Python Set issubset() Method

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Python set issubset() method returns True if all elements of a set A are present in another set B which is passed as an argument, and returns False if all elements are not present in Python.

Python Set issubset() Method Syntax:

Syntax: set_obj.issubset(other_set)

Parameter:

other_set: any other set to compare with.

Return: bool

Python set issubset() Method Example:

Python3

s1 = {1, 2, 3, 4, 5} 
s2 = {4, 5} 
# Output True, since, s2 elements in s1 
print(s2.issubset(s1))

Output:

True

Python set issubset() method

Example 1: How Python set issubset() work

Python

A = {4, 1, 3, 5} 
B = {6, 0, 4, 1, 5, 0, 3, 5} 
  
# Returns True 
print(A.issubset(B)) 
  
# Returns False 
# B is not subset of A 
print(B.issubset(A)) 

Output:

True
False

Example 2: Working with three-set using issubset()

Python

# Another Python program to demonstrate working 
# of issubset(). 
A = {1, 2, 3} 
B = {1, 2, 3, 4, 5} 
C = {1, 2, 4, 5} 
  
# Returns True 
print(A.issubset(B)) 
  
# Returns False 
# B is not subset of A 
print(B.issubset(A)) 
  
# Returns False 
print(A.issubset(C)) 
  
# Returns True 
print(C.issubset(B)) 