Unexpected UNWATCH after pipeline EXEC

[nickgaya]

Version:
Redis-py 3.4.1
Redis 5.0.7

Platform:
Python 3.8.2
Mac OS 10.13.6

Description:
When executing a transaction with watched keys, Pipeline.execute() does not clear the watching state of the pipeline object, so a subsequent call to Pipeline.reset() will send an extra UNWATCH command to the server.

Example:

from redis import Redis
redis = Redis(...)

with redis.pipeline() as pipe:
    pipe.watch("key")
    pipe.get("key")
    pipe.multi()
    pipe.set("key", "value")
    pipe.execute()

Redis monitor output:

1583397021.463844 [0 172.17.0.1:50360] "WATCH" "key"
1583397021.465269 [0 172.17.0.1:50360] "GET" "key"
1583397021.466502 [0 172.17.0.1:50360] "MULTI"
1583397021.466524 [0 172.17.0.1:50360] "SET" "key" "value"
1583397021.466531 [0 172.17.0.1:50360] "EXEC"
1583397021.467971 [0 172.17.0.1:50360] "UNWATCH"

[andymccurdy]

Thanks, merged in 9c8be70