1 s = "Hello" 2 s += " world!" 3 print s # Hello world! 4 5 s2 = "Hello worlds!" 6 print s2 # Hello worlds! 7 print s < s2 # True 8 print s <= s2 # True 9 print s == s2 # False 10 print s != s2 # True 11 print s >= s2 # False 12 print s > s2 # False 13 14 print s[0] # H 15 print s[-1] # !