STYLE: Format code with ruff

Author: cloudboat

pandas/core/indexes/multi.py

@@ -2731,11 +2731,11 @@ def insert_level(self, position: int, value, name=None) -> MultiIndex:
 
         Examples
         --------
-        >>> idx = pd.MultiIndex.from_tuples([('A', 1), ('B', 2)], names=['x', 'y'])
-        >>> idx.insert_level(0, 'grp')
+        >>> idx = pd.MultiIndex.from_tuples([("A", 1), ("B", 2)], names=["x", "y"])
+        >>> idx.insert_level(0, "grp")
         MultiIndex([('grp', 'A', 1), ('grp', 'B', 2)],
                    names=[None, 'x', 'y'])
-        >>> idx.insert_level(1, ['L1', 'L2'], name='z')
+        >>> idx.insert_level(1, ["L1", "L2"], name="z")
         MultiIndex([('A', 'L1', 1), ('B', 'L2', 2)],
                    names=['x', 'z', 'y'])
         """
@@ -2773,6 +2773,7 @@ def insert_level(self, position: int, value, name=None) -> MultiIndex:
         new_names.insert(position, name)
 
         from pandas import MultiIndex
+
         return MultiIndex.from_tuples(new_tuples, names=new_names)
 
     def _reorder_ilevels(self, order) -> MultiIndex:
@@ -4451,5 +4452,3 @@ def cartesian_product(X: list[np.ndarray]) -> list[np.ndarray]:
         )
         for i, x in enumerate(X)
     ]
-
-

pandas/tests/indexes/multi/test_insert_level.py

@@ -5,7 +5,6 @@
 
 
 class TestMultiIndexInsertLevel:
-
     def setup_method(self):
         self.simple_idx = pd.MultiIndex.from_tuples(
             [("A", 1), ("B", 2), ("C", 3)], names=["level1", "level2"]
@@ -16,14 +15,14 @@ def test_insert_level_basic(self):
         result = self.simple_idx.insert_level(0, "new_value")
         expected = pd.MultiIndex.from_tuples(
             [("new_value", "A", 1), ("new_value", "B", 2), ("new_value", "C", 3)],
-            names=[None, "level1", "level2"]
+            names=[None, "level1", "level2"],
         )
         tm.assert_index_equal(result, expected)
 
         result = self.simple_idx.insert_level(1, "middle")
         expected = pd.MultiIndex.from_tuples(
             [("A", "middle", 1), ("B", "middle", 2), ("C", "middle", 3)],
-            names=["level1", None, "level2"]
+            names=["level1", None, "level2"],
         )
         tm.assert_index_equal(result, expected)
 
@@ -32,7 +31,7 @@ def test_insert_level_with_different_values(self):
         result = self.simple_idx.insert_level(1, new_values)
         expected = pd.MultiIndex.from_tuples(
             [("A", "X", 1), ("B", "Y", 2), ("C", "Z", 3)],
-            names=["level1", None, "level2"]
+            names=["level1", None, "level2"],
         )
         tm.assert_index_equal(result, expected)
 
@@ -78,8 +77,7 @@ def test_insert_level_preserves_original(self):
 
         def test_debug_names():
             idx = pd.MultiIndex.from_tuples(
-                [("A", 1), ("B", 2), ("C", 3)],
-                names=["level1", "level2"]
+                [("A", 1), ("B", 2), ("C", 3)], names=["level1", "level2"]
             )
             print("Original names:", idx.names)
 
@@ -88,6 +86,6 @@ def test_debug_names():
 
             expected = pd.MultiIndex.from_tuples(
                 [("new_value", "A", 1), ("new_value", "B", 2), ("new_value", "C", 3)],
-                names=[None, "level1", "level2"]
+                names=[None, "level1", "level2"],
             )
             print("Expected names:", expected.names)