In applications where Redis is used as a database, cache, or message broker, we may find ourselves needing to find the length of a list stored at a particular key. Some examples include:
Example 1: Using llen
to get the length of a redis list
import redis r = redis.Redis() len = r.llen('mylist') print(len)
In the example above, llen
command is used to get the length of the list stored at the key 'mylist'.
Q: Can I use llen to get the length of sets, hashes, strings etc?
A: No. The llen
command only works on Redis lists, not other data types.
Q: What happens if the key does not exist?
A: Redis llen
returns 0 if the key doesn't exist.
Dragonfly is fully compatible with the Redis ecosystem and requires no code changes to implement.