def get_contents_to_file(self, fp, headers=None,
                             cb=None, num_cb=10,
                             torrent=False,
                             version_id=None,
                             res_download_handler=None,
                             response_headers=None, callback=None):
        if self.bucket != None:
            if res_download_handler:
                res_download_handler.get_file(self, fp, headers, cb, num_cb,
                                              torrent=torrent,
                                              version_id=version_id, callback=callback)
            else:
                self.get_file(fp, headers, cb, num_cb, torrent=torrent,
                              version_id=version_id,
                              response_headers=response_headers, callback=callback)
Retrieve an object from S3 using the name of the Key object as the
dataset/ETHPy150Open yyuu/botornado/botornado/s3/key.py/AsyncKey.get_contents_to_file