CS5nm, UC Santa Barbara, Fall 2008         E02 practice, 11/12/2008

Name __________________________________________________________________

UMail Address: ____________________________________________ @ umail.ucsb.edu

This in-class exercise reviews scope of variables (local vs. global), and fruitful vs. void functions
(Textbook: Chapters 3 and 6, especially Section 3.9)

On this exercise, you may collaborate with others in answering these questions.

1. Suppose we have the following function definitions:
   

   def printTwice(msg):
       print msg
       print msg
   
      
   def catAndPrintTwice(part1, part2):
       cat = part1 + part2
       printTwice(cat)
   

   1. (1 pts) Is the function printTwice() fruitful or void?
      
      Circle one:       fruitful        void
      
      
   2. (1 pts) Is the function catAndPrintTwice() fruitful or void?
      
      Circle one:       fruitful        void
      
      
   3. (1 pts) Suppose these function definitions are loaded into Python. There are two transcripts below, one of which is real, and the other is total fiction.
      
      Which one shows how Python really works? Circle one:       version 1        version 2
      
      

      version 1	version 2
      >>> printTwice("Gauchos") Gauchos Gauchos >>> msg 'Gauchos' >>>	>>> printTwice("Gauchos") Gauchos Gauchos >>> msg Traceback (most recent call last): File "", line 1, in msg NameError: name 'msg' is not defined >>>

   4. (2 pts) Now explain briefly why the version you chose is the correct one.
      (One or two sentences is enough—keep your answer consise and accurate.)
      
      
      
      
      

2. Suppose we have the following function definitions:
   

       
   def doubleMsg(msg):
       twice = msg + "\n" + msg
       return twice
      
   def printDoubleMsg(part1, part2):
       cat = part1 + part2
       print doubleMsg(cat)
       return
   
   
   
   
   

   1. (1 pts) Is the function doubleMsg() fruitful or void?
      
      Circle one:       fruitful        void
      
      
   2. (1 pts) Is the function printDoubleMsg() fruitful or void?
      
      Circle one:       fruitful        void
      
      
   3. (3 pts) Suppose these function definitions are loaded into Python. There are two transcripts below, one of which is real, and the other two are total fiction.
      
      Which one shows how Python really works? Circle one:     version 1     version 2     version 3
      
      

      version 1	version 2	version 3
      >>> x = doubleMsg("Gauchos") >>> printDoubleMsg("Go","Gauchos") GoGauchos GoGauchos >>> part2 Traceback (most recent call last): File "", line 1, in part2 NameError: name 'part2' is not defined >>> cat 'GoGauchos\nGoGauchos' >>>	>>> x = doubleMsg("Gauchos") >>> printDoubleMsg("Go","Gauchos") GoGauchos GoGauchos >>> part1 Traceback (most recent call last): File "", line 1, in part1 NameError: name 'part1' is not defined >>> x 'Gauchos\nGauchos' >>>	>>> x = doubleMsg("Gauchos") Gauchos Gauchos >>> printDoubleMsg("Go","Gauchos") GoGauchos GoGauchos >>> part1 'Go' >>> x Traceback (most recent call last): File "", line 1, in part1 NameError: name 'x' is not defined >>>

(end, ex13)