Chapter 4

True/False

1. False
   
2. True
3. False
4. True
5. True
6. True
7. True
8. False
9. True
10. False
    

Multiple Choice

1. d
   
2. c
3. a
4. c
5. c
6. d
7. b
8. c
9. c
10. a

Discussion

1. These can be checked interactively.
1. 'The knights who say ni!'
2. 'spamspamspamni!ni!'
3. 'p'
4. 'pa'
5. 'ani'
6. 'spam!'
7. 'SPAM'
8. 'NI! NI! NI! '
2. Answers may vary and can be checked interactively.
1. string.upper(s2[:-1])
2. s2+s1+s2
3. ((string.capwords(s1+" "+s2)+"  ")*3)[:-2]
4. s1
5. string.split(s1,"a")
6. string.join(string.split(s1,"a"),"")
3. Answers can be checked interactively.

1. a
   a
   r
   d
   v
   a
   r
   k

2. Now
   is
   the
   winter
   of
   our
   discontent...

3. M ss ss pp
4. scrt
5. tfdsfu
4. Answers can be checked interactively.
1. 'Looks like spam and eggs for breakfast'
2. 'There is 1 spam 4 you'
3. Error -- More values than slots
4. '2.30 2.35'
5. '2.30000 2.34680'
6. 'Time left 01:37.37'
7. Error -- Value should be an int
5. Private keys must be known by both parties ahead of time. When contacting sites on the internet, say for e-commerce, there would be no practical way for the parties to exchange the private key.

Programming Exercises