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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 perform(self):
 """ Performs bulk operation """

        for request in self._cfg[Integrator._CFG_KEY_REQUESTS]:
            request_type = self._cfg[Integrator._CFG_KEY_REQUESTS][request][Integrator._CFG_KEY_REQUEST_TYPE]
            request_cfg_file = self._cfg[Integrator._CFG_KEY_REQUESTS][request][Integrator._CFG_KEY_REQUEST_CFG_FILE]
            self._logger.debug('{}'.format(request_cfg_file))
            self._process_request(request, request_type, request_cfg_file)