Fix formatting

Author: kinow

pandas/tests/io/formats/test_to_csv.py

@@ -559,7 +559,7 @@ 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',