David Isaac wrote:
> I have been generally open to the proposal that list comprehensions
> should replace 'map', but I ran into a need for something like
> map(None,x,y)
> when len(x)>len(y). I cannot it seems use 'zip' because I'll lose
> info from x. How do I do this as a list comprehension? (Or,
> more generally, what is the best way to do this without 'map'?)
If you know that len(x)>=len(y) and you want the same behavior as
map() you can use itertools to synthesize a longer iterator
>>> x = [1,2,3,4,5,6]
>>> y = "Hi!"
>>> from itertools import repeat, chain
>>> zip(x, chain(y, repeat(None)))
[(1, 'H'), (2, 'i'), (3, '!'), (4, None), (5, None), (6, None)]
>>>
This doesn't work if you want the result to be max(len(x), len(y))
in length - the result has length len(x).
As others suggested, if you want to use map, go ahead. It won't
disappear for a long time and even if it does it's easy to
retrofit if needed.
Andrew
[EMAIL PROTECTED]
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