PRACTICE QUIZ 2, Swarthmore College Fall 2008

Q1] For each of the following four expressions, show the value that will
be returned by the Python interpreter.  Assume that you already have
text = "swarthmore college" and you have imported the string library using 
from string import *.

split(text)

upper(text)

text[1:5]

"4" + text[11:20] + "5"

Q2] What is the output of the following program?

def main():
    word = "boz"
    result = ""
    for letter in word:
        result = result + chr(ord(letter) - 1)
    print result

Q3] Consider the program below which is intended to determine whether a
given number is negative, zero, or positive. 

def testNumber():
    n=input("Enter a number: ")
    if n < 0:
        print "negative"
    if n > 0:
        print "positive"
    else:
        print "zero"

What will be printed if the user enters 5 at the prompt?
What will be printed if the user enters -5 at the prompt?
What will be printed if the user enters 0 at the prompt?
Does the program give the desired result?
If not, write a corrected version below.

Q4] A person is eligible to be a US senator if he or she is at least 30
years old and has been a citizen for at least 9 years.  Write a
program that takes a person's age and years of citizenship as input
and returns their eligibility for the Senate.  For example:

>>> main()
Enter your age >> 30
Enter years US citizen >> 5
Eligibility for the Senate:
You have not been a US citizen long enough.

>>> main()
Enter your age >> 30
Enter years US citizen >> 10
Eligibility for the Senate:
You are eligible!

>>> main()
Enter your age >> 29
Enter years US citizen >> 10
Eligibility for the Senate:
You are too young.


Q5] Finish the code for the program below so that it produces the following
pattern of stars of some size, n, entered by the user (in this example, n is 4):

* * * *
  * * *
    * *
      *

def main() :

   print "This program prints out a pattern of stars"
   n = input("Enter a value for the size of the pattern: ")