unzip array of arrays?

Chris Rebert clp2 at rebertia.com
Thu Jan 22 23:13:34 CET 2009


On Thu, Jan 22, 2009 at 2:04 PM, Tobiah <toby at tobiah.org> wrote:
> Although it's trivial to program, I wondered whether
> there was a builtin or particularly concise way to
> express this idea:
>
>> a = [(1, 2), (3, 4), (5, 6)]
>> field[a, 2]
> [2, 4, 6]
>
> where field() is some made up function.

Python 2.6 (r26:66714, Nov 18 2008, 21:48:52)
[GCC 4.0.1 (Apple Inc. build 5484)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> a= [(1, 2), (3, 4), (5, 6)]
>>> zip(*a)
[(1, 3, 5), (2, 4, 6)]
>>> zip(*a)[1]
(2, 4, 6)

Cheers,
Chris

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