python设置redis中某一key的过期时间为-1时，为什么这个键直接被销毁了？

Question

key_name = 'test_h'
redis.expire(key_name, -1)
redis.execute()

redis中这个键直接被销毁了，为什么？？

Answer 1

python函数是对命令的包装，直接看文档示例

redis> SET mykey "Hello"
OK
redis> EXPIRE mykey 10
(integer) 1
redis> TTL mykey
(integer) 10
redis> SET mykey "Hello World"
OK
redis> TTL mykey
(integer) -1
redis> 

可以看到删除key时的过期时间就是-1

再看Normally Redis keys are created without an associated time to live. The key will simply live forever, unless it is removed by the user in an explicit way
意思就是不设置过期时间则永不过期

Answer 2

已经过期了呀，过期了就会被销毁

Answer 3

想让它永不过期，用redis.persist(key)