20180209 装饰器

  1

def outer(func):
    def inner():
        print('456')
        ret = func()
        print('789')
        return ret

    return inner


@outer
def inder():
    print('123')


inder()

#装饰器带参数
def outer(func):
    def inner(a1,a2):
        print('456')
        ret = func(a1,a2)
        print('789')
        print(ret)
        return ret
    return inner
@outer
def inder(a1,a2):
    print('123')
    return a1+a2
inder(4,4)

 

带N个参数的装饰器
def outer(func):
    def inner(*arg,**kwargs):
        print('456')
        ret = func(*arg,**kwargs)
        print('789')
        print(ret)
        return ret
    return inner
@outer
def inder(a1,a2,a3):
    print('123')
    return a1+a2+a3
inder(4,4,6)

 

#多个装饰器装饰同一个函数
def oueter2(func):
    def innet(*arg,**kwargs):
        print('3.5')
        ret=func(*arg,**kwargs)
        return ret
    return innet

def outer(func):
    def inner(*arg,**kwargs):
        print('456')
        ret = func(*arg,**kwargs)
        print('789')
        print(ret)
        return ret
    return inner
@oueter2
@outer
def inder(a1,a2,a3):
    print('123')
    return a1+a2+a3
inder(4,4,6)