On Fri, Nov 28, 2003 at 01:46:53PM -0800, Guido van Rossum wrote:
I would make one change: after looking at another use case, I'd like to change the outer iterator to produce (key, grouper) tuples. This way, you can write things like
totals = {} for key, group in sequence: totals[key] = sum(group)
I think this would be helpful for lazy coders if some function of itertools cover the use case: (`LIMIT' keyword of SQL)
from groupby import groupby alwaystrue = lambda n: True for k, g in groupby(alwaystrue, range(20), 5): ... print list(g) ... [0, 1, 2, 3, 4] [5, 6, 7, 8, 9] [10, 11, 12, 13, 14] [15, 16, 17, 18, 19]
prototype of this case is groupby(keyfunc, iterable, limit=None). Either, groupby(5, range(20)) is okay but 5 is not a sort of `key'. :) Hye-Shik