[issue17327] Add PyDict_GetItemSetDefault() as C-API for dict.setdefault()

[Stefan Behnel]

Stefan Behnel added the comment:

I had originally considered that name. However, what it really does is PyDict_GetItem(). In a specific special case, it sets a default value and *then* returns that. So it's still PyDict_GetItem(), just with a preceding modification. Also, the interface mimics PyDict_GetItem(). Its primary interface is a getter, not a setter.

I really think that PyDict_SetDefault() is an inappropriate name.

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<http://bugs.python.org/issue17327>
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