python sys.exit在尝试中不起作用 [英] python sys.exit not working in try

问题描述

Python 2.7.5 (default, Feb 26 2014, 13:43:17)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-4)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> try:
...  sys.exit()
... except:
...  print "in except"
...
in except
>>> try:
...  sys.exit(0)
... except:
...  print "in except"
...
in except
>>> try:
...  sys.exit(1)
... except:
...  print "in except"
...
in except

为什么在尝试中无法触发sys.exit()，任何建议... !!!

Why am not able to trigger sys.exit() in try, any suggestions...!!!

此处发布的代码具有所有版本详细信息.

The code posted here has all the version details.

我尝试了所有可能触发它的方法，但是我失败了. 进入"except"块.

I have tried all possible ways i know to trigger it, but i failed. It gets to 'except' block.

先谢谢了.

推荐答案

sys.exit()引发异常，即SystemExit.这就是为什么您要进入except块的原因.

sys.exit() raises an exception, namely SystemExit. That's why you land in the except-block.

请参见以下示例:

import sys

try:
    sys.exit()
except:
    print(sys.exc_info()[0])

这给您:

<type 'exceptions.SystemExit'>

尽管我无法想象有任何实际的理由这样做，但是您可以使用此构造:

Although I can't imagine that one has any practical reason to do so, you can use this construct:

import sys

try:
    sys.exit() # this always raises SystemExit
except SystemExit:
    print("sys.exit() worked as expected")
except:
    print("Something went horribly wrong") # some other exception got raised

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