[Python-Dev] PEP 389: argparse - new command line parsing module
fuzzyman at voidspace.org.uk
Sat Oct 3 18:40:45 CEST 2009
Yuvgoog Greenle wrote:
> On Sat, Oct 3, 2009 at 7:21 PM, Michael Foord <fuzzyman at voidspace.org.uk> wrote:
>> Why not just catch SystemExit? If you want a custom exception the overriding .exit() should be sufficient.
>> I'd be much more interested in Guido's suggestion of auto-generated custom help messages for sub-commands.
> Check it out:
> def ParseAndRun():
> # Argparse blah blah
> if __name__ == "__main__":
> except SystemExit:
> # was it crazy_external_function_that_might_exit or an argparse error?
> I know this might come through as bike shedding but it's just
> customary python that every module have it's own exception types as to
> not mix them up with others.
Then subclass and override .exit() as discussed - or put proper
exception handling around the call to parse_args() (optionally
rethrowing with whatever custom exception type you wish).
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