Basic dictionary comprehension in Python - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a dictionary with numbers as keys and their squares as values.

Python

squares = {x: 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 add 2 to x, not square it.

Using '*' 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 dictionary with words as keys and their lengths as values.

Python

words = ['apple', 'banana', 'cherry']
lengths = {word: [1] for word in words}
print(lengths)

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

Alen(word)

Bword

Cword.upper()

Dword[0]

Attempts:

3 left

💡 Hint

Common Mistakes

Using the word itself as the value instead of its length.

Using word.upper() returns the uppercase word, not its length.

The len() function returns the length of a string. Here, it gives the length of each word.

3fill in blank

hard

Fix the error in the dictionary comprehension to create a dictionary with numbers as keys and their cubes as values.

Python

cubes = {n: n[1]3 for n in range(1, 5)}
print(cubes)

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

A*

B**

C+

D//

Attempts:

3 left

💡 Hint

Common Mistakes

Using '*' multiplies n by 3 instead of cubing it.

Using '+' adds 3 to n instead of cubing it.

The exponentiation operator ** is needed to cube the number (raise it to the power of 3).

4fill in blank

hard

Complete the code to create a dictionary with words as keys and their first letters as values, but only for words longer than 5 letters.

Python

words = 'apple', 'banana', 'cherry', 'date']
result = {word: word[0 for word in words if len(word) [1] 5}
print(result)

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

A[

B>

C<

D]

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses instead of brackets for indexing.

Using '<' instead of '>' in the condition.

The condition len(word) > 5 filters words longer than 5 letters.

5fill in blank

hard

Fill both blanks to create a dictionary with uppercase words as keys and their lengths as values, but only for words with length less than 6.

Python

words = ['apple', 'banana', 'cherry', 'date']
result = {word.upper(): {BLANK_2}} for word in words if len(word) {{BLANK_2}} 6
print(result)

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

A{word.upper()}

Blen(word)

C<

D{

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting the opening brace for the dictionary comprehension.

Using '>' instead of '<' in the condition.

Using the word itself instead of its length for values.

The dictionary comprehension starts with {. The keys are uppercase words using word.upper() (inside braces), the values are lengths with len(word), and the condition filters words with length less than 6 using <.