Python的高级特性10:无聊的@property
@property装饰器其实有点无聊,单独拿出来作为一个知识点其实没必要,尽管它可以将方法变成属性,让get和set方法更好用,但是，它破坏了python的简洁(不是代码的简洁而是指语法上)。下面来说明为什么我会这么说。
首先，看一个使用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)
结果是：
/System/Library/Frameworks/Python.framework/Versions/3.4/bin/python3 /Users/lsf/PycharmProjects/py3Project/test3.py
alex
Process finished with exit code 0
看上去的确好用,但其实python内置的__getattr__和__setattr__就是将方法变为属性功能的。
class Stu(object):
def __init__(self):
pass
def __setattr__(self,name,value):
self.__dict__ = value
def __getattr__(self):
return self.name
s = Stu()
s.name = 'alex'
print(s.name)
结果当然是：
/System/Library/Frameworks/Python.framework/Versions/3.4/bin/python3 /Users/lsf/PycharmProjects/py3Project/test3.py
alex
Process finished with exit code 0
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