Infinite loop prevention in Python - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to prevent an infinite loop by updating the loop variable.

Python

count = 0
while count < 5:
    print(count)
    count [1] 1

Drag options to blanks, or click blank then click option'

A+=

B-=

C*=

D/=

Attempts:

3 left

💡 Hint

Common Mistakes

Using -= causes the count to decrease, leading to an infinite loop.

Using *= or /= changes the count unpredictably and may not stop the loop.

Using count += 1 increases the count each time, so the loop will eventually stop.

2fill in blank

medium

Complete the code to stop the loop when the user types 'exit'.

Python

while True:
    command = input('Enter command: ')
    if command [1] 'exit':
        break

Drag options to blanks, or click blank then click option'

A!=

B==

C<

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using != causes the loop to break on any input except 'exit'.

Using < or > does not correctly compare strings for equality.

The loop breaks when the command is exactly 'exit', so we check if command == 'exit'.

3fill in blank

hard

Fix the error in the loop condition to prevent an infinite loop.

Python

i = 10
while i > 0:
    print(i)
    i [1] 1

Drag options to blanks, or click blank then click option'

A-=

B+=

C*=

D/=

Attempts:

3 left

💡 Hint

Common Mistakes

Increasing i causes the loop to never end.

Multiplying or dividing i may not reach 0 and cause infinite loops.

Since i starts at 10 and the loop runs while i > 0, we must decrease i with i -= 1 to eventually stop the loop.

4fill in blank

hard

Fill both blanks to create a loop that prints even numbers from 2 to 10.

Python

num = 2
while num [1] 10:
    print(num)
    num [2] 2

Drag options to blanks, or click blank then click option'

A<=

B>=

C+=

D-=

Attempts:

3 left

💡 Hint

Common Mistakes

Using >= in the condition causes the loop to never run.

Using -= decreases the number and causes an infinite loop.

The loop runs while num <= 10 and increases num by 2 each time with num += 2 to print even numbers.

5fill in blank

hard

Fill all three blanks to create a loop that counts down from 5 to 1 and stops.

Python

counter = [1]
while counter [2] 0:
    print(counter)
    counter [3] 1

Drag options to blanks, or click blank then click option'

A5

B>

C-=

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Starting counter at 0 causes the loop to never run.

Using < in the condition causes an infinite loop.

Increasing counter causes the loop to never end.

Start counter at 5, loop while counter > 0, and decrease it by 1 each time with counter -= 1.