python基礎-裝飾器（二）加上返回值

import time


def timer(func):
    def wrapper():
        start_time = time.time()
        res=func() #foo函數返回值接收
        end_time = time.time()
        print('函數的運行時間是%s' % (end_time - start_time))
        return res #wrapper函數返回值

    return wrapper  # 返回函數wrapper


@timer
def foo():
    print('from foo')
    time.sleep(1)
    return 'foo函數返回值'


res=foo()  # 形式上是運行foo函數，實際上是運行wrapper函數
print(res)