Web Reference: When you say dict.setdefault(key, []), you are actually calling the unbound setdefault method on the 'dict' class object. It treats 'key' as its self pointer and tries to use ' []' as an index. Sep 8, 2025 · If their name isn’t in the dictionary yet, we need to create an entry first. Instead of checking every time if the name exists, we can use setdefault () to do both in one step- check and set a default list if needed 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
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