python装饰器 运行时间

#/usr/bin/env python3

import time
def outer(key):
    def timer(func):
        def wrapper(*args,**kwargs):
            print(key)
            s=time.time()
            res=func(*args,**kwargs)
            e=time.time()
            print(e-s)
            return res
        return wrapper
    return timer

@outer('dec info')
def do(a):
    time.sleep(1)
    print(a)
    return a+1