permuting several lists (was Re: [Python-Dev] zip() and list-comprehension with commas)

[Jack Jansen]

parallel()/zip() have an other advantage: it would be easy to extend to let 
the loop continue until the longest of the items, with a keyword argument:
  parallel((1, 2), (3, 4, 5), missing=None) # or extend, or some other name
would return
  ((1, 3), (2, 4), (None, 5))

By the way: -1 on the name zip() and -0 on the name parallel(), but +1 on the 
concept.
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