list to list of pairs

Werner Schiendl ws-news at gmx.at
Tue Nov 20 11:01:37 CET 2001


Hi,

here an alternative way using generators (new in Python 2.2)

from __future__ import generators

def pieces(seq, num_item=2):
    start = 0
    while 1:
        item = seq[start:start+num_item]
        if not item:
            break
        yield item
        start += num_item

result = [item for item in pieces([1, 2, 3, 4, 5, 6])]
print result

result = [item for item in pieces([1, 2, 3, 4, 5, 6], 3)]
print result


- produces

[[1, 2], [3, 4], [5, 6]]
[[1, 2, 3], [4, 5, 6]]

hth
Werner

<bvdpoel at uniserve.com> wrote in message
news:3BF94B42.346E96EF at uniserve.com...
>
> I've sure I've seen this somewhere...but I can't today...
>
> I need to convert a list like [1,2,3,4,5,6] to a list of pairs [[1,2],
> [3,4], [5,6]]. Isn't there a way to do this with map() or zip()???
>
> --
> Bob van der Poel ** Wynndel, British Columbia, CANADA **
> EMAIL: bvdpoel at uniserve.com
> WWW:   http://users.uniserve.com/~bvdpoel





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