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#!/usr/bin/env python
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#coding=utf8
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import sys
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'''
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must implement method '__enter__' and '__exit__'. same as
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try:
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__enter__
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block
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finally:
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__exit__
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'''
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class WithCls():
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# execute before run block
- # 可以不定义参数 *args
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def __enter__(self, *args):
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print("%s(%s) called " % (sys._getframe().f_code.co_name, args))
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res = True
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return res
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# 当block发生 异常、错误、exit等情况时调用
- # 必须定义 *args，接收异常等信息
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def __exit__(self, *args):
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print("%s(%s) called " % (sys._getframe().f_code.co_name,args))
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# raise exception
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res = False
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# not raise exception
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res = True
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return res
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# t = __enter__， 可以不加t
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with WithCls() as t:
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print("t is not the result of WithCls(), it is __enter__ returned")
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# will call __exit__, and exit
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raise NameError("Hi there")
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print("Never here")
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- exit(0)
参考:
http://blog.csdn.net/shuimuniao/article/details/8206812
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/26250550/viewspace-1816342/ ，如需转载，请注明出处，否则将追究法律责任。
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