Subset and superset checks in Python - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does it mean if set A is a subset of set B?

Set A is a subset of set B if every element in A is also in B.

beginner

How do you check if set A is a superset of set B in Python?

Use the method A.issuperset(B) or the operator A >= B.

intermediate

What is the difference between issubset() and issuperset()?

issubset() checks if all elements of one set are in another set (smaller or equal), while issuperset() checks if one set contains all elements of another set (larger or equal).

beginner

What will {1, 2} <= {1, 2, 3} return in Python?

It returns True because {1, 2} is a subset of {1, 2, 3}.

beginner

Can a set be a subset and superset of itself?

Yes, a set is always a subset and superset of itself because all elements match exactly.

Which Python operator checks if set A is a subset of set B?

A <=

B >=

C ==

D !=

The operator <= checks if all elements of A are in B, meaning A is a subset of B.

What does A.issuperset(B) return if A contains all elements of B?

A False

B Error

C True

D None

issuperset returns True if A contains every element of B.

If A = {1, 2, 3} and B = {2, 3}, which is true?

A A is a superset of B

B B is a superset of A

C A is a subset of B

D B equals A

A contains all elements of B, so A is a superset of B.

What will {1, 2, 3} >= {1, 2, 3} return?

A False

B True

C Depends on Python version

D Error

A set is always a superset of itself, so it returns True.

Which method checks if a set is a subset of another?

A add()

B issuperset()

C contains()

D issubset()

issubset() checks if all elements of one set are in another.

Explain how to check if one set is a subset or superset of another in Python.

Think about methods and operators that compare sets.

Describe a real-life example where subset and superset checks might be useful.

Imagine comparing guest lists or permissions.