What is the difference between defaultdict and dict in Python?

What is the difference between defaultdict and dict in Python?

In Python, a dict is a standard dictionary, while defaultdict is a subclass that provides a default value for nonexistent keys.

Can you give me an example of how defaultdict works?

Sure! If you create a defaultdict with a default type of int, it will initialize missing keys with 0.

How does that compare to a regular dict?

In a regular dict, accessing a nonexistent key raises a KeyError, while defaultdict returns the default value instead.

When should I use defaultdict over dict?

Use defaultdict when you want to avoid KeyErrors and need a default value for missing keys, like counting items.