Is it possible to WATCH multiple Redis KEYs in python?

Question

I've been playing with Redis lately, wondering how to accomplish watching multiple keys at once. Would something like below be atomic?

Following code uses redis-py;

 while True:            
        try:
            pipe.watch(key)
            pipe.watch(another_key)
            pipe.multi()
            pipe.set(key, value)
            pipe.set(another_key, another_value)
            pipe.execute()

            break
        except redis.WatchError:
            continue

        finally:
            pipe.reset()

Answer 1

redis has support for multiple keys, yes: http://redis.io/commands/watch

although the docs for the python client say that pipelined commands are executed atomically, I would still use a single WATCH call with multiple arguments:

pipe.watch(key, another_key)