Web Reference: 23 hours ago · It is a collection where elements are stored as dictionary keys and their counts are stored as dictionary values. Counts are allowed to be any integer value including zero or negative counts. 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.
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