Return the expiration in milliseconds of a key.
redis.set("key1", "Hello") assert redis.pttl("key1") == -1 redis.expire("key1", 1000) assert redis.pttl("key1") > 0 redis.persist("key1") assert redis.pttl("key1") == -1
The key
The number of milliseconds until this expires, negative if the key does not exist or does not have an expiration set.
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