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Re: Enchancement suggestion for argparse: intuit type from default

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Date Thu, 15 Mar 2012 16:59:08 +1100
From Cameron Simpson <cs@zip.com.au>
To Ben Finney <ben+python@benfinney.id.au>
Subject Re: Enchancement suggestion for argparse: intuit type from default
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On 15Mar2012 12:22, Ben Finney <ben+python@benfinney.id.au> wrote:
| Roy Smith <roy@panix.com> writes:
| > 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.
| 
| −1, then. It's growing too many special cases, and is no longer simple
| to describe, so that indicates it's probably a bad idea.

If `type` is not supplied and `default` is present and not None, `type`
shall be the type of `default`.

That seems straightforward to me. It's a single sentence, easy to read
and understand, and potentially saves a lot of code verbiage (gratuitous
type= prarameters). I say "gratuitous" because unless `default` is a
sentinel for "no option supplied", the `type` should always match
type(default). Or am I wrong about that?

Cheers,
-- 
Cameron Simpson <cs@zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

You only live once in life, but if you do it right, once is enough!
        - Rob Castro <rdc8@columbia.edu>

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Thread

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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