1 l = [1, 2, 3] 2 l.append("four") 3 print len(l) # 3 4 print l[0] # 1 5 print l[1] # 2 6 print l[2] # 3 7 print l[3] # four 8 print l[-1] # four 9 print l[-2] # 3 10 print l[-3] # 2 11 print l[-4] # 1 12 print l # [1, 2, 3, "four"] 13 14 t = (1, 2, 3, "four") 15 l = list(t) 16 print l # [1, 2, 3, "four"] 17 18 try: 19 print l[4] # should raise an exception 20 except IndexError, exc: 21 print "l[4]: failed with argument", exc.index 22 23 try: 24 print l[-5] # should raise an exception 25 except IndexError, exc: 26 print "l[-5]: failed with argument", exc.index