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Re: Why is the argparse module so inflexible?

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On Saturday, June 29, 2013 7:06:37 AM UTC+5:30, Ethan Furman wrote:
> On 06/27/2013 03:49 PM, Steven D'Aprano wrote:
> > [rant]
> > I think it is lousy design for a framework like argparse to raise a
> > custom ArgumentError in one part of the code, only to catch it elsewhere
> > and call sys.exit. At the very least, that ought to be a config option,
> > and off by default.
> >
> > Libraries should not call sys.exit, or raise SystemExit. Whether to quit
> > or not is not the library's decision to make, that decision belongs to
> > the application layer. Yes, the application could always catch
> > SystemExit, but it shouldn't have to.
> 
> 
> So a library that is explicitly designed to make command-line scripts easier 
> and friendlier should quit with a traceback?
> 
> Really?

So a library that behaves like an app is OK?

Really?

I would have thought that with the sophistication of python's exception mechanism in place there would be corresponding peps in place proscribing such behavior.  In the same way that if I submitted my super-duper library for inclusion into python with 7 spaces indentation, some kind dev would reply with

http://www.python.org/dev/peps/pep-0008/#indentation

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Why is the argparse module so inflexible? Andrew Berg <robotsondrugs@gmail.com> - 2013-06-27 07:54 -0500
  Re: Why is the argparse module so inflexible? Roy Smith <roy@panix.com> - 2013-06-27 09:08 -0400
    Re: Why is the argparse module so inflexible? Andrew Berg <robotsondrugs@gmail.com> - 2013-06-27 08:49 -0500
    Re: Why is the argparse module so inflexible? Dave Angel <davea@davea.name> - 2013-06-27 12:02 -0400
      Re: Why is the argparse module so inflexible? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-06-27 22:49 +0000
        Re: Why is the argparse module so inflexible? Cameron Simpson <cs@zip.com.au> - 2013-06-28 09:34 +1000
        Re: Why is the argparse module so inflexible? Ethan Furman <ethan@stoneleaf.us> - 2013-06-28 18:36 -0700
          Re: Why is the argparse module so inflexible? rusi <rustompmody@gmail.com> - 2013-06-28 21:12 -0700
            Re: Why is the argparse module so inflexible? Terry Reedy <tjreedy@udel.edu> - 2013-06-29 00:37 -0400
              Re: Why is the argparse module so inflexible? Roy Smith <roy@panix.com> - 2013-06-29 10:12 -0400
                Re: Why is the argparse module so inflexible? Andrew Berg <robotsondrugs@gmail.com> - 2013-06-29 09:17 -0500
          Re: Why is the argparse module so inflexible? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-06-29 05:28 +0000
            Re: Why is the argparse module so inflexible? Marcin Szamotulski <mszamot@gmail.com> - 2013-06-29 13:38 +0100
            Re: Why is the argparse module so inflexible? MRAB <python@mrabarnett.plus.com> - 2013-06-29 16:58 +0100
            Re: Why is the argparse module so inflexible? Ethan Furman <ethan@stoneleaf.us> - 2013-06-29 12:17 -0700
        Re: Why is the argparse module so inflexible? Modulok <modulok@gmail.com> - 2013-06-28 19:39 -0600
        Re: Why is the argparse module so inflexible? Isaac To <isaac.to@gmail.com> - 2013-06-29 12:37 +0800
    Re: Why is the argparse module so inflexible? Robert Kern <robert.kern@gmail.com> - 2013-06-27 20:47 +0100

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