How do sets and frozensets compare in terms of performance?

What are the performance differences between sets and frozensets in Python?

Sets are mutable, allowing for dynamic changes, while frozensets are immutable, which can lead to performance benefits in certain scenarios.

Can you give me an example where one is faster than the other?

Sure! If you're frequently adding or removing elements, sets will perform better. However, frozensets can be faster for membership tests due to their immutability.

Are there any memory usage differences between them?

Yes, frozensets generally use slightly more memory than sets because they need to store additional information to maintain immutability.

When should I use a frozenset instead of a set?

Use a frozenset when you need a constant collection of items that won't change, especially when using it as a key in a dictionary.