1 __author__ = 'liunnis' 2 #-*-coding:utf-8 -*- 3 a=[1,2,3,4,4] 4 print a 5 print list(set(a)) 6 b=[str(i) for i in a] 7 print list(set(b)) 8 #the result is 9 # [1, 2, 3, 4, 4] 10 # [1, 2, 3, 4] 11 # ['1', '3', '2', '4'] 12 c=[[1,2],[3,4],[5,5],[6,6],[7,8],[9,0],10,[11]] 13 print c 14 try: 15 print set(c) 16 except TypeError,e: 17 print'Error:',e 18 #the result is 19 # [[1, 2], [3, 4], [5, 5], [6, 6], [7, 8], [9, 0], 10, [11]] 20 # Error: unhashable type: 'list'