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属性在本质上来讲是一组方法，但是调用的时候却如同字段，换句话说，其实就是对字段的一种封装，在设定和读取的时候，可以很轻易的添加逻辑，而其调用方式其不会改变
在Pyhon中可以用@property来定义：
class Book(object): def __init__(self, title, price): self._title = title self._price = price @property def price(self): return "${}".format(self._price) @price.setter def price(self, value): self._price = value @price.deleter def price(self): del self._price book = Book("Python Basic", 100) print(book.price) book.price = 200 print(book.price) del book.price print(book.price)
运行结果：
$100 $200 Traceback (most recent call last): File "C:\Users\Miles\python\class_object\20160125_1.py", line 26, in <module> print(book.price) File "C:\Users\Miles\python\class_object\20160125_1.py", line 8, in price return "${}".format(self._price) AttributeError: ‘Book‘ object has no attribute ‘_price‘
019: class, objects and instance: property
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原文地址：http://www.cnblogs.com/jcsz/p/5158790.html
