[Tutor] sorting lists into sub lists based on a key

[Iyer]

if I have a list of lists, that goes like this: [[0,['a','b']],[0,['c','d']],[3,['f','g']], [0,['a','b']],[0,['c','d']], [3,['f1','f2']], [2,['zz','dd']]]

what could be the best way to reorder this such that the sublists with the same first element go into their own sub-list ?

like, 

sublist0 = [0,['a','b']],[0,['c','d']],[0,['a','b']],[0,['c','d']]

sublist2 = [2,['zz','dd']]

sublist3 [3,['f','g']], [3,['f1','f2']]

Does this seem to be the best way to do it ?

===============================================================================

from operator import itemgetter
from itertools import groupby

data_list = [[0,['a','b']],[0,['c','d']],[3,['f','g']], [0,['a','b']],[0,['c','d']], [3,['f1','f2']], [2,['zz','dd']]]
data_list.sort()

list1 = []

for key, items in groupby(data_list, key= itemgetter(0)):    
    list1.append(list(items))
       
print "After grouping the list by first value in each element:"
print list1

print "printing each sublist"
for i in list1:
    print i
    

===============================================================================

output :

After grouping the list by first value in each element:After grouping the list by first value in each element:
[[[0, ['a', 'b']], [0, ['a', 'b']], [0, ['c', 'd']], [0, ['c', 'd']]], [[2, ['zz', 'dd']]], [[3, ['f', 'g']], [3, ['f1', 'f2']]]]
printing each sublist
[[0, ['a', 'b']], [0, ['a', 'b']], [0, ['c', 'd']], [0, ['c', 'd']]]
[[2, ['zz', 'dd']]]
[[3, ['f', 'g']], [3, ['f1', 'f2']]]


       
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