python习题：操作redis数据库

def op_redis(k,v=None,expired = 0,db = 0,# expired 是失效时间
                host='211.149.218.16',
                password='123456',
                port=6379,
                ):
    r = redis.Redis(host=host,
                password=password,
                port=port,
                db=db)
    if expired >0 : 
        r.setex(k,v,expired)
        res = 'ok'
    elif v :
        r.set(k,v)
        res = 'ok'
    else:
        res = r.get(k)
        if res:# 判断有没有get到数据
            res = res.decode()
        else:
            res = None
    return res

print(op_redis('angry','stom your feet'))
print(op_redis('peking:shop:ipd pro','6899'))