This isn't really a question about list
comprehensions as you are using a "feature"
of map by passing None as the function to be
executed over each list element:
This works when len(x) > len(y):
zip(x,y+(len(x)-len(y))*[None])
This works when len(y) >=0 len(x):
zip(x+(len(x)-len(y))*[None],y)
I would probably wrap into function:
def foo(x,y):
if len(x) > len(y):
return zip(x,y+(len(x)-len(y))*[None])
return zip(x+(len(x)-len(y))*[None],y)
Larry Bates
David Isaac wrote:
> Newbie question:
>
> 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'?)
>
> Thanks,
> Alan Isaac
>
>
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