What are the methods available for frozen sets in Python?

What are the methods available for frozen sets in Python?

In Python, frozen sets are immutable sets. The main methods available are:

1. copy() - Returns a shallow copy of the frozen set.
2. difference() - Returns the difference between two or more frozen sets.
3. intersection() - Returns the intersection of two or more frozen sets.
4. union() - Returns the union of two or more frozen sets.
5. issubset() - Checks if a frozen set is a subset of another set.
6. issuperset() - Checks if a frozen set is a superset of another set.

Can you give me an example of using the union() method?

Sure! Here's an example:

fs1 = frozenset([1, 2, 3])
fs2 = frozenset([3, 4, 5])
result = fs1.union(fs2)
print(result)  # Output: frozenset({1, 2, 3, 4, 5})

This combines the elements of both frozen sets.

What about the difference() method?

The difference() method returns a new frozen set with elements in the first frozen set that are not in the second. Here's an example:

fs1 = frozenset([1, 2, 3])
fs2 = frozenset([2, 3, 4])
result = fs1.difference(fs2)
print(result)  # Output: frozenset({1})

This shows that 1 is in fs1 but not in fs2.

Are there any limitations to using frozen sets?

Yes, since frozen sets are immutable, you cannot add or remove elements after creation. This makes them suitable for use as dictionary keys or elements of other sets.