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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 run(self):
 """Call the task's func. The task's func will be called with the bundling requests func """

        if not self._in_deque:
            return
        req = self._bundling_request
        del getattr(req, self.bundled_field)[:]
        getattr(req, self.bundled_field).extend(
            [e for elts in self._in_deque for e in elts])

        subresponse_field = self.subresponse_field
        if subresponse_field:
            self._run_with_subresponses(req, subresponse_field, self._kwargs)
        else:
            self._run_with_no_subresponse(req, self._kwargs)