[Python-Dev] PEP 389: argparse - new command line parsing module (original) (raw)

Michael Foord fuzzyman at voidspace.org.uk
Sat Oct 3 17:17:36 CEST 2009

Steven Bethard wrote:

On Sat, Oct 3, 2009 at 3:45 AM, Yuvgoog Greenle <ubershmekel at gmail.com> wrote:

I haven't checked if it's possible, but I suggest Argparse have it's own exception class that inherits from SystemExit and that exception would be thrown.

ParseError, or something similar. I suggest this just because it would be more readable I guess and would exactly explain why this code exits. I've never seen such an idiom before (subclassing SystemExit) but it would certainly be possible create an ArgumentParserExit exception like that. Then you would have your choice of overriding .exit() or catching the exception. Steve 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.

Michael

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