Determines whether all items in the set are present in the specified set

## Usage

The `issubset()` method returns True if all items in the set are present in the specified set, otherwise FALSE.

In set theory, every set is a subset of itself.

For example, `A.issubset(A)` is True.

## Syntax

set.issubset(set)

 Parameter Condition Description set Required A set to search for common items in

## Basic Example

``````# Check if all items in A are present in B
A = {'yellow', 'red'}
B = {'red', 'green', 'blue', 'yellow'}
print(A.issubset(B))
# Prints True``````

## Equivalent Operator <=

You can achieve the same result by using the `<=` comparison operator.

``````A = {'yellow', 'red'}
B = {'red', 'green', 'blue', 'yellow'}
print(A <= B)
# Prints True``````

## Find Proper Subset

To test whether the set is a proper subset of other, use `<` comparison operator.

Set A is considered a proper subset of B, if A is a subset of B, but A is not equal to B.

``````# Check if A is a proper subset of B
A = {'yellow', 'red'}
B = {'red', 'green', 'blue', 'yellow'}
print(A < B)
# Prints True

# Check if A is a proper subset of B
A = {'yellow', 'red'}
B = {'yellow', 'red'}
print(A < B)
# Prints False``````