En Mon, 06 Jul 2009 19:49:41 -0300, MRAB <python at mrabarnett.plus.com> escribió: > Chris Rebert wrote: >> from collections import defaultdict >> counts = defaultdict(lambda: 0) >> > Better is: > counts = defaultdict(int) For speed? This is even faster: zerogen = itertools.repeat(0).next counts = defaultdict(zerogen) -- Gabriel Genellina