Python的高級特性10:無聊的@property

@property裝飾器其實有點無聊,單獨拿出來做爲一個知識點其實不必,儘管它能夠將方法變成屬性,讓get和set方法更好用,可是，它破壞了python的簡潔(不是代碼的簡潔而是指語法上)。

下面來講明爲何我會這麼說。

首先，看一個使用property。

class Student(object):

    @property
    def testname(self):
        return self.name

    @testname.setter
    def testname(self,name):
        self.name = name

s = Student()

s.testname = "alex"
print(s.testname)

結果是：

/System/Library/Frameworks/Python.framework/Versions/3.4/bin/python3 /Users/lsf/PycharmProjects/py3Project/test3.py
alex

Process finished with exit code 0

看上去的確好用,但其實python內置的__getattr__和__setattr__就是將方法變爲屬性功能的。

class Stu(object):
    def __init__(self):
        pass

    def __setattr__(self,name,value):
        self.__dict__[name] = value

    def __getattr__(self):
        return self.name



s = Stu()
s.name = 'alex'
print(s.name)

結果固然是：

/System/Library/Frameworks/Python.framework/Versions/3.4/bin/python3 /Users/lsf/PycharmProjects/py3Project/test3.py
alex

Process finished with exit code 0