The Ultimate Guide to Python Programming With Python 3.10 - Collections Module

The video tutorial introduces the collections module in Python, focusing on the Counter and defaultdict classes. The Counter class is used to count occurrences of elements in a list, providing a dictionary of unique values and their counts. It also offers a method to list the most common elements. The defaultdict class is demonstrated for creating dictionaries with default values, preventing key errors when accessing non-existent keys. Examples include counting question attempts and managing a store inventory with product prices.

What happens when you try to access a key in a defaultdict that does not exist?

Describe the output you would expect when printing a defaultdict after adding a new product without specifying its value.