Python Set Exercise with Solutions

A set in Python is an unordered collection of unique items. This Python set exercise aims to help you learn and practice set operations.

This Python set exercise contains 16 coding questions, each with a provided solution.

• Practice and solve various set operations, manipulations, and set functions.
• All questions are tested on Python 3.
• Use Online Code Editor to solve exercise questions.
• Read the complete guide on Python Sets to solve this exercise.

As you complete each question, you will become more familiar with the Python set. Please let us know if you have any alternative solutions; they will help other developers.

Exercise 1: Perform Basic Set Operations

1. Create a Set: Create a set named fruits containing “apple”, “banana”, “mango”, and “orange”.
2. Add Element: Add “grape” to the fruits set.
3. Remove Element: Remove “banana” from the fruits set.
4. Discard Element: Try to discard “mango” from the fruits set.

Expected Output:

1. After creating the set: {'apple', 'orange', 'mango', 'banana'}
2. After adding 'grape': {'orange', 'banana', 'grape', 'apple', 'mango'}
3. After removing 'banana': {'orange', 'grape', 'apple', 'mango'}
4. After discarding 'mango': {'orange', 'grape', 'apple'}

# 1. Create a Set
fruits = {"apple", "banana", "mango", "orange"}
print("1. After creating the set:", fruits)

# 2. Add Element
fruits.add("grape")
print("2. After adding 'grape':", fruits)

# 3. Remove Element
fruits.remove("banana")
print("3. After removing 'banana':", fruits)

# 4. Discard Element
fruits.discard("mango")
print("4. After discarding 'mango':", fruits)Code language: Python (python)

Exercise 2: Union of Sets

Find the union of set1 and set2. Write a Python program to return a new set with unique items from both sets by removing duplicates.

Given:

set1 = {10, 20, 30, 40, 50}
set2 = {30, 40, 50, 60, 70}Code language: Python (python)

Expected Output:

{70, 40, 10, 50, 20, 60, 30}

set1 = {10, 20, 30, 40, 50}
set2 = {30, 40, 50, 60, 70}
union_set = set1.union(set2)
print("Union of set1 and set2:", union_set)Code language: Python (python)

Exercise 3: Intersection of Sets

Find the intersection of set1 and set2. Write a code to return a new set containing only the elements that are common to both set1 and set2

Given:

set1 = {10, 20, 30, 40, 50}
set2 = {30, 40, 50, 60, 70}Code language: Python (python)

Expected Output:

{40, 50, 30}

set1 = {10, 20, 30, 40, 50}
set2 = {30, 40, 50, 60, 70}
intersection_set = set1.intersection(set2)
print("Intersection of set1 and set2:", intersection_set)Code language: Python (python)

Exercise 4: Difference of Sets

Find the difference (set1 - set2). Write a code to returns a new set containing elements that are present in set1 but not in set2.

Given:

set1 = {10, 20, 30, 40, 50}
set2 = {30, 40, 50, 60, 70}Code language: Python (python)

Expected Output:

{10, 20}

set1 = {10, 20, 30, 40, 50}
set2 = {30, 40, 50, 60, 70}
difference_set = set1.difference(set2)
print("3. Difference (set1 - set2):", difference_set)Code language: Python (python)

Exercise 5: Symmetric Difference

Find the symmetric difference of set1 and set2. Write a code to returns a new set containing elements that are unique to either set1 or set2, but not in both. It’s like finding the union and then removing the intersection.

Given:

set1 = {10, 20, 30, 40, 50}
set2 = {30, 40, 50, 60, 70}Code language: Python (python)

Expected Output:

{20, 70, 10, 60}

set1 = {10, 20, 30, 40, 50}
set2 = {30, 40, 50, 60, 70}
symmetric_difference_set = set1.symmetric_difference(set2)
print("Symmetric Difference:", symmetric_difference_set)Code language: Python (python)

Exercise 6: Add a list of Elements to a Set

Given a Python list, write a program to add all of its elements into a given set.

Given:

sample_set = {"Yellow", "Orange", "Black"}
sample_list = ["Blue", "Green", "Red"]Code language: Python (python)

Expected output:

Note: Set is unordered.

{'Green', 'Yellow', 'Black', 'Orange', 'Red', 'Blue'}

sample_set = {"Yellow", "Orange", "Black"}
sample_list = ["Blue", "Green", "Red"]

sample_set.update(sample_list)
print(sample_set)Code language: Python (python)

Exercise 7: Set Difference Update

Given two Python sets, write a program to update the first set with only the items that are unique to it (i.e., not present in the second set).

