[docs] [issue33235] Better help text for dict.setdefault

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

Note that if we switch the order like you propose, we don’t need to use dict.get:


  set D[k]=d if k not in D then return D[k]


I suspect the current doc was written the way it is because it matches the actual implementation.

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<https://bugs.python.org/issue33235>
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