def check_request_token(self, request_token):
        """Checks that the request token contains only safe characters
        and is no shorter than lower and no longer than upper.
        """
        lower, upper = self.request_token_length
        return (set(request_token) <= self.safe_characters and
                lower <= len(request_token) <= upper)
dataset/ETHPy150Open hzlf/openbroadcast/services/bcmon/requests/packages/oauthlib/oauth1/rfc5849/__init__.py/Server.check_request_token/original