fix index issue in Python 3.8

tests/test_process_functions.py

@@ -5,8 +5,12 @@
 import pytest
 import synapseclient
 from genie import process_functions
-from pandas.api.types import (is_bool_dtype, is_float_dtype, is_integer_dtype,
-                              is_string_dtype)
+from pandas.api.types import (
+    is_bool_dtype,
+    is_float_dtype,
+    is_integer_dtype,
+    is_string_dtype,
+)
 from pandas.testing import assert_frame_equal
 
 DATABASE_DF = pd.DataFrame(
@@ -655,6 +659,7 @@ def test_that_create_missing_columns_gets_expected_output_with_single_col_df(
     result = process_functions.create_missing_columns(
         dataset=test_cases["test_input"], schema=test_cases["test_schema"]
     )
+    result.reset_index(drop=True, inplace=True)
     assert_frame_equal(result, test_cases["expected_output"], check_dtype=False)
     assert test_cases["expected_dtype"](result.iloc[:, 0])
     assert result.isna().sum().sum() == test_cases["expected_na_count"]