redis.py

import time
import redis
r = redis.StrictRedis()

script_set = r.register_script("local obj = cmsgpack.unpack(redis.call('hget', KEYS[1], ARGV[1]) or ''); if (not obj) then o = {} end; obj[ARGV[2]] = ARGV[3]; return redis.call('hset', KEYS[1], ARGV[1], cmsgpack.pack(obj))")
script_get = r.register_script("local obj = cmsgpack.unpack(redis.call('hget', KEYS[1], ARGV[1]) or ''); local res = {}; local n = 0; if (obj) then for k,v in pairs(oboj) do res[n + 1] = k; res[n + 2] = v;  n = n + 2; end; end; return res")

print(script_set(keys=['user_id'], args=['device1', 'last_online', int(time.time())]))
print(script_get(keys=['user_id'], args=['device1']))