Robocop <btha...@physics.ucsd.edu> writes: > I have a list of objects, each object having two relevant attributes: > date and id. I'd like not only organize by id, but also by date. > I.e. i would like to parse my list into smaller lists such that each > new mini-list has a unique date, but consists of only objects with a > specific id. Are there any handy imports i could use to accomplish > something like this? I'm relatively new to python and as such don't > know all of the preloaded functions at my disposal. Thanks for any > help in advance, the community here is always ridiculously helpful.
Look at itertools.groupby. E.g. from itertools import groupby data = [ my objects ] def getdate(x): return x.date by_date = {} for date, objs in groupby(sorted(data, key=getdate), getdate): by_date[date] = list(objs) # list(objs) is the list of all objects in data whose date is date I'm sorry if this is a bit terse... -- Arnaud -- http://mail.python.org/mailman/listinfo/python-list