Given:

set1 = {10, 20, 30}
set2 = {20, 40, 50}Code language: Python (python)

Expected output:

set1 {10, 30}

set1 = {10, 20, 30}
set2 = {20, 40, 50}

set1.difference_update(set2)
print(set1)Code language: Python (python)

Exercise 8: Remove Items From Set Simultaneously

Write a Python program to remove items 10, 20, 30 from the following set at once.

Given:

set1 = {10, 20, 30, 40, 50}Code language: Python (python)

Expected output:

{40, 50}

set1 = {10, 20, 30, 40, 50}
set1.difference_update({10, 20, 30})
print(set1)Code language: Python (python)

Exercise 9: Check Subset

Check if set1 is a subset of set2. Write a code to return True if every element in the subset_set is also present in the main_set.

Given:

subset_set = {10, 20}
main_set = {10, 20, 30, 40}Code language: Python (python)

Expected Output:

True

# 1. Check Subset
subset_set = {10, 20}
main_set = {10, 20, 30, 40}

is_subset = subset_set.issubset(main_set)
print(f"Is {subset_set} a subset of {main_set}? {is_subset}")Code language: Python (python)

Exercise 10: Check Superset

Check if main_set = {10, 20, 30, 40} is a superset of subset_set = {10, 20}.

Given:

set1 = {10, 20}
set2 = {10, 20, 30, 40}Code language: Python (python)

Expected Output:

True

subset_set = {10, 20}
main_set = {10, 20, 30, 40}
is_superset = main_set.issuperset(subset_set)
print(f"Is {main_set} a superset of {subset_set}? {is_superset}")Code language: Python (python)

Exercise 11: Set Intersection Check

Write a code to check if two sets have any elements in common. If yes, display the common elements

Given:

set1 = {10, 20, 30, 40, 50}
set2 = {60, 70, 80, 90, 10}Code language: Python (python)

Expected output:

Two sets have items in common
{10}

set1 = {10, 20, 30, 40, 50}
set2 = {60, 70, 80, 90, 10}

if set1.isdisjoint(set2):
  print("Two sets have no items in common")
else:
  print("Two sets have items in common")
  print(set1.intersection(set2))Code language: Python (python)

Exercise 12: Set Symmetric Difference Update

Write a program to update set1 by adding items from set2 that are not common to both sets.

Given:

set1 = {10, 20, 30, 40, 50}
set2 = {30, 40, 50, 60, 70}Code language: Python (python)

Expected output:

{70, 10, 20, 60}

set1 = {10, 20, 30, 40, 50}
set2 = {30, 40, 50, 60, 70}

set1.symmetric_difference_update(set2)
print(set1)Code language: Python (python)

Exercise 13: Set Intersection Update

Write a code to remove items from set1 that are not present in set2.

Given:

set1 = {10, 20, 30, 40, 50}
set2 = {30, 40, 50, 60, 70}Code language: Python (python)

Expected output:

{40, 50, 30}

set1 = {10, 20, 30, 40, 50}
set2 = {30, 40, 50, 60, 70}

set1.intersection_update(set2)
print(set1)Code language: Python (python)

Exercise 14: Find Common Elements in Two Lists

list1 = [10, 20, 30, 40] and list2 = [30, 40, 50, 60], find the common elements using sets.

Given:

list1 = [10, 20, 30, 40]
list2 = [30, 40, 50, 60]Code language: Python (python)

Expected Output:

{40, 30}

list1 = [10, 20, 30, 40]
list2 = [30, 40, 50, 60]

set_list1 = set(list1)
set_list2 = set(list2)

common_elements = set_list1.intersection(set_list2)
print(f"List 1: {list1}")
print(f"List 2: {list2}")
print(f"Common elements using sets: {common_elements}")Code language: Python (python)

Exercise 15: Frozen Set

Create a frozen set from a list.

Given:

my_list = [10, 20, 30]Code language: Python (python)

Expected Output:

({10, 20, 30})

my_list = [10, 20, 30]
frozen_set = frozenset(my_list)
print(f"Original list: {my_list}")
print(f"Created frozen set: {frozen_set}")Code language: Python (python)

Exercise 16: Count Unique Words

Write a code to count the number of unique words in the given a sentence.

Given:

sentence = "dog is a simple animal dogs is selfless animal"Code language: Python (python)

Expected Output:

Number of unique words: 7

sentence = "dog is a simple animal dogs is selfless animal"

# Convert the sentence to lowercase and split it into words
words = sentence.lower().split()

# Convert the list of words to a set to get unique words
unique_words = set(words)

# Count the number of unique words
unique_word_count = len(unique_words)

print(f"Original sentence: '{sentence}'")
print(f"Number of unique words: {unique_word_count}")Code language: Python (python)