Python Set Exercise and Solutions

Question 1 : Fetch the similar items from two sets.

Given Sets:

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

Expected Output:

{50, 20, 30}

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For this, we will use the intersection() method.

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

new_set = set1.intersection(set2)

print(new_set)

Output:

{50, 20, 30}

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Question 2 : Fetch the Unique items from two sets.

Given Sets:

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

Expected Output:

{10, 20, 30}

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For this, we will use the union() method.

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

new_set = set1.union(set2)

print(new_set)

Output:

{10, 20, 30}

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Question 3 : Update the set1 with the items that are unique to set1 only (means that do not exist in set2).

Given Sets:

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

Expected Output:

{40, 10}

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For this, we will use the union() method.

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

set1.difference_update(set2)

print(set1)

Output:

{40, 10}

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Question 4 : Fetch the uncommon elements from set1 and set2.

Given Sets:

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

Expected Output:

{10, 50}

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For this, we will use the symmetric_difference_update() method.

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

set1.symmetric_difference_update(set2)

print(set1)

Output:

{10, 50}

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Question 5 : How to check if there are any common elements in two sets. If yes, print them.

Given Sets:

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

Expected Output:

Here is the list of common elements:
{40, 20, 30}

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For this, we will use the isdisjoint() method and intersection() method.

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

if set1.isdisjoint(set2):
    print("Nothing in Common")
else:
    print("Here is the list of common elements:")
    print(set1.intersection(set2))

Output:

Here is the list of common elements:
{40, 20, 30}

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Question 6 : From the given set of names, separate the names that start with j and t and create two new sets.

Given Set:

names = {"Jack", "John", "Tim", "Thomas", "Jim", "Tom" }

Expected Output:

{'Jim', 'John', 'Jack'}
{'Tim', 'Thomas', 'Tom'

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Solution:

names = {"Jack", "John", "Tim", "Thomas", "Jim", "Tom" }

j_names = set()
t_names = set()
for n in names:
    if n.startswith("J"):
        j_names.add(n)
    if n.startswith("T"):
        t_names.add(n)

print(j_names)
print(t_names)

Output:

{'Jim', 'John', 'Jack'}
{'Tim', 'Thomas', 'Tom'}

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Question 7 : In Python, which operator is used to determine that if a set is the subset of another set?

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Approach 1 : Using the issubset() method:

s1 = {1,2,3,4,5,6,7,8,9}
s2 = {1,2,3,4}

print(s2.issubset(s1)) #s2 is subset of s1
print(s1.issubset(s2)) #s1 is subset of s2

Approach 2 : Using the < operator:

s1 = {1,2,3,4,5,6,7,8,9}
s2 = {1,2,3,4}

print(s2 < s1) #s2 is subset of s1
print(s1 < s2) #s1 is subset of s2

Output:

True
False

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Question 8 : Create an empty “names” set and then add 4 names, rename 1 of them and then remove 2 names from the set.

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Solution:

my_set  = set()
my_set.add("Steve")
my_set.add("Jeff")
my_set.add("Jack")
my_set.add("Elon")
print("Four elements are :", my_set)
my_set.remove("Steve")
my_set.add("Tim")
print("Elements after modifying one are :", my_set)
my_set.remove("Jeff")
my_set.remove("Elon")
print("Elements after removing two :", my_set)

Output:

Four elements are : {'Jeff', 'Jack', 'Elon', 'Steve'}
Elements after modifying one are : {'Jeff', 'Jack', 'Elon', 'Tim'}
Elements after removing two : {'Jack', 'Tim'}

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Question 9 : Create a set of 10 random integers between 10 and 40. Now print the count of numbers less than 20 and remove numbers > 30 from the set.

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Solution:

import random

count  = 0
s = set()
temp_set = set()

while len(s) < 10:
    s.add(random.randint(10,40))

print("Original Set =", s)

for i in s:
    if i < 20:
        count = count + 1
    if i <= 30:
        temp_set.add(i)

s = temp_set
print("Items less than 20 =", count)

print("Set after deleting items =", s)

Output:

Original Set = {32, 36, 38, 39, 40, 11, 16, 27, 28, 30}
Items less than 20 = 2
Set after deleting items = {11, 16, 27, 28, 30}

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