Why while loop is needed in Python - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print numbers from 1 to 5 using a while loop.

Python

count = 1
while [1]:
    print(count)
    count += 1

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

Acount < 1

Bcount = 5

Ccount <= 5

Dcount > 5

Attempts:

3 left

💡 Hint

Common Mistakes

Using assignment '=' instead of comparison '<=' in the condition.

The condition count <= 5 keeps the loop running until count reaches 5.

2fill in blank

medium

Complete the code to keep asking the user for input until they type 'exit'.

Python

user_input = ''
while [1]:
    user_input = input('Type something (or exit): ')
print('Goodbye!')

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

Auser_input > 'exit'

Buser_input != 'exit'

Cuser_input = 'exit'

Duser_input == 'exit'

Attempts:

3 left

💡 Hint

Common Mistakes

Using assignment '=' instead of comparison '!=' in the condition.

The loop continues while the input is not 'exit'. When the user types 'exit', the loop stops.

3fill in blank

hard

Fix the error in the code to avoid an infinite loop that prints numbers from 1 to 3.

Python

num = 1
while num <= 3:
    print(num)
    [1]

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

Anum += 1

Bnum -= 1

Cnum = num

Dnum = 3

Attempts:

3 left

💡 Hint

Common Mistakes

Not changing the loop variable, causing an infinite loop.

Incrementing num by 1 ensures the loop will eventually stop when num becomes greater than 3.

4fill in blank

hard

Fill both blanks to create a dictionary of squares for numbers 1 to 5 using a while loop.

Python

squares = {}
i = 1
while [1]:
    squares[i] = i[2]2
    i += 1

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

Ai <= 5

Bi < 5

C**

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' instead of '<=' causing missing the last number.

Using '*' instead of '**' for squaring.

The loop runs while i is less than or equal to 5. The exponent operator ** is used to square i.

5fill in blank

hard

Fill all three blanks to create a dictionary of words and their lengths for words longer than 3 letters.

Python

words = ['apple', 'bat', 'carrot', 'dog']
lengths = { [1]: [2] for word in words if len(word) [3] 3 }

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

Aword

Blen(word)

C>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' instead of '>' causing wrong filtering.

Swapping keys and values.

The dictionary uses the word as the key and its length as the value. The condition filters words longer than 3 letters using '>'.