1 s = set() 2 s.add(10) 3 s.add(20) 4 s.add("c") 5 s.add((1, 2)) 6 7 print "# s:", 8 print s # set([10, 20, "c", (1, 2)) 9 print len(s) # 4 10 print 10 in s # True 11 print 20 in s # True 12 print "c" in s # True 13 print 30 in s # False 14 print (1, 2) in s # True 15 16 s2 = set([10, 20, "c", (1, 2)]) 17 18 print "# s2:", 19 print s2 # set([10, 20, "c", (1, 2)) 20 print len(s2) # 4 21 print 10 in s2 # True 22 print 20 in s2 # True 23 print "c" in s2 # True 24 print 30 in s2 # False 25 print (1, 2) in s2 # True 26 27 a = set([1, 3, 5, 7, 9]) 28 b = set([1, 2, 3, 5, 7]) 29 30 aub = a.union(b) 31 aib = a.intersection(b) 32 adb = a.difference(b) 33 asdb = a.symmetric_difference(b) 34 35 print len(aub) # 6 36 print len(aib) # 4 37 print len(adb) # 1 38 print len(asdb) # 2 39 print 40 print 1 in aub # True 41 print 1 in aib # True 42 print 1 in adb # False 43 print 1 in asdb # True 44 print 45 print 2 in aub # True 46 print 2 in aib # False 47 print 2 in adb # False 48 print 2 in asdb # False 49 print 50 print 9 in aub # True 51 print 9 in aib # False 52 print 9 in adb # True 53 print 9 in asdb # False 54 print 55 56 aub2 = a.copy() 57 aub2.update(b) 58 print len(aub2) # 6 59 60 aib2 = a.copy() 61 aib2.intersection_update(b) 62 print len(aib2) # 4 63 64 adb2 = a.copy() 65 adb2.difference_update(b) 66 print len(adb2) # 1 67 68 asdb2 = a.copy() 69 asdb2.symmetric_difference_update(b) 70 print len(asdb2) # 2