装饰器

Posted 2020-07-29 张瑞东

def outer(func):
    def inter():
        print(\'befor\')
        func()
        print(\'after\')
    return inter

@outer
def f1():
    print(\'F1\')

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结构：@+函数名

功能：

    1.遇到@时自动执行outer函数，并将其下面的函数f1()当做参数传递到装饰器

    2.将outer的返回值，重新赋给f1()

 

有返回值的装饰器

#有返回值的装饰器
def outer(func):
    def inner():
        print(\'befor\')
        r = func()
        print(\'after\')
        return r
    return inner


@outer
def f1():
    print(\'F1\')
    return "ff"

r = f1()
print(r)

有返回值的装饰器

带参数的装饰器

def outer(func):
    def inner(a):
        print(\'befor\')
        r = func(a)
        print(\'after\')
        return r
    return inner


@outer
def f1(args):
    print(args)
    return "ff"

r = f1(\'zhang\')
print(r)

带参数的装饰器

万能参数

def outer(func):
    def inner(*args, **kwargs):
        print(\'befor\')
        r = func(*args, **kwargs)
        print(\'after\')
        return r
    return inner

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