2009/8/17 MRAB <pyt...@mrabarnett.plus.com>: > Diez B. Roggisch wrote: >> >> Pierre wrote: >> >>> Hello Everyone, >>> >>> I would like to know if it is possible to extract a sub-list from a >>> list ? >>> >>> typically if : >>> >>> L =[[1, 2, 3],[4, 5, 6],[3] ] >>> >>> How to extract easily the elements 0 and 2 of L in order to get : >>> >>> L2 =[[1, 2, 3],[3] ] >>> >>> Moreover, I would like to know if it is possible to use logical >>> indexation such that : >>> >>> index = [ True, False, True] >>> L2 = L >>> >>> or usual indexation, something like >>> index=[0, 2] >>> L2 = L >>> >>> I tried, but failed... >>> Thanks for your help >> >> >> index = [ True, False, True] >> L2 = [v for i, v in enumerate(L) if index[i]] >> > Or: > > L =[[1, 2, 3],[4, 5, 6],[3] ] > index = [ True, False, True] > > from itertools import izip > L2 = [v for i, v in izip(index, L) if i] > Or in python 3.1
>>> import itertools >>> list(itertools.compress(data=[[1, 2, 3], [4, 5, 6], [3]], selectors=[True, >>> False, True])) [[1, 2, 3], [3]] vbr -- http://mail.python.org/mailman/listinfo/python-list
