装饰器

#__author__:Administrator}
#data: 2017/11/23
import time

def showtime(f):
    def inner():
        start = time.time()
        f()
        end = time.time()
        print(end - start)

    return inner

@showtime  #等价于foo = showtime(foo)
def foo():
    print('foo.........')
    time.sleep(2)

foo()

#foo()
#foo = showtime(foo)#把inner放入内存，然后再复制给foo
# @showtime
# def bar():
#     print('bar...........')
#     time.sleep(2)

#bar = showtime(bar)#把inner放入内存，然后再复制给foo

# bar()#执行inner函数