How can I use advanced features of dictionaries in Python?

How can I use advanced features of dictionaries in Python?

You can use features like dictionary comprehensions, nested dictionaries, and the defaultdict from the collections module.

Can you explain dictionary comprehensions with an example?

Sure! A dictionary comprehension allows you to create a dictionary in a single line. For example: {x: x**2 for x in range(5)} creates a dictionary of squares.

What about nested dictionaries? How do they work?

Nested dictionaries are dictionaries within dictionaries. You can access them using multiple keys, like dict1['key1']['key2'].

What is defaultdict and how is it different from a regular dictionary?

A defaultdict is a subclass of dict that provides a default value for a nonexistent key. For example, defaultdict(int) initializes missing keys with 0.