[issue22039] PyObject_SetAttr doesn't mention value = NULL

[Petr Viktorin]

Petr Viktorin <encukou at gmail.com> added the comment:

This cannot be changed in 3.x, since the PyObject_DelAttr macro calls PyObject_SetAttr(..., NULL), and the macro is expanded in all extensions that use the stable ABI.
(Technically, it would be possible to add a PyObject_SetAttr *macro* that would warn/fail, while keeping the PyObject_SetAttr *function* untouched, but that would be a pain to test/maintain.) 

The wording could be clarified to something like: "This behaviour is deprecated in favour of using PyObject_DelAttr(), but there are currently no plans to remove it."

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<https://bugs.python.org/issue22039>
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