Python: groupby with itemgetter

gistfile1.py

# Python: groupby with itemgetter
from itertools import groupby
from operator import itemgetter

# [title, groupID, description]
seq = [["nameA", 0, "descriptionA"], ["nameB", 1, "descriptionB"], ["nameC", 0, "descriptionC"]]
seq.sort(key = itemgetter(1))
groups = groupby(seq, itemgetter(1))
print [[item[0] for item in data] for (key, data) in groups]

# The result:
# [['nameA', 'nameC'], ['nameB']]

See followings:

http://stackoverflow.com/questions/5695208/group-list-by-values
http://stackoverflow.com/questions/17243620/operator-itemgetter-or-lambda
http://stackoverflow.com/questions/11287207/why-should-i-use-operator-itemgetterx-instead-of-x