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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 download(self, bucket, key, fileobj, transfer_config=None, subscribers=None):
        ''' download a file using Aspera '''
        check_io_access(os.path.dirname(fileobj), os.W_OK)
        return self._queue_task(bucket, [FilePair(key, fileobj)], transfer_config,
                                subscribers, enumAsperaDirection.RECEIVE)