Python中property描述器的使用

property描述器可以让访问方法时使用属性访问的语法：

>>> class Person:
...     def __init__(self, name):
...         self.__name = name
...     def get_name(self):
...         return '姓名：' + self.__name
...     def set_name(self, name):
...         if not isinstance(name, str):
...             raise TypeError('名字必须是字符串！')
...         self.__name = name
...     name = property(get_name, set_name)
...
>>>
>>> p = Person('韩晓萌')
>>> p.name
'姓名：韩晓萌'
>>> p.name = 1
Traceback (most recent call last):
  File "<pyshell#13>", line 1, in <module>
    p.name = 1
  File "<pyshell#10>", line 8, in set_name
    raise TypeError('名字必须是字符串！')
TypeError: 名字必须是字符串！
>>> p.name = '杨超越'
>>> p.name
'姓名：杨超越'

采用装饰器语法：

>>> class Person:
...     def __init__(self, name):
...         self.__name = name
...        @property
...     def name(self):
...         return '姓名：' + self.name
...        @name.setter
...     def set_name(self, name):
...         if not isinstance(name, str):
...             raise TypeError('名字必须是字符串！')
...         self.name = name
...
>>>
>>> p = Person('韩晓萌')
>>> p.name
'姓名：韩晓萌'
>>> p.name = 1
Traceback (most recent call last):
  File "<pyshell#31>", line 1, in <module>
    p.name = 1
  File "<pyshell#28>", line 12, in name
    raise TypeError('名字必须是字符串！')
TypeError: 名字必须是字符串！
>>> p.name = '杨超越'
>>> p.name
'姓名：杨超越'