Fix formatting

Author: kinow

pandas/tests/io/formats/test_to_csv.py

@@ -559,14 +559,11 @@ def test_to_csv_zip_arguments(self, compression, archive_name):
     @pytest.mark.parametrize("df_new_type", ["Int64"])
     def test_to_csv_na_rep_long_string(self, df_new_type):
         # see gh-25099
-        df = pd.DataFrame({"c": [float('nan')]*3})
+        df = pd.DataFrame({"c": [float("nan")] * 3})
         df = df.astype(df_new_type)
-        expected_rows = ['c',
-                         'mynull',
-                         'mynull',
-                         'mynull']
+        expected_rows = ["c", "mynull", "mynull", "mynull"]
         expected = tm.convert_rows_list_to_csv_str(expected_rows)
 
-        result = df.to_csv(index=False, na_rep='mynull', encoding='ascii')
+        result = df.to_csv(index=False, na_rep="mynull", encoding="ascii")
 
         assert expected == result