def _get_channel(self, channel_number):
        """Returns slice into internal memmap for requested channel"""
        try:
            mm_index = self.header.Channel_ID.index(channel_number)
        except __HOLE__:
            logging.info( "Channel number %d does not exist" % channel_number)
            return np.array([])

        self.regenerate_memmap()
        return self._mm[:, mm_index]
dataset/ETHPy150Open NeuralEnsemble/python-neo/neo/io/blackrockio_deprecated.py/Loader._get_channel