Subset of another set

Determine if every element of one set appears in another.

sets subset membership boolean

Write a function `is_subset(subset: set, superset: set) -> bool` that returns `True` if `subset` is a subset of `superset`, and `False` otherwise. A set A is a subset of set B if every element of A is also an element of B. The empty set is a subset of every set.

Constraints

The inputs are Python sets with hashable elements. Element counts can be large (up to 10^6), so use efficient set operations. The function should not modify the input sets.

Example

>>> is_subset({1, 2}, {1, 2, 3})
True
>>> is_subset({1, 4}, {1, 2, 3})
False
>>> is_subset(set(), {1, 2})
True

10 points ~10 min

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Hints

Recall that Python sets support the `<=` operator for subset checking.

The empty set is a subset of every set.

A set is always a subset of itself.

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