Sequence-spreading

[Rikard Bosnjakovic]

Hi.

I made a small spreading-sequence with the following code:

------
arg = "some string"
pm = 3
offsets = []
for i in xrange(pm):
    everyX = filter(lambda y: not divmod(y, pm)[1], range(len(arg)))
    added = map(lambda x: x+i, everyX)
    offsets.append(filter(lambda x: x<len(arg), added))

print offsets
------

which gives the correct result:

>>> ## working on region in file /usr/tmp/python-3115DCp...
[[0, 3, 6, 9], [1, 4, 7, 10], [2, 5, 8]]

"pm" is the number of sequences, and then the sequences are increasing.
0 in first, 1 in second, 2 in third, 3 in first and so on, until the
length of the string 'arg' is reached.  However, the loop-code is pretty
unreadable and awkward.

Anyone got a better solution for it?



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