.9" # Oldest version supported for running scripts and tests
+          python-version: "3.10" # Oldest version supported for running scripts and tests
           project: ./pyrightconfig.scripts_and_tests.json
   stubsabot-dry-run:
     name: Stubsabot dry run

.github/workflows/stubtest_stdlib.yml

@@ -31,7 +31,7 @@ jobs:
     strategy:
       matrix:
         os: ["ubuntu-latest", "windows-latest", "macos-latest"]
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
+        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
       fail-fast: false
 
     steps:

.github/workflows/tests.yml

@@ -42,7 +42,7 @@ jobs:
     strategy:
       matrix:
         platform: ["linux", "win32", "darwin"]
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
+        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
       fail-fast: false
     steps:
       - uses: actions/checkout@v6
@@ -84,7 +84,7 @@ jobs:
     strategy:
       matrix:
         python-platform: ["Linux", "Windows", "Darwin"]
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
+        python-version: ["3.11", "3.12", "3.13", "3.14"]
       fail-fast: false
     steps:
       - uses: actions/checkout@v6

tests/mypy_test.py

@@ -44,7 +44,7 @@
     print_error("Cannot import mypy. Did you install it?")
     sys.exit(1)
 
-SUPPORTED_VERSIONS = ["3.14", "3.13", "3.12", "3.11", "3.10", "3.9"]
+SUPPORTED_VERSIONS = ["3.14", "3.13", "3.12", "3.11", "3.10"]
 SUPPORTED_PLATFORMS = ("linux", "win32", "darwin")
 DIRECTORIES_TO_TEST = [STDLIB_PATH, STUBS_PATH]
 

tests/regr_test.py

@@ -41,7 +41,7 @@
 TYPESHED = "typeshed"
 
 SUPPORTED_PLATFORMS = ["linux", "darwin", "win32"]
-SUPPORTED_VERSIONS = ["3.14", "3.13", "3.12", "3.11", "3.10", "3.9"]
+SUPPORTED_VERSIONS = ["3.14", "3.13", "3.12", "3.11", "3.10"]
 
 
 def distribution_with_test_cases(distribution_name: str) -> DistributionTests:

tests/runtests.py

@@ -50,7 +50,7 @@ def main() -> None:
     parser.add_argument(
         "--python-version",
         default=None,
-        choices=("3.9", "3.10", "3.11", "3.12", "3.13", "3.14"),
+        choices=("3.10", "3.11", "3.12", "3.13", "3.14"),
         # We're using the oldest fully supported version because it's the most likely to produce errors
         # due to unsupported syntax, feature, or bug in a tool.
         help="Target Python version for the test (defaults to oldest supported Python version).",

tests/typecheck_typeshed.py

@@ -14,7 +14,7 @@
 ReturnCode: TypeAlias = int
 
 SUPPORTED_PLATFORMS = ("linux", "darwin", "win32")
-SUPPORTED_VERSIONS = ("3.14", "3.13", "3.12", "3.11", "3.10", "3.9")
+SUPPORTED_VERSIONS = ("3.14", "3.13", "3.12", "3.11", "3.10")
 LOWEST_SUPPORTED_VERSION = min(SUPPORTED_VERSIONS, key=lambda x: int(x.split(".")[1]))
 DIRECTORIES_TO_TEST = ("scripts", "tests")
 EMPTY: list[str] = []