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[Python-Dev] map(None, ...) in tutorial

Guido van Rossum guido at python.org
Thu Aug 14 16:03:12 EDT 2003 
> I've noticed this section in the tutorial:
> 
>     [...], we see that map(None, list1, list2) is a convenient way of
>     turning a pair of lists into a list of pairs.  For example:
> 
>     >>> map(None, seq, map(square, seq))
>     [(0, 0), (1, 1), (2, 4), (3, 9), (4, 16), (5, 25), (6, 36), (7, 49)]
> 
> I think the example be changed to use zip() instead, ie:
> 
>     >>> zip(seq, map(square, seq))
>     [(0, 0), (1, 1), (2, 4), (3, 9), (4, 16), (5, 25), (6, 36), (7, 49)]
> 
> Any objections?

But then it's no longer an example of the usefulness of map(None, x, y)?

(Well, map(None, ...) is never useful, so maybe that's okay...)

--Guido van Rossum (home page: http://www.python.org/~guido/)
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