Practice Midterm Spring 18 Answers

Part A

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

Part B

Variable Trace:   Output:
  x     y         6,10
-----+-----
  3     5
  6    10
  
Part C

Here are the correct source code files:

# --- Source code file: moviereview.py
class MovieReview:
    def __init__(self, the_title, the_director):
        self.title = the_title
        self.director = the_director
        self.comment = ""

        # The rating can be between 0.0 and 5.0, inclusive.
        # A rating of -1 means uninitialized.
        self.rating = -1

    def set_rating(the_rating):
        if 0.0 < = self.rating and self.rating <= 5.0:
            self.rating = the_rating
        else:
            self.rating = -1

    def __str__(self):
        return '''Title: {0:s}
Director: {1:s}
Comment: {2:s}
Rating: {4:.1f}'''.format(self.title, self.director, \
        self.comment, self.rating)

# Source code file: test1.rb
# Script to test MovieReview class.
from moviereview imports MovieReview

review = MovieReview("La La Land", "Damien Chazelle")
review.comment = "An effervescent sample of pure entertainment."
review.set_rating(4.5)
print(review)
print(review.title, review.director)
print(review.comment)
print(review.rating)
review.set_rating(6.0)
print(review.rating)

Part D:

Variable trace table
for Television object tv:

  self.brand  |  self.channel  |  self.volume       Output:
--------------+----------------+---------------     Soni 2 0
    "Soni"            2                0            Soni 11
                                                    11 0
                                                    0
                                                    20
                                                    
Part E:  

from television import Television
import unittest
class MyUnitTestClass(unittest.TestCase):

    def test_1(self):
    # To write the unit test, convert the print statements to assert
    # equal statements of this form:
    # self.assertEqual(computed, expected)
    # Leave the other statements as is.

    tv = Television("Soni")
    
    assertEqual(str(tv), "Soni 2 0")
    assertEqual(tv.brand, "Soni")
    assertEqual(tv.channel, 2)
    
    tv.channel = 11
    assertEqual(tv.channel, 11)
    assertEqual(tv.volume, 0)
    
    tv.decrease_volume( )
    assertEqual(tv.volume, 0)
    
    tv.increase_volume( )
    tv.increase_volume( )
    assertEqual(tv.volume, 20)
    
if __name__ == '__main__':
unittest.main( )