Web Reference: The argument to defaultdict should be a function. defaultdict(int) is a dictionary, while lambda: defaultdict(int) is function that returns a dictionary. 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. Jan 4, 2017 · From the documentation of defaultdict: If default_factory is not None, it is called without arguments to provide a default value for the given key, this value is inserted in the dictionary for the key, and returned.
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