python 用abc模块构建抽象基类Abstract Base Classes

Posted 2020-12-27 tlz888

　　见代码：

 1 #!/usr/bin/env python
 2 # -*- coding: utf-8 -*-
 3 # @Time    : 2018/08/01 16:58
 4 from abc import ABCMeta, abstractmethod
 5 
 6 
 7 class SClass(object):
 8     __metaclass__ = ABCMeta
 9 
10     @abstractmethod
11     def my_print(self):
12         pass
13 
14 
15 class C0Class(SClass):
16     pass
17 
18 
19 class C1Class(SClass):
20 
21     def my_print(self):
22         print ‘call my_print in child instance.‘
23 
24 
25 if __name__ == ‘__main__‘:
26     try:
27         c0 = C0Class()
28         c0.my_print()
29     except Exception, e:
30         print e.message
31 
32     c1 = C1Class()
33     c1.my_print()

输出：

1 Can‘t instantiate abstract class C0Class with abstract methods my_print
2 call my_print in child instance.