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exit code of a script that raises an Exception?

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  exit code of a script that raises an Exception? thequietcenter@gmail.com - 2014-09-09 06:55 -0700
    Re: exit code of a script that raises an Exception? thequietcenter@gmail.com - 2014-09-09 07:41 -0700
    Re: exit code of a script that raises an Exception? Ned Batchelder <ned@nedbatchelder.com> - 2014-09-09 11:22 -0400

#77728 — exit code of a script that raises an Exception?

Hello, after looking at the docs for Exception:
https://docs.python.org/2/library/exceptions.html

I do not see any information on the guaranteed exit code a script that exits because Python threw an exception.

I wonder if all exceptions throw the exact same non-zero exit code, or whether a specific exit code is assigned to each exception uniquely. Or whether the exit code behavior is undefined (especially since it appears to be undocumented).

Thanks,
Terrence

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#77733

On Tuesday, September 9, 2014 9:56:04 AM UTC-4, thequie...@gmail.com wrote:

> I wonder if all exceptions throw the exact same non-zero exit code, or whether a specific exit code is assigned to each exception uniquely. Or whether the exit code behavior is undefined (especially since it appears to be undocumented).
> 

Just found sys.excepthook. I see that there is no sys.exit() call in its documented behavior: https://docs.python.org/2/library/sys.html


sys.excepthook(type, value, traceback)
This function prints out a given traceback and exception to sys.stderr.

When an exception is raised and uncaught, the interpreter calls sys.excepthook with three arguments, the exception class, exception instance, and a traceback object. In an interactive session this happens just before control is returned to the prompt; in a Python program this happens just before the program exits. The handling of such top-level exceptions can be customized by assigning another three-argument function to sys.excepthook.

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#77737

On 9/9/14 9:55 AM, thequietcenter@gmail.com wrote:
> Hello, after looking at the docs for Exception:
> https://docs.python.org/2/library/exceptions.html
>
> I do not see any information on the guaranteed exit code a script that exits because Python threw an exception.
>
> I wonder if all exceptions throw the exact same non-zero exit code, or whether a specific exit code is assigned to each exception uniquely. Or whether the exit code behavior is undefined (especially since it appears to be undocumented).
>
> Thanks,
> Terrence
>

A quick check demonstrates that exceptions do not get distinct status 
codes.  BTW: how could they?, you can create new exception types, there 
is not a bounded number of them.

On my Mac, Python 2.7 exited with a status code of 1 for 
ZeroDivisionError, NameError, SyntaxError, IndexError, and KeyError.

-- 
Ned Batchelder, http://nedbatchelder.com

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