Web Reference: Sep 8, 2025 · The setdefault () method in Python is used with dictionaries to: Return the value of a specified key if it exists. If the key does not exist, it adds the key with a default value and returns that default. It’s a handy method for setting default values while avoiding overwriting existing ones. Definition and Usage The setdefault() method returns the value of the item with the specified key. If the key does not exist, insert the key, with the specified value, see example below I use setdefault() when I want a default value in an OrderedDict. There isn't a standard Python collection that does both, but there are ways to implement such a collection.
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