Compsci 06/101, Spring 2012, February 7

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  1. What is the value of the string variable st when the code below executes? Explain (to yourself or the class, you don't have to write it down) your answer. 
      word = "creation"
  st = ""
  for i in range(0,len(word)):
      if i % 2 == 0:
          st = st + word[i]

  print st   # value here?
    1. "ceto"
    2. "rain"
    3. "ratio"

  2. A five letter word is printed by the code below, what is it? 
      words = ["self", "contained", "underwater", "breathing", "apparatus"]
  abb = ""
  for w in words:
      abb = abb + w[1]
  print abb
    1. "scuba"
    2. "eonrp"
    3. "secounbrap"

    The Yahtzee/ScoreIt APT was suggested for the Yahtzee/Scoreit APT in which you determine the maximal score in the "above the line" section of a Yahtzee game. The idea is expressed in the code below to process the list toss, where toss has five-values 1-6 representing die rolls. For purposes of this exposition assume toss=[3,2,5,3,5] -- the first step is to count the number of occurrences of each possible die-roll.

    toss = [3,2,5,3,5] counts = [0,1,2,0,2,0] # what expression creates this? # missing code here
  3. Which of the following is the correct list comprehension for counts? 
    1.    counts = [toss.count(i) for i in toss]

    2.    counts = [toss.count(i) for i in range(1,7)]

    3.    counts = [toss[i] for i in range(1,7)]

  4. Which of the following is the correct list comprehension so that the body of the function is one line using toss as shown: 

    1.    return max([i*toss.count(i) for i in range(1,7)])

    2.    return max([toss[i]*toss.count(i) for i in range(1,7)])

    3.    return max([i*toss[i] for i in range(1,7)])

    4.    return max([i*toss.count(i) for i in toss])