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Re: Idiomatic Python for incrementing pairs

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  Re: Idiomatic Python for incrementing pairs Jason Swails <jason.swails@gmail.com> - 2013-06-08 07:37 -0400

#47379 — Re: Idiomatic Python for incrementing pairs

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On Sat, Jun 8, 2013 at 2:47 AM, Peter Otten <__peter__@web.de> wrote:
>
> You can hide the complexity in a custom class:
>
> >>> class T(tuple):
> ...     def __add__(self, other):
> ...             return T((a+b) for a, b in zip(self, other))
> ...
> >>> t = T((0, 0))
> >>> for pair in [(1, 10), (2, 20), (3, 30)]:
> ...     t += pair
> ...
> >>> t
> (6, 60)
>
> (If you are already using numpy you can do the above with a numpy.array
> instead of writing your own T.)
>

I do this frequently when I want data structures that behave like vectors
but don't want to impose the numpy dependency on users. (Although I usually
inherit from a mutable sequence so I can override __iadd__ and __isub__).
It seemed overkill for the provided example, though...

All the best,
Jason

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