List comprehension vs loop in Python - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a list of squares using a loop.

Python

squares = []
for i in range(5):
    squares.append(i[1]2)
print(squares)

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

A-

B*

C+

D**

Attempts:

3 left

💡 Hint

Common Mistakes

Using multiplication (*) instead of exponentiation (**).

Using addition (+) or subtraction (-) by mistake.

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

2fill in blank

medium

Complete the list comprehension to create a list of squares.

Python

squares = [i[1]2 for i in range(5)]
print(squares)

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

A**

B+

C*

D-

Attempts:

3 left

💡 Hint

Common Mistakes

Using multiplication (*) instead of exponentiation (**).

Using addition (+) or subtraction (-) by mistake.

In list comprehensions, you can use the same operators as in regular code. Here, i**2 squares each number.

3fill in blank

hard

Fix the error in the loop that tries to create a list of even numbers.

Python

evens = []
for num in range(10):
    if num [1] 2 == 0:
        evens.append(num)
print(evens)

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

A//

B+

C%

D**

Attempts:

3 left

💡 Hint

Common Mistakes

Using addition (+) instead of modulo (%).

Using floor division (//) or exponentiation (**) incorrectly.

The modulo operator % gives the remainder of division. num % 2 == 0 checks if num is even.

4fill in blank

hard

Fill both blanks to create a list of even squares using list comprehension.

Python

even_squares = [x[1]2 for x in range(10) if x [2] 2 == 0]
print(even_squares)

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

A**

B%

C==

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using addition (+) or equality (==) in the wrong place.

Mixing up operators for squaring and checking evenness.

The first blank uses ** to square the number. The second blank uses % to check if the number is even.

5fill in blank

hard

Fill all three blanks to create a dictionary of numbers and their squares for odd numbers only.

Python

odd_squares = [1]: [1] for [2] in range(10) if [3] % 2 != 0}
print(odd_squares)

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

Anum

Bnum**2

Di

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names inconsistently.

Not squaring the number for the value.

The dictionary comprehension uses num as the key and num**2 as the value. The variable num iterates over the range.