How to sort the below array of dates on python 2.4
timestamps = [\'2011-06-2\', \'2011-08-05\', \'2011-02-04\', \'2010-1-14\', \'2010-12-13\', \'2010-1-12\'
print(sorted(list_of_strings,key=lambda x :(int(x.split('-')[0]),int(x.split('-')[1]),int(x.split('-')[2])))