Setdefault bypasses __setitem__

[Fredrik Lundh]

Peter Otten wrote:

> Are we talking about the same setdefault()?
>
> setdefault(...)
>    D.setdefault(k[,d]) -> D.get(k,d), also set D[k]=d if k not in D

note that it might be spelled "setdefault", but it should be pronounced
"get or set".

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