Berkeley CSUA MOTD:Entry 45449
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2025/07/11 [General] UID:1000 Activity:popular
7/11    

2006/12/14-16 [Computer/SW/Languages/Misc, Computer/SW/Languages/Python] UID:45449 Activity:kinda low
12/14   Does anyone know how to get python to return an exit status
        at the end of a script?  The only way I seem to be able to get it
        to work is to use sys.exit(), otherwise I always get 0.  Seems
        kinda lame to end all my scripts with sys.exit though.
        \_ Use sys.exit.  See:
           http://www.artima.com/weblogs/viewpost.jsp?thread=4829
           -dans
2025/07/11 [General] UID:1000 Activity:popular
7/11    

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www.artima.com/weblogs/viewpost.jsp?thread=4829
Next All Things Pythonic Python main() functions by Guido van Rossum May 15, 2003 Summary For Python programmers, I've got some suggestions on how to write a main() function that's easy to invoke in other contexts, eg from the interactive Python prompt when you feel like experimenting. They usually have a structure roughly like this: """Module docstring. exit # process arguments for arg in args: process(arg) # process() is defined elsewhere if __name__ == "__main__": main() I'm sure many people write similar main() functions. I've got a few suggestions that make main() a little more flexible, especially as option parsing becomes more complex. argv might have been changed by the time the call is made; the default argument is calculated at the time the main() function is defined, for all times. The remedy is to let main()'s return value specify the exit status. exit(main This gives the main() function a single exit point, which is preferable over multiple return 2 statements. This also makes it easier to refactor the argument parsing: raise Usage works just fine from inside a helper function, but return 2 would require careful passing on of the return values. You might think that taking this to the extreme would move the try/except clause out of the main() function, into the code at the end of the module (if __name__ == "__main__": .... But that would mean that when you call main() interactively, you'd get a traceback for command line syntax errors, which isn't very helpful. However, another generalization can be helpful: define another exception, perhaps called Error, which is treated just like Usage but returns 1 This can then be used for expected errors like failure to open necessary files, which are not command line syntax errors, but yet expected, and where again a traceback doesn't feel very friendly. Guido van Rossum is the creator of Python, one of the major programming languages on and off the web. The Python community refers to him as the BDFL (Benevolent Dictator For Life), a title straight from a Monty Python skit. He moved from the Netherlands to the USA in 1995, where he met his wife. Until July 2003 they lived in the northern Virginia suburbs of Washington, DC with their son Orlijn, who was born in 2001.