Table of Contents

    Mastering Python Sets: Functions, Operations, and Examples

    Rumman Ansari July 28, 2024 895 views

    What is Set in python?

    A set is an unordered collection of items. Every set element is unique (no duplicates) and must be immutable (cannot be changed). However, a set itself is mutable. We can add or remove items from it. Sets can also be used to perform mathematical set operations like union, intersection, symmetric difference, etc.

    Python’s built-in set type has the following characteristics:

    • Sets are unordered.
    • Set elements are unique. Duplicate elements are not allowed.
    • A set itself may be modified, but the elements contained in the set must be of an immutable type.

    Duplicates Not Allowed

    Sets cannot have two items with the same value. 

    vegetableSet  = {"Tomato", "Potato", "Carrot", "Tomato"}

print(vegetableSet)

    Output: 

    {'Potato', 'Tomato', 'Carrot'}

    Get the Length of a Set

    To determine how many items a set has, use the len() 

    vegetableSet  = {"Tomato", "Potato", "Carrot", "Ginger"}

print(len(vegetableSet))

    Output: 

    4
    Practice Quiz 17 MCQs Smart Learning

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    MCQ Section

    MCQ 1
    What will be the output after the following statements? 
    x = {'A', 'B', 'C'}
y = 'b' in x
print(y)
    MCQ 2
    What is the output of the following 
    set1 = {10, 20, 30, 40, 50}
set2 = {60, 70, 10, 30, 40, 80, 20, 50}

print(set1.issubset(set2))
print(set2.issuperset(set1))
    MCQ 3
    What is the output of the following code 
    aSet = {1, 'PYnative', ('abc', 'xyz'), True}
print(aSet)
    MCQ 4
    What is the output of the following set operation 
    set1 = {"Yellow", "Orange", "Black"}
set2 = {"Orange", "Blue", "Pink"}

set3 = set2.difference(set1)
print(set3)
    MCQ 5
    Select all the correct options to remove
    MCQ 6
    The isdisjoint() method returns True if none of the items are present in both sets, otherwise, it returns False.
    MCQ 7
    What is the output of the following 
    sampleSet = {"Yellow", "Orange", "Black"}
sampleSet.add("Blue")
sampleSet.add("Orange")
print(sampleSet)
    MCQ 8
    What is the output of the following 
    sampleSet = {"Yellow", "Orange", "Black"}
sampleSet.discard("Blue")
print(sampleSet)
    MCQ 9
    What is the output of the following set operation 
    sampleSet = {"Yellow", "Orange", "Black"}
sampleSet.update(["Blue", "Green", "Red"])
print(sampleSet)
    MCQ 10
    Select all which is true for Python set
    MCQ 11
    The union() method returns a new set with all items from both sets by removing duplicates
    MCQ 12
    What is the output of the following code 
    aSet = {1, 'PYnative', ['abc', 'xyz'], True}
print(aSet)
    MCQ 13
    Select all the correct ways to copy two sets
    MCQ 14
    The symmetric_difference() method returns a set that contains all items from both sets, but not the items that are present in both sets.
    MCQ 15
    What is the output of the following code 
    sampleSet = {"Yellow", "Orange", "Black"}
print(sampleSet[1])
    MCQ 16
    What is the output of the following set operation. 
    set1 = {"Yellow", "Orange", "Black"}
set2 = {"Orange", "Blue", "Pink"}

set1.difference_update(set2)
print(set1)
    MCQ 17
    What is the output of the following union operation 
    set1 = {10, 20, 30, 40}
set2 = {50, 20, "10", 60}

set3 = set1.union(set2)
print(set3)