a better way to invert a list?

Ian Kelly ian.g.kelly at gmail.com
Wed Apr 6 22:08:45 CEST 2011


On Wed, Apr 6, 2011 at 1:51 PM, Paul Rubin <no.email at 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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