Re: a better way to invert a list?

References	<2215eefd-3677-4459-8656-aa04978f6f3f@g7g2000pro.googlegroups.com> <7xwrj7kvjv.fsf@ruckus.brouhaha.com>
From	Ian Kelly <ian.g.kelly@gmail.com>
Date	2011-04-06 14:08 -0600
Subject	Re: a better way to invert a list?
Newsgroups	comp.lang.python
Message-ID	<mailman.84.1302120558.9059.python-list@python.org> (permalink)

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On Wed, Apr 6, 2011 at 1:51 PM, Paul Rubin <no.email@nospam.invalid> wrote:
>    In Haskell or ML, you can use patterns that contain wild
>    cards that play a role in the pattern-matching but don't establish any
>    binding. Can that be done in Python?
>
> Not as much.  You could say something like
>
>         sorted(enumerate(p), key=lambda(_,j): j)
>
> which gets the meaning across (it binds the symbol "_" though this
> doesn't escape the lambda).

That will just give you a SyntaxError.  Implicit tuple unpacking was
removed in Python 3.  It has to be done with an explicit assignment
statement now.

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a better way to invert a list? scattered <tooscattered@gmail.com> - 2011-04-05 14:17 -0700
  Re: a better way to invert a list? Ian Kelly <ian.g.kelly@gmail.com> - 2011-04-05 15:46 -0600
    Re: a better way to invert a list? scattered <tooscattered@gmail.com> - 2011-04-05 16:24 -0700
      Re: a better way to invert a list? Glazner <yoavglazner@gmail.com> - 2011-04-06 01:48 -0700
        Re: a better way to invert a list? scattered <tooscattered@gmail.com> - 2011-04-06 02:48 -0700
        Re: a better way to invert a list? Peter Otten <__peter__@web.de> - 2011-04-06 11:58 +0200
    Re: a better way to invert a list? Raymond Hettinger <python@rcn.com> - 2011-04-05 17:07 -0700
  Re: a better way to invert a list? Paul Rubin <no.email@nospam.invalid> - 2011-04-06 12:51 -0700
    Re: a better way to invert a list? Ian Kelly <ian.g.kelly@gmail.com> - 2011-04-06 14:08 -0600

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