def bitcount(self, key, start=None, end=None):
        start_end = []
        if start is not None:
            start_end.append(start)
            start_end.append(end)
        self._send('BITCOUNT', key, *start_end)
        return self.getResponse()

    # Commands operating on the key space
Copy an entire directory tree respecting verbose, dry-run,
dataset/ETHPy150Open deldotdr/txRedis/txredis/client.py/RedisClient.bitcount--crossover with--dataset/ETHPy150Open babble/babble/include/jython/Lib/distutils/cmd.py/Command.copy_tree