What are some advanced techniques for using dictionaries in Python?

What are some advanced techniques for using dictionaries in Python?

You can use techniques like dictionary comprehensions, merging dictionaries, and using defaultdict for missing keys.

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 merging dictionaries? How can I do that?

You can merge dictionaries using the update() method or the | operator in Python 3.9 and later. For example: dict1 | dict2.

What is defaultdict and when should I use it?

defaultdict is a subclass of the built-in dict that provides a default value for missing keys. It's useful when you want to avoid key errors.