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. Learn about advanced Python dictionary types including defaultdict, Counter, OrderedDict, and strategies for complex data structures. Advanced dictionary structures like defaultdict are commonly used in real-world Python programs. Understanding how defaultdict works can simplify many coding tasks such as counting, grouping, and data aggregation.
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