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. 2 days ago · defaultdict is a dict subclass that calls a factory function to supply missing values. It is part of the collections module that provides specialized container datatypes for Python. Learn how to use the Python defaultdict type, a dictionary-like class that automatically creates and fills missing keys with default values. See examples of how to group, count, accumulate, and emulate defaultdict with regular dictionaries.
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