Web Reference: Oct 4, 2025 · In Python, defaultdict is a subclass of the built-in dict class from the collections module. It automatically assigns a default value to keys that do not exist, which means you don’t have to manually check for missing keys and avoid KeyError. In this step-by-step tutorial, you'll learn how the Python defaultdict type works and how to use it for handling missing keys when you're working with dictionaries. You'll also learn how to use a defaultdict to solve problems like grouping or counting the items in a sequence or collection. To create a defaultdict, we need to import the defaultdict class from the collections module. To do that, we can use the following line of code. Example of importing the defaultdict in Python The defaultdict takes a function as an argument to return values for missing keys. So let us define a function that returns a default value. Example of defini...
YouTube Excerpt: In today's video we're going to be learning how we can use defaultdict in
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