[issue41647] MutableMapping ".setdefault()" to return default value via __getitem__

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan <tir.karthi at gmail.com>:


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nosy: +rhettinger

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41647>
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