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issubset() in python
  • Last Updated : 06 Feb, 2018

The 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 not present.

Syntax:

A.issubset(B)
checks whether A is a subset of B or not.
Returns:
returns true if A is a subset of B otherwise false.

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# Python program to demonstrate working of
# issubset().
  
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))

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Output:

True
False
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# 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))

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Output:

True
False
False
True

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