# coding: utf8 #

from itertools import groupby

d = [ [1 , 'test1'] , [2 , 'text2'] , [1 , 'tut text'] , [2 , 'text text'] , [3 , 'other text'] ]

for k,g in groupby(d, lambda x:x[0]):
    print k,
    for j in g:
        print j,
    print ''

# coding: utf8 #

from itertools import groupby

d = [ [1 , 'test1'] , [2 , 'text2'] , [1 , 'tut text'] , [2 , 'text text'] , [3 , 'other text'] ]

for k,g in groupby(sorted(d), key = lambda x:x[0]):
    print k,
    for j in g:
        print j,
    print ''