In a publish/subscribe (pub/sub) model in Redis, you may want to know the number of subscribers to a particular channel. This is useful for load balancing and traffic management.
To get the number of subscribers in Redis using Python, you can use the
pubsub_numsub method from the redis-py client library. Here's an example:
This script will connect to the Redis server, then get the number of subscribers to the 'channel'. The
pubsub_numsub method returns a list where each element is a 2-element tuple; the first element is the channel name and the second is the count of subscribers. In this case, since we are interested in only one channel, we take the first element
 and the second element of the tuple
pubsub_numsub. It doesn't return just a number but a list of tuples.
pubsub_numsub work for pattern-based subscriptions as well?
pubsub_numsub only works with channel-based subscriptions. Pattern-based subscription counts are not maintained by Redis.