Why sets are used in Python - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a set with unique numbers.

Python

numbers = [1]([1, 2, 2, 3, 4, 4])
print(numbers)

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Alist

Bset

Cdict

Dtuple

Attempts:

3 left

💡 Hint

Common Mistakes

Using list() keeps duplicates.

Using dict() requires key-value pairs.

Using tuple() keeps duplicates and is immutable.

Using set() removes duplicates and creates a collection of unique items.

2fill in blank

medium

Complete the code to check if 'apple' is in the set.

Python

fruits = {'apple', 'banana', 'cherry'}
if 'apple' [1] fruits:
    print('Found apple!')

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Ain

Bnot in

C==

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '==' compares whole sets, not membership.

Using '!=' is for inequality, not membership.

Using 'not in' checks absence, not presence.

The in keyword checks if an item exists in a set.

3fill in blank

hard

Fix the error in the code to add an item to the set.

Python

colors = {'red', 'green', 'blue'}
colors.[1]('yellow')
print(colors)

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Aappend

Bextend

Cinsert

Dadd

Attempts:

3 left

💡 Hint

Common Mistakes

Using append causes an error because sets don't support it.

Using insert or extend are list methods, not set methods.

Sets use add() to add a single item.

4fill in blank

hard

Complete the code to create a set of unique words longer than 3 letters.

Python

words = ['apple', 'bat', 'car', 'dog', 'apple']
unique_long = {word for word in words if len(word) [1] 3}
print(unique_long)

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B>

C<

Dlen(word)

Attempts:

3 left

💡 Hint

Common Mistakes

Putting 'len(word)' in the first blank causes syntax errors.

Using '<' instead of '>' filters shorter words.

The set comprehension uses word directly and filters words with length greater than 3.

5fill in blank

hard

Fill all three blanks to create a set of uppercase words with length greater than 4.

Python

words = ['apple', 'bat', 'carrot', 'dog', 'banana']
result = [1] for word in words if len(word) [2] 4
result_set = set(result)
print(result_set)

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Aword.upper()

B>

Cif

Dword.lower()

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'word.lower()' instead of 'word.upper()' changes case incorrectly.

Using '<' instead of '>' filters wrong words.

Omitting 'if' causes syntax errors.

The comprehension converts words to uppercase, filters by length greater than 4, and uses 'if' for the condition.