a better way to invert a list?

Wed Apr 6 16:08:45 EDT 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.