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Re: Why is the argparse module so inflexible?

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Date Sat, 29 Jun 2013 16:58:42 +0100
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On 29/06/2013 06:28, Steven D'Aprano wrote:
> On Fri, 28 Jun 2013 18:36:37 -0700, 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.
>
> [emphasis added]
>
>>> 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?
>
> Yes, really.
>
[snip]
+1

It's the job of argparse to parse the arguments. What should happen if
they're invalid is for its caller to decide.

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Thread

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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