replaced single-quote with double

Author: Mariihmp

tests/test_frame.py

@@ -1088,14 +1088,16 @@ def test_types_pivot_table() -> None:
     )
 
     def test_pivot_table_sort():
-        df = DataFrame(
-            {'a': [1, 2],
-             'b': [3, 4],
-             'c': [5, 6],
-             'd': [7, 8]}
+        df = pd.DataFrame(
+            {"a": [1, 2],
+             "b": [3, 4],
+             "c": [5, 6],
+             "d": [7, 8]}
         )
-        check(assert_type(df.pivot_table(values='a', index='b', columns='c', sort=True),
-                          pd.DataFrame), pd.DataFrame)
+
+
+        check(assert_type(df.pivot_table(values="a", index="b", columns="c"
+                                         , sort=True), pd.DataFrame), pd.DataFrame)
 
 
 def test_types_groupby_as_index() -> None: