参考如下博客。

https://www.cnblogs.com/DswCnblog/p/6126588.html

 

#!/usr/bin/env python# with_example02.py class Sample:    def __enter__(self):        print "go to enter():"        return self     def __exit__(self, type, value, trace):        print "go to exit():"        print "type:", type        print "value:", value        print "trace:", trace     def do_something(self):        print "go to do_something():"        bar = 1/0        return bar + 10 with Sample() as sample:    sample.do_something()

 

 

运行结果：