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Sun Sep 8 19:45:32 CEST 2013 · https://mail.python.org/pipermail/python-dev/2013-September/128431.html

On Sun, Sep 8, 2013 at 9:32 PM, Guido van Rossum <guido at python.org> wrote:

> - Parallel arrays or arrays of tuples? I think the API should require
> an array of tuples. It is trivial to zip up parallel arrays to the
> required format, while if you have an array of tuples, extracting the
> parallel arrays is slightly more cumbersome.
>

I agree with your conclusion but not with the rationale: converting between
array of tuples and parallel arrays is trivial both ways:

>>> at = [(1,2,3), (4,5,6), (7,8,9), (10, 11, 12)]
>>> zip(*at)
[(1, 4, 7, 10), (2, 5, 8, 11), (3, 6, 9, 12)]
>>> zip(*_)
[(1, 2, 3), (4, 5, 6), (7, 8, 9), (10, 11, 12)]

(Note that zip(*x) is basically transpose(x).)
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