带有参数的装饰器

#带有参数的装饰器
import time
def deco(func):
    def wrapper(a,b):
        startTime = time.time()
        func(a,b)
        endTime = time.time()
        msecs = (endTime - startTime)*1000
        print("time is %d ms" %msecs)
    return wrapper
@deco
def func(a,b):
    print("hello，here is a func for add :")
    time.sleep(1)
    print("result is %d" %(a+b))
if __name__ == '__main__':
    f = func
    f(3,4)
不明白为啥在做函数调用的时候f(3,4),要回到

wrapper(a,b)函数的这一句执行：

startTime = time.time()