What are some examples of frozensets in Python?

What are some examples of frozensets in Python?

Frozensets are immutable sets in Python. Here are a few examples:

1. Creating a frozenset from a list: fs = frozenset([1, 2, 3])
2. Using a frozenset as a dictionary key: my_dict = {fs: 'value'}
3. Performing set operations: fs1 = frozenset([1, 2, 3]) and fs2 = frozenset([3, 4, 5]) can be combined using union: fs1 | fs2.

Can you explain why frozensets are useful?

Frozensets are useful because they are hashable and can be used as keys in dictionaries or elements in other sets. Their immutability ensures that the data remains constant, which is important in certain applications like caching.

Are there any limitations to using frozensets?

Yes, since frozensets are immutable, you cannot add or remove elements after creation. This limits their flexibility compared to regular sets.

Can you show me how to convert a regular set to a frozenset?

Sure! You can convert a regular set to a frozenset using the frozenset() constructor. For example:

my_set = {1, 2, 3}
my_frozenset = frozenset(my_set)