Ben Finney schrieb: > Nick Coghlan <ncogh...@gmail.com> writes: > >> I would be a lot happier if argparse as a standard library module just >> followed optparse's lead here (i.e. defined '--version' only and punted >> on the shorthand form). >> >> 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). >> >> 2. For Python 3.2, don't create the "-v" shorthand at all (i.e. only >> create "--version"). > > +1 > > As someone who uses the existing ‘optparse’ behaviour to implement a > number of Unix command-line programs, the above all makes more sense for > ‘argparse’ in the standard library if we're expecting it to be a smooth > upgrade.
Guys, thanks for your feedback. Let me see; the suggestion involves the '-v' being set in Python 2.7 by default, but to another action, which yields a DeprecationWarning /and/ performs the version action, right? The drawback would be: The '-v' wouldn't be available for other uses. But I use it all the time (for verbosity). I don't see why we shouldn't drop the '-v' altogether; where Python standard libraries are concerned, argparse is a new module, and no compatibility can be broken; people will expect this to follow the optparse habits. Programs developed against former versions of argparse will continue to work, too; there will just not be a (non-standard) short option generated, but the long option '--version' will be still there. Honestly, how frequently do you query program versions? Unfortunately adding a new '-V' default action /could/ break existing programs, since people might have worked around the former default; thus we couldn't do this. Let's get rid of the default '-v' /now/. This is clean, this is easy, it won't break anything (with the possible exception of "prog -v" version output parsers who deserve no better), and we would be done with it. -- Tobias _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
