COMP 163 Practice Final Exam

Part 2: Determine Output (25%)

Review each code block and type exactly what the interpreter would print out.

Question 1 5 points

⚠️ Type out only what the interpreter would print out. No extra quotes or prefixes.

Review the code block and select the choice that shows the correct output.

a = not(True)
b = "dog" != "Dog"
c = a and b
print(c)

true

false

True

False

Question 2 5 points

⚠️ Type out only what the interpreter would print out. No extra quotes or prefixes.

Review the following code. For your answer, type what this prints when run.

message = "debugging"
print(message[2])
print(message[-2])
print(message[0:3])
print(message[::2])

Question 3 3 points

⚠️ Type out only what the interpreter would print out.

Review the following code. For your answer, type what this prints when run.

inventory = {
    "pens": "x101",
    "paper": "x202",
    "folders": "x303"
}
inventory["paper"] = "x999"
del inventory["pens"]
print(inventory["paper"])

Question 4 5 points

⚠️ You intentionally cannot run this code

Given the file pet_registry.txt with contents:

📄 pet_registry.txt
golden retriever owned by Smith family on Oak St
tabby cat owned by Jones family on Elm Ave
golden retriever owned by Brown family on Pine Rd
persian cat owned by Smith family on Oak St
golden retriever owned by Davis family on Maple Dr

Review the following code.

def count_pet_type(filename, pet_type):
    with open(filename, "r") as f:
        records = f.readlines()
    pet_count = 0
    for record in records:
        if pet_type.lower() in record:
            pet_count += 1
    return pet_count
print(count_pet_type("pet_registry.txt", "golden retriever"))

What does this code print when it is run?

Question 5 7 points

⚠️ Type out only what the interpreter would print out.

Review the following code. For your answer, type what this prints when run.

threshold = 75
test_results = {
    "Alice": [80, 72, 90],
    "Bob": [65, 75, 70],
    "Carol": [88, 92, 75]
}
for student in test_results:
    for score in test_results[student]:
        if score >= threshold:
            print(f"{score} - {student}")

Part 3: Debug Code (20%)

Fix the bugs in each code block. Press Run to test your code.

Part 3.1: Debug Code 10 points

ℹ️ Note: To debug code, you may need to add, remove, or rewrite code.

The function count_vowels is intended to count the total number of vowels (a, e, i, o, u) in a given string. It should iterate through each character in the string and increment a counter when a vowel is found. The function should return the total count.

# Students: Fix the bugs in this code
# ================================================
def count_vowels(text)
    vowels = ["a", "e", "i", "o", "u"]
    count == 0

    for char in text:
        if char in vowels
            count += 1

    return counts

if __name__ == "__main__":
    message = "Hello World"
    result = count_vowels[message]
    print(f"Number of vowels: {result}")

Output

Part 3.2: Debug Code 10 points

ℹ️ Note: To debug code, you may need to add, remove, or rewrite code.

Read a file named temperatures.txt (which contains one temperature per line, possibly including empty lines or non-numeric lines like "N/A") and safely calculate the average of all valid float temperatures. If a value is blank, it should be skipped. If the value cannot be parsed into a float, use a default value of 72.0. The given file should result in an average of 74.0.

📄 temperatures.txt
68.5
75.0

82.5
N/A
70.0

# Students: Fix the bugs in this code
# ================================================
total = 0
count = 0
f = with open('temperatures.txt', 'r'):
    for line in f.read()
        cleaned_line = line.swapcase()
        if not cleaned_line:
            # skip blank lines
            break
        try:
            total += float(cleaned_line)
        catch:
            total += 72.0
        count += 1
average = total / count
print(average)

Output

Part 4: Modify Code (20%)

Modify the code to meet the new requirements.

Part 4.1: Modify Code 10 points

ℹ️ Note: To modify code, you may need to add, remove, or rewrite code.

The original purpose of the following code was to remove the first task from a to-do list, print a message that it was completed, and return the updated list.

However, there is a bug: when the list is empty, an exception occurs.

Modify the complete_task function so:

If the list is not empty, remove the first item, print that it was completed, and return True.
If the list is empty, print "No tasks remaining." and return False.

# Students: Modify this code
# ================================================
def complete_task(task_list):
    finished = task_list.pop(0)
    print(f"{finished} completed")
    return task_list

if __name__ == "__main__":
    # DO NOT ALTER THE MAIN IN ANY WAY!
    my_tasks = ["Send email", "Review report", "Call client"]

    while complete_task(my_tasks):
        print(f"{len(my_tasks)} tasks remaining")

    print("=== All tasks done ===" )
    complete_task(my_tasks)  # Should print the "no tasks" message

Output

Part 4.2: Modify Code 10 points

ℹ️ Note: To modify code, you may need to add, remove, or rewrite code.

The following program was originally written to double a number that the user inputs. Modify the program so:

The logic is moved into a function run_doubler()
It continues to prompt the user until the user enters "quit"
run_doubler() should return the number of times the user doubled a number
The main calls run_doubler() and prints what was returned

Example output for inputs "5" then "quit":

Enter a number to double (or type quit): 5
10
Enter a number to double (or type quit): quit
Thanks for using the doubler!
== Doubled 1 numbers. ==

# Students: Modify this code
# ================================================
num = input("Enter a number to double (or type quit): ")
if num != "quit":
    print(int(num) * 2)
print ("Thanks for using the doubler!")

Output

Part 5: Parson's Problems (10%)

Drag the code blocks to the solution area and arrange them in the correct order.

Parson's Problem 1 5 points

Once rearranged, the function should print a "Rolling the dice..." message, pause for between 1 and 2 seconds (inclusive) and print the result of rolling two dice (each 1-6) added together.

ℹ️ You will not use 3 of the blocks in your program (they are distractors).

📦 Drag from here

if __name__ == "__main__": roll_dice()

die1 = randint(1,6) die2 = randint(1,6)

import random import math def roll_dice():

die1 = random.randint(1,6) die2 = random.randint(1,6)

delay = randint(1,2) sleep(delay)

print("Rolling the dice...")

delay = random.randint(1,2) time.sleep(delay)

import random import time def roll_dice():

print(f"You rolled {die1 + die2}!")

✅ Drop blocks here

Parson's Problem 2 5 points

Once rearranged, the code should prompt a user to first input a movie genre and then a rating (G, PG, PG-13, R).

If both genre and rating are in their respective valid lists, print a message about searching for movies.
If neither genre nor rating is valid, print a message that neither are recognized.
Otherwise, print that one of the inputs is not recognized.

ℹ️ You will use all of the blocks in your program.

📦 Drag from here

print(f"Neither {genre} nor {rating} are recognized.")

rating = input("What rating? ")

if genre in valid_genres and rating in valid_ratings:

valid_genres = ["Action", "Comedy", "Drama", "Horror"] valid_ratings = ["G", "PG", "PG-13", "R"] genre = input("What genre? ")

🔒 Access Required

🎓 COMP 163 Practice Final Exam

Part 1: Explain Code (20%)

Part 2: Determine Output (25%)

Part 3: Debug Code (20%)

Part 4: Modify Code (20%)

Part 5: Parson's Problems (10%)

Part 6: Evaluate GenAI Output (5%)