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Tue Nov 24 16:33:09 EST 2015 · https://mail.python.org/pipermail/python-dev/2015-November/142290.html

Ooooh, that's probably really old code. I guess for the slots the
reasoