如何绕过python中sys.exit()的0-255范围限制? [英] How to bypass the 0-255 range limit for sys.exit() in python?

问题描述

在python(在Linux系统上)中，我正在使用os.system()启动命令并获取返回码.如果该返回码不同于0，我想使用相同的返回码退出程序.所以我写道:

In python (on a Linux system), I'm launching a command using os.system() and retrieving the return code. If that return code is different from 0, I would like to make the program exit with that same return code. So I wrote:

ret = os.system(cmd)
if ret != 0:
   print "exit with status %s" % ret
   sys.exit(ret)

当返回码小于256时，它可以正常工作，但是当返回码大于255时，使用的退出码为0.如何使sys.exit()接受大于255的代码?

When the return code is lower than 256, it works fine, but when it's greater than 255, the exit code used is 0. How can I make sys.exit() accept codes greater than 255?

限制实际上是255

实际上，ret变量接收256，但是sys.exit()无法使用它，因此程序将返回0.手动启动cmd时，我看到它返回1，而不是256.

In fact, the ret variable receives 256, but sys.exit() fails to use it, so the program returns 0 instead. When I launch cmd manually, I see that it returns 1, not 256.

推荐答案

为我工作(CentOS 5.5，Python 2.6.5):

Works for me (CentOS 5.5, Python 2.6.5):

$ python
>>> import sys
>>> sys.exit(245)
$ echo $?
245

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