Reverse zip() ?

[Casey McGinty]

> The corner case is when dealing with empty lists and there aren't
> enough items to unpack.
>
>
Another solution to zip(), with a slightly different behaviour for conner
cases ....

>>> a = (1,2,3)
>>> b = (1,2,3)
>>> c = (1,2,3,4)
>>> zip(a,b)
[(1, 1), (2, 2), (3, 3)]
>>> map(None,a,b)
[(1, 1), (2, 2), (3, 3)]
>>> zip(a,c)
[(1, 1), (2, 2), (3, 3)]
>>> map(None,a,c)
[(1, 1), (2, 2), (3, 3), (None, 4)]
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