Web Reference: 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. 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.
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