Iterating a sequence two items at a time

[Ulrich Eckhardt]

Ulrich Eckhardt wrote:
> I have a list [1,2,3,4,5,6] which I'd like to iterate as (1,2), (3,4),
> (5,6). I can of course roll my own, but I was wondering if there was
> already some existing library function that already does this.
> 
> 
> def as_pairs(seq):
>     i = iter(seq)
>     yield (i.next(), i.next())

Obviously this code does _not_ do what I want, it must be like this:

 def as_pairs(seq):
     i = iter(seq)
     while True:
         yield (i.next(), i.next())

Gah!

Uli

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