What is an immutable dictionary?

Can you explain what an immutable dictionary is?

An immutable dictionary is a type of dictionary that cannot be changed after it is created. This means you can't add, remove, or modify its items.

Why would someone use an immutable dictionary instead of a regular one?

Immutable dictionaries are useful for ensuring data integrity, especially in concurrent programming, where multiple threads might access the same data.

Can you give me an example of how to create one in Python?

Sure! In Python, you can use the types.MappingProxyType to create an immutable view of a dictionary. Here's an example:

from types import MappingProxyType

original_dict = {'a': 1, 'b': 2}
immutable_dict = MappingProxyType(original_dict)

What happens if I try to modify it?

If you try to modify an immutable dictionary, you'll get a TypeError. It prevents any changes to maintain its immutability.