- 问题背景: 源于公司的原来的代码是python2开发的，后来改为python3开发，设计到的property的用法有点不一样
- 直接上代码
公司原来的python2的代码
class LineItem:
def __init__(self, description, weight, price):
self.description = description
self.__weight = weight
self.price = price
@property
def weight(self):
return self.__weight
@weight.setter
def set_weight(self, value):
if value > 0:
self.__weight = value
else:
raise ValueError('weight must be > 0')运行代码
In [2]: l = LineItem('a', 3, 6)
In [3]: l.weight
Out[3]: 3
In [4]: l.weight = 5
In [5]: l.weight
Out[5]: 5这个代码在python2下面执行没有问题，但是在python3下面执行，会报错，在执行In [4]: l.weight = 5的时候报错
In [4]: l.weight = 5
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
<ipython-input-4-3c1df6104a5e> in <module>
----> 1 l.weight = 5
AttributeError: can't set attribute- 解决方法
按理说，上面的那种写法不是很规范，无论是在python2还是python3的文档实例里面都不是这么写的，所以为了简便和不出错，我们统一使用下面的这种写法
class LineItem:
def __init__(self, description, weight, price):
self.description = description
self.__weight = weight
self.price = price
@property
def weight(self):
return self.__weight
@weight.setter
def weight(self, value):
if value > 0:
self.__weight = value
else:
raise ValueError('weight must be > 0')主要区别在于这一行def weight(self, value):
