函数装饰器、类装饰器

一:函数装饰函数
def wrapFun(func):
    def inner(a, b):
        print('function name:', func.__name__)
        r = func(a, b)
        return r
    return inner

@wrapFun
def myadd(a, b):
    return a + b

print(myadd(2, 3))

二:函数装饰类
def wrapClass(cls):
    def inner(a):
        print('class name:', cls.__name__)
        return cls(a)
    return inner

@wrapClass
class Foo():
    def __init__(self, a):
        self.a = a

    def fun(self):
        print('self.a =', self.a)


m = Foo('xiemanR')
m.fun()

三:类装饰函数
class ShowFunName():
    def __init__(self, func):
        self._func = func

    def __call__(self, a):
        print('function name:', self._func.__name__)
        return self._func(a)


@ShowFunName
def Bar(a):
    return a

print(Bar('xiemanR'))

四:类装饰类
class ShowClassName(object):
    def __init__(self, cls):
        self._cls = cls

    def __call__(self, a):
        print('class name:', self._cls.__name__)
        return self._cls(a)


@ShowClassName
class Foobar(object):
    def __init__(self, a):
        self.value = a

    def fun(self):
        print(self.value)

a = Foobar('xiemanR')
a.fun()

五:函数装饰类中的方法
def wrapFun(func):
    def inner(*args, **kwargs):
        r = func(*args, **kwargs)
        return r
    return inner
class Foobar(object):
    def __init__(self, a):
        self.value = a
  

  @wrapFun   def fun(self): print(self.value) a = Foobar('xiemanR') a.fun()
 
六:类装饰器装饰类中的方法:  会报错,原因是fun被装饰后变成了类的一个属性,而不是方法。
 

 

posted @ 2019-02-19 20:41  Cool·  阅读(354)  评论(0编辑  收藏  举报