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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _execute(self, request):
 """Run execute with retries and rate limiting. Args: request (object):
 The HttpRequest object to execute. Returns: dict: The response from the API. """

        if self._rate_limiter:
            # Since the ratelimiter library only exposes a context manager
            # interface the code has to be duplicated to handle the case where
            # no rate limiter is defined.
            with self._rate_limiter:
                return request.execute(http=self.http,
                                       num_retries=self._num_retries)
        return request.execute(http=self.http,
                               num_retries=self._num_retries)