[Python-Dev] Python 2.7b1 and argparse's version action (original) (raw)

Tobias Herp Tobias.Herp at gmx.de
Sun Apr 18 23:48:55 CEST 2010

Steven Bethard schrieb:

On Sun, Apr 18, 2010 at 4:03 AM, Nick Coghlan <ncoghlan at gmail.com> wrote:

To deal with this in a backwards compatible way while remaining on the path to more conventional behaviour, I suggest the following:

1. For Python 2.7, deprecate just the "-v" default behaviour for the version. This means "--version" and "-v" will be set to invoke different actions when the version argument is supplied (the latter will trigger a deprecation warning if supplied, while the former will work normally). [...] All I can imagine you mean is to issue a deprecation warning whenever a user of the script provides "-v" at the command line, but that seems sketchy to me - we'd be deprecating features of someone's application, not features of the argparse library.

It would raise warnings when the option is /used/ (rather than defined; such warnings address programmers, though), and it wouldn't free '-v' for other uses.

I agree that this would be more complicated than necessary. It would be better to just drop the default usage of '-v'. This way we wouldn't need a deprecation procedure either.

-- Tobias

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