List comprehension with if–else in Python - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a list that doubles each number in the range 1 to 5.

Python

result = [x[1]2 for x in range(1, 6)]
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 add 2 instead of doubling.

Using '**' will square the number, not double it.

The * operator multiplies each number by 2, doubling it.

2fill in blank

medium

Complete the code to create a list that labels numbers as 'even' or 'odd' using if–else inside a list comprehension.

Python

labels = ['even' if x[1] 2 == 0 else 'odd' for x in range(1, 6)]
print(labels)

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

A%

B+

C//

D**

Attempts:

3 left

💡 Hint

Common Mistakes

Using '+' or '**' will not check divisibility.

Using '//' gives the quotient, not the remainder.

The '%' operator gives the remainder. If remainder is 0 when divided by 2, the number is even.

3fill in blank

hard

Fix the error in the list comprehension that should replace negative numbers with 0.

Python

numbers = [-3, 5, -1, 7]
result = [x if x [1] 0 else 0 for x in numbers]
print(result)

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

A==

B<

C>

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' will keep negative numbers instead of replacing them.

Using '==' or '!=' will not correctly filter positive numbers.

We keep x if it is greater than 0; otherwise, replace with 0.

4fill in blank

hard

Fill both blanks to create a list that squares even numbers and cubes odd numbers from 1 to 5.

Python

result = [x[1]2 if x [2] 2 == 0 else x**3 for x in range(1, 6)]
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 but not square.

Using '+' instead of '%' will not check evenness.

Use '**' to square numbers and '%' to check if a number is even.

5fill in blank

hard

Fill both blanks to create a list of strings labeling numbers as 'small', 'medium', or 'large' based on their value.

Python

sizes = ['small' if x [1] 3 else 'medium' if x [2] 6 else 'large' for x in range(1, 10)]
print(sizes)

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

A<=

B<

C>

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<=' instead of '<' changes the boundary conditions.

Using '>' or '>=' instead of '<' will misclassify numbers.

Use '<' to check if x is less than 3 or 6.