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Groups > comp.lang.python > #21642

Re: Enchancement suggestion for argparse: intuit type from default

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On 15/03/2012 00:52, Roy Smith wrote:
> In article<4f612a9d$0$12033$742ec2ed@news.sonic.net>,
>   John Nagle<nagle@animats.com>  wrote:
>
>>  On 3/13/2012 2:08 PM, Roy Smith wrote:
>>  >  Using argparse, if I write:
>>  >
>>  >       parser.add_argument('--foo', default=100)
>>  >
>>  >  it seems like it should be able to intuit that the type of foo should
>>  >  be int (i.e. type(default)) without my having to write:
>>  >
>>  >       parser.add_argument('--foo', type=int, default=100)
>>  >
>>  >  Does this seem like a reasonable enhancement to argparse?
>>
>>      default=None
>>
>>  presents some problems.
>
> I'll admit I hadn't considered that, but I don't see it as a major
> problem.  The type intuition could be designed to only work for types
> other than NoneType.

True, you could consider that a special case.

If you really do want NoneType, or if the type doesn't otherwise match
the default (or there's no default), then you can still be explicit.

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Enchancement suggestion for argparse: intuit type from default roy@panix.com (Roy Smith) - 2012-03-13 17:08 -0400
  Re: Enchancement suggestion for argparse: intuit type from default Ben Finney <ben+python@benfinney.id.au> - 2012-03-14 08:35 +1100
    Re: Enchancement suggestion for argparse: intuit type from default Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-03-14 12:53 +0000
      Re: Enchancement suggestion for argparse: intuit type from default Ben Finney <ben+python@benfinney.id.au> - 2012-03-15 00:19 +1100
        Re: Enchancement suggestion for argparse: intuit type from default Roy Smith <roy@panix.com> - 2012-03-14 09:30 -0400
          Re: Enchancement suggestion for argparse: intuit type from default MRAB <python@mrabarnett.plus.com> - 2012-03-14 17:26 +0000
          Re: Enchancement suggestion for argparse: intuit type from default Ian Kelly <ian.g.kelly@gmail.com> - 2012-03-14 13:03 -0600
  Re: Enchancement suggestion for argparse: intuit type from default rusi <rustompmody@gmail.com> - 2012-03-14 03:22 -0700
  Re: Enchancement suggestion for argparse: intuit type from default Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2012-03-14 13:26 +0100
  Re: Enchancement suggestion for argparse: intuit type from default John Nagle <nagle@animats.com> - 2012-03-14 16:32 -0700
    Re: Enchancement suggestion for argparse: intuit type from default Roy Smith <roy@panix.com> - 2012-03-14 20:52 -0400
      Re: Enchancement suggestion for argparse: intuit type from default Ben Finney <ben+python@benfinney.id.au> - 2012-03-15 12:22 +1100
        Re: Enchancement suggestion for argparse: intuit type from default Cameron Simpson <cs@zip.com.au> - 2012-03-15 16:59 +1100
        Re: Enchancement suggestion for argparse: intuit type from default Robert Kern <robert.kern@gmail.com> - 2012-03-15 10:06 +0000
          Re: Enchancement suggestion for argparse: intuit type from default Roy Smith <roy@panix.com> - 2012-03-15 09:28 -0400
            Re: Enchancement suggestion for argparse: intuit type from default Cameron Simpson <cs@zip.com.au> - 2012-03-16 08:18 +1100
      Re: Enchancement suggestion for argparse: intuit type from default MRAB <python@mrabarnett.plus.com> - 2012-03-15 02:10 +0000

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