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 The solution is to use setdefault() as the last step of saving the computed composite member -- if another has already been saved then it is used instead of the new one, guaranteeing unique Enum members.
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