def wrap_in_tag_b(fn): # wrap_in_tag_b 是真正的装饰器def wrapped():return "<b>" + fn() + "</b>"return wrappeddef wrap_in_tag_i(fn):def wrapped():return "<i>" + fn() + "</i>"return wrapped@wrap_in_tag_b
@wrap_in_tag_i
def hello():return "hello"print(hello()) # returns "<b><i>hello world</i></b>"

def wrap_in_tag_b(fn):def wrapped(arg): # arg 是原函数参数return "<b>" + fn(arg) + "</b>"return wrappeddef wrap_in_tag_i(fn):def wrapped(arg): # arg 是原函数参数return "<i>" + fn(arg) + "</i>"return wrapped@wrap_in_tag_b
@wrap_in_tag_i
def hello(name):return "hello {}".formar(name)print(hello('Jack')) 

def wrap_in_tag(deco_arg):# 装饰器参数：deco_arg# 可以在任意位置使用def real_decorator(func):  # real_decorator才是即将返回的真正的装饰器# 原函数参数：func_arg # 只可以在此位置使用　　　　def wrapped() :return "<{0}>{1}</{0}>".format(deco_arg, func())return wrappedreturn real_decorator@wrap_in_tag('b')
@wrap_in_tag('i')
def hello():return "hello"print(hello())

def wrap_in_tag(deco_arg):# 装饰器参数：deco_arg# 可以在任意位置使用def real_decorator(func):  # real_decorator才是即将返回的真正的装饰器def wrapped(func_arg):# 原函数参数：func_arg# 只可以在此位置使用return "<{0}>{1}</{0}>".format(deco_arg, func(func_arg))return wrappedreturn real_decorator@wrap_in_tag('b')
@wrap_in_tag('i')
def hello(name):return "hello {}".format(name)print(hello('Jack'))

class wrap_in_tag(object):def __init__(self, deco_arg):self.tag = deco_arg  # 装饰器参数：deco_argdef __call__(self, func):def newf(): # 原函数无参数return "<{0}>{1}</{0}>".format(self.tag, func())return newf@wrap_in_tag('b')
@wrap_in_tag('i')
def hello():return 'hello'print(hello())

class wrap_in_tag(object):def __init__(self, deco_arg):self.tag = deco_arg # 装饰器参数：deco_argdef __call__(self, func):def newf(func_arg): # 原函数参数: func_argreturn "<{0}>{1}</{0}>".format(self.tag, func(func_arg))return newf@wrap_in_tag('b')
@wrap_in_tag('i')
def hello(name):return "hello {}".format(name)print(hello('Jack'))

def wrap_in_tag(deco_arg):def real_decorator(func):def wrapped(self, func_arg): # 类方法接收第一个参数都是self，这个必须有，而无论func_arg是否有!!!return "<{0}>{1}</{0}>".format(deco_arg, func(func_arg))return wrappedreturn real_decoratorclass foo(object):@wrap_in_tag('b')@wrap_in_tag('i')def hello(self, name):return 'hello {}".format(name)
    @wrap_in_tag('b')@wrap_in_tag('i')def byebye(self, name):return 'byebye {}".format(name)

f = foo()
print(f.hello('Jack')

class wrap_in_tag(object):def __init__(self, deco_arg):self.tag = deco_argdef __call__(self, func):def newf(slf, func_arg): # slf必须！self被占用了，那就给第一个参数另一个名字slf（随便）return "<{0}>{1}</{0}>".format(self.tag, func(func_arg))return newfclass foo(object):@wrap_in_tag('b')@wrap_in_tag('i')def hello(self, name):return 'hello {}".format(name)
    @wrap_in_tag('b')@wrap_in_tag('i')def byebye(self, name):return 'byebye {}".format(name)

f = foo()
print(f.hello('Jack'))