python closure and function decorators 2

好吧，基础打好，聊聊decorator，先看这段代码：

def SayHi(name):
    return "How are you {0}, good morning".format(name)

def decoator(func):
    def func_wrapper(name):
        return "<p>{0}</p>".format(func(name))
    return func_wrapper

hi = decoator(SayHi)
print hi("Allen")

当我们每次调用hi()方法的时候，你不觉得特别方便么？

很多人会问，为啥要用decoator？请想想，再增加一个返回<div></div>的函数是不是更方便

 

好了，下面说点语法糖，用到@函数修饰

def decoator(func):
    def func_wrapper(name):
        return "<p>{0}</p>".format(func(name))
    return func_wrapper

@decoator
def SayHi(name):
    return "How are you {0}, good morning".format(name)

print SayHi("Allen")

代码几乎没变，却更干净，整洁，优雅了

 

更多的时候，很多人这么使用decorator，是不是很舒服？ 

class Decorate:
    def decorate(self,func):
        def func_wrapper(self):
            return "<p>{0}</p>".format(func(self))
        return func_wrapper

class Person(object):
    d = Decorate()
    def __init__(self):
        self.name = "Allen"
        self.family = "Liu"

    @d.decorate
    def get_fullname(self):
        return self.name+" "+self.family

my_person = Person()
print my_person.get_fullname()

<p>Allen Liu</p>