def _get_argument(self, name, default, source, strip=True):
        args = self._get_arguments(name, source, strip=strip)
        if not args:
            if default is self._ARG_DEFAULT:
                raise MissingArgumentError(name)
            return default
        return args[-1]
dataset/ETHPy150Open RobotWebTools/rosbridge_suite/rosbridge_server/src/tornado/web.py/RequestHandler._get_argument/original