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Python Set Methods

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Python Set Methods

A set is a collection which is unordered and unindexed. Python has a set of built-in methods that you can use on sets.

Methods Description
add() The set.add() method adds the specified element to the set
clear() The set.add() method in Python removes all the elements from the set.
copy() This method returns a Shallow Copy for the Set
difference() The set.difference() method in Python returns a set containing the difference between two or more sets
difference_update() The difference_update() method in Python removes the common elements from the original set that are also included in another, given set.
discard() The set.discard() method in Python removes the specified  element from the Set.
intersection() The set.intersection() method in Python returns a set  that contains the intersection or the common elements between or among the given sets.
intersection_update() This method removes the elements in this set that are not present in other given set(s).
isdisjoint() The set.disjoint() method in Python checks whether the specified sets are disjoint(whether two sets have a intersection) or not.
issubset() This method returns a boolean value true is another set that contains this set.
issuperset() The set.issuperset() method in Python Returns whether this set contains another set or not
pop() The set.pop() method removes an arbitrary element from the set.
remove() The set.remove() method in python removes the specified item from the set.
symmetric_difference() This method returns a set with the symmetric differences of two sets
symmetric_difference_update() This method Updates the original Set With Symmetric Difference of the given two sets.
union() The union() method return a set containing the union of the set(s).
update() The set.update() method in Python updates the set with the union of this set and others

Example 1

# Python program explaining
# the set methods 
# initializing the set A
A = {"a", "e", "z","g"}
print("Set A: ",A)
# the set.add() method
# adding the more element in the set A
A.add("l") 
A.add("r") 
# After adding the more fruits in the set
print("After adding few more elements...")
print("New set A: ",A)
# the set.copy() method
print("Copied set B:",B)
print("Actual set A:",A)
#adding emenets in set B
B.add("g")
B.add("j")
# the set.difference() method 
# Returns a set containing the difference between Set A and SEt B
print("\nAfter subtracting Set A from Set B... ")
print("Differnce Set : ",A.difference(B))
print("Set A:",A) 
print("Set B:",B)
# the clear.set() method
# removing all the elements from Set A an Set B
A.clear()
B.clear() 
print("\nAfter clearing all the elements...")
print("Set A",A)
print("Set B",B) 

Output

Set A:  {'e', 'a', 'g', 'z'}
After adding few more elements...
New set A:  {'z', 'a', 'l', 'e', 'r', 'g'}
After the copying the dictionary... 
Copied set B: {'e', 'r', 'z', 'g', 'a', 'l'}
Actual set A: {'z', 'a', 'l', 'e', 'r', 'g'}
After subtracting Set A from Set B...  
Differnce Set :  set()
Set A: {'z', 'a', 'l', 'e', 'r', 'g'}
Set B: {'e', 'r', 'z', 'g', 'a', 'j', 'l'} 
After clearing all the elements...
Set A: set()
Set B: set() 

Example 2

# Python program explaining
# the set methods 
#initializing a set with numbers from 1 to 10
set1 = {1,2,3,4,5,6,7,8,9,10} 
print("Actual set 1:",set1)
 # initializing set2 with even numbers
set2 = {2,4,6,8,10} 
print("Actual set2: ",set2)
# the set.difference_update() method
# Removeing the items in set1 that are also included in set2
print("After subtracting set1 from set2... ") 
set1.difference_update(set2)
print("New Set 1: ",set1)
print("New Set 2:",set2) 
# the set.discard() method
# removing 3  and 5 from set1 and set2
set1.discard(3)
set2.discard(5)
# prinitg the set 
print('\nAfter discarding 3 and 5 from set1 and set2...')
print("New set1:",set1)
print("New set2:",set2)
# the set.intersection() method
# returning the common elements between set1 and set2 
print("\nIntersection between set1 and set2...")
print("set1 U set2 :",set1.intersection(set2))
# the set.union() method
# returns a new set with different items from all the sets and 
#writing the common elements between both the sets only once 
print("\nThe union of set1 and set2...")
Union= set1.union(set2)
print("A U B: ",Union) 

Output

Actual set 1: {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
Actual set2:  {8, 10, 2, 4, 6}
After subtracting set1 from set2... 
New Set 1:  {1, 3, 5, 7, 9} 
New Set 2: {8, 10, 2, 4, 6}
After discarding 3 and 5 from set1 and set2...
New set1: {1, 5, 7, 9} 
New set2: {8, 10, 2, 4, 6}
Intersection between set1 and set2...
set1 U set2 : set() 
The union of set1 and set2...
A U B:  {1, 2, 4, 5, 6, 7, 8, 9, 10} 

Example 3

# Python program explaining
# the set methods 
#initializing set1
set1 = {"a", "e", "i", "o","u"}
print("Set 1:",set1) 
# initializing set2
set2 = {"u", "f","a","w"} 
print("Set 2:",set2)
# the set.issuperset() method 
# will check whether set1 is a superset for set2
a= set1.issuperset(set2)
if a == True:
    { 
print("\nset1 is a superset for set2")}
elif a == False:
     {
print("\nset1 is not a superset for set2")} 
    {
print("\nset1 is a subset for set2")} 
elif a == False:
     {
print("\nset1 is not a subset for set2")} 

Output

Set 1: {'i', 'e', 'a', 'u', 'o'}
Set 2: {'a', 'w', 'u', 'f'}
set1 is not a superset for set2
set1 is not a subset for set2 
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