CamelCase -> camel_case

def snake_case_backend_name(self):
        """ CamelCase -> camel_case
        """
        s1 = re.sub('(.)([A-Z][a-z]+)', r'\1_\2', type(self).__name__)
        return re.sub('([a-z0-9])([A-Z])', r'\1_\2', s1).lower()