【3.11】Python中的with语句

 1 #!/user/bin/env python
 2 # -*- coding:utf-8 -*-
 3 
 4 # 上下文管理器协议
 5 
 6 
 7 class Sample:
 8     def __enter__(self):
 9         print('enter')
10         return self
11 
12     def __exit__(self, exc_type, exc_val, exc_tb):
13         print('exit')
14 
15     @staticmethod
16     def do_something():
17         print('do_something')
18 
19 
20 with Sample() as sample:
21     sample.do_something()

enter
do_something
exit