Comparing values between two different dataframe

compare_dataframes.py

def equal_dataframes(self, a_df, b_df, columns):
    """Equality check between dataframe values, first selects relevant columns, then sorts, then compares values."""
    # NOTE fillna is used to eliminate NaNs as NaN != NaN
    # https://stackoverflow.com/a/23666623/2126910
    return (a_df[columns].sort_values(list(columns)).fillna(0).values ==
            b_df[columns].sort_values(list(columns)).fillna(0).values).all()