'Determine if ancestor_readme_files is equal to or a subset of current_readme_files.'

def compare_readme_files(self, ancestor_readme_files, current_readme_files):

    if (len(ancestor_readme_files) <= len(current_readme_files)):
        for ancestor_readme_file in ancestor_readme_files:
            if (ancestor_readme_file not in current_readme_files):
                return self.NOT_EQUAL_AND_NOT_SUBSET
        if (len(ancestor_readme_files) == len(current_readme_files)):
            return self.EQUAL
        else:
            return self.SUBSET
    return self.NOT_EQUAL_AND_NOT_SUBSET
