Why list comprehension is used in Python - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a list of squares from 1 to 5 using list comprehension.

Python

squares = [x[1]2 for x in range(1, 6)]
print(squares)

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

A**

B-

C+

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using * instead of ** will multiply x by 2, not square it.

The ** operator is used to raise a number to a power. Here, x**2 means x squared.

2fill in blank

medium

Complete the code to create a list of even numbers from 0 to 10 using list comprehension.

Python

evens = [x for x in range(11) if x [1] 2 == 0]
print(evens)

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A%

B!=

C//

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using // instead of % will do floor division, not remainder.

The % operator gives the remainder. If x % 2 == 0, x is even.

3fill in blank

hard

Fix the error in the list comprehension to create a list of uppercase words.

Python

words = ['apple', 'banana', 'cherry']
upper_words = [word[1] for word in words]
print(upper_words)

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A.capitalize()

B.lower()

C.upper()

D.title()

Attempts:

3 left

💡 Hint

Common Mistakes

Using .lower() will make all letters lowercase, not uppercase.

The .upper() method converts a string to uppercase letters.

4fill in blank

hard

Fill both blanks to create a list of squares for numbers greater than 3.

Python

result = [x[1]2 for x in range(1, 7) if x [2] 3]
print(result)

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

A**

B>

C<

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using * instead of ** will multiply by 2, not square.

Using < instead of > will select numbers less than 3.

Use ** to square numbers and > to filter numbers greater than 3.

5fill in blank

hard

Fill all three blanks to create a dictionary of word lengths for words longer than 4 letters.

Python

word_lengths = [1]: [1] for [2] in words if len([3]) > 4}

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

Aword

Blen(word)

Cwords

Dw

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names for keys and loop variable causes errors.

Using 'words' as loop variable is incorrect; it is the list.

The dictionary keys are words (word), values are their lengths (len(word)), and the loop variable is word.