装饰器

闭包

def fun():
    a = 1

    def func():
        print(a)

    return func


if __name__ == '__main__':
    b = fun()
    b()

闭包就是在函数中定义新的函数 运行顺序为赋值，然后运行到return函数 在执行func函数

简单装饰器

def funcTime(func):
    print("func")

    def itor():
        startTime = time.perf_counter()
        print("开始前")
        func()
        print("开始后")
        endTime = time.perf_counter()
        print("程序{}运行{}".format(func.__name__, (endTime - startTime) * 1000))

    return itor


@funcTime
def fun():
    print("hello")


if __name__ == '__main__':
    fun()

运行顺序
@funcTime=>funcTime函数=>print('func')=>main函数执行=>itor()=>开始前=>fun()函数=>开始后=>结束

装饰器简单传参

def funPrin(*args, **kwargs):
    for i in args:
        print(i, end='')
    print()

    # print("{}".format(i for i in (1, 2)))

    def funcTime(func):
        def itor():
            startTime = time.perf_counter()
            func()
            endTime = time.perf_counter()
            print("程序{}运行{}".format(func.__name__, (endTime - startTime) * 1000))

        return itor

    return funcTime


@funPrin(1, 2)
def fun1():
    list1 = [i for i in range(9999999)]