Why lambda functions are used in Python - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a lambda function that adds 5 to a number.

Python

add_five = lambda x: x [1] 5
print(add_five(10))  # Output: 15

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

A/

B-

C*

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-' instead of '+' will subtract instead of add.

Using '*' or '/' will multiply or divide, not add.

The lambda function adds 5 to the input number using the + operator.

2fill in blank

medium

Complete the code to use a lambda function with the map() function to square each number in the list.

Python

numbers = [1, 2, 3, 4]
squared = list(map(lambda x: x [1] x, numbers))
print(squared)  # Output: [1, 4, 9, 16]

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

A*

B-

C+

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using '+' will add the number to itself, not square it.

Using '-' or '/' will not produce the square.

The lambda function multiplies the number by itself to get the square.

3fill in blank

hard

Fix the error in the lambda function that filters even numbers using filter().

Python

numbers = [1, 2, 3, 4, 5, 6]
even_numbers = list(filter(lambda x: x [1] 2 == 0, numbers))
print(even_numbers)  # Output: [2, 4, 6]

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

A//

B%

C**

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using '//' performs floor division, not remainder.

Using '**' is exponentiation, not related to even check.

Using '+' adds numbers, not checks evenness.

The modulo operator '%' returns the remainder. Even numbers have remainder 0 when divided by 2.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps words to their lengths only if length is greater than 3.

Python

words = ['apple', 'bat', 'car', 'door']
lengths = {word: [1] for word in words if len(word) [2] 3}
print(lengths)  # Output: {'apple': 5, 'door': 4}

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Alen(word)

B<=

C>

Dword

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<=' will include words with length 3 or less.

Using 'word' instead of len(word) will map words to themselves.

The dictionary comprehension uses len(word) to get length and filters words with length greater than 3.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps uppercase words to their lengths only if length is less than 5.

Python

words = ['tree', 'sun', 'flower', 'sky']
result = { [1]: [2] for w in words if len(w) [3] 5 }
print(result)  # Output: {'TREE': 4, 'SUN': 3, 'SKY': 3}

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

Aw.upper()

Blen(w)

C<

Dw

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'w' instead of w.upper() will keep words lowercase.

Using '>=' or '>' will filter wrong words.

Using 'w' instead of len(w) will map words to themselves.

The comprehension maps uppercase words to their lengths, filtering words shorter than 5 characters.