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. The defaultdict tool is a container in the collections class of Python. It's similar to the usual dictionary (dict) container, but it has one difference: The value fields' data type is specified upon initialization. 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...
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