u"""
        Iterate other tokens to find strings and ensure that they are prefixed.
        :param tokens:
        :return:

def process_tokens(self, tokens):
        u"""
        Iterate other tokens to find strings and ensure that they are prefixed.
        :param tokens:
        :return:
        """
        for (tok_type, token, (start_row, _), _, _) in tokens:
            if tok_type == tokenize.STRING:
                self._check_string(token, start_row)