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wishlist item: itertools.parti tion (WAS: Wishlist item: itertools.flatt en)

ge*******@gmail .com wrote:
window / cons / fencepost / slice functions: +1

(with a flag to say if you want to truncate or pad incomplete tuples
at end of input sequence.

http://aspn.activestate.com/ASPN/Coo.../Recipe/303279
http://aspn.activestate.com/ASPN/Coo.../Recipe/303060
http://aspn.activestate.com/ASPN/Coo.../Recipe/347689

Probably more recipes in there, (and not CPAN-ish yet) but multiple
submissions bespeak a certain need, i think.


Yes, also worth noting is the thread:

http://mail.python.org/pipermail/pyt...ry/263004.html

which concludes with:

from itertools import islice, chain, repeat

def partition(itera ble, part_len):
itr = iter(iterable)
while 1:
item = tuple(islice(it r, part_len))
if len(item) < part_len:
raise StopIteration
yield item

def padded_partitio n(iterable, part_len, pad_val=None):
padding = repeat(pad_val, part_len-1)
itr = chain(iter(iter able), padding)
return partition(itr, part_len)

STeVe
Jul 18 '05 #1
0 1088

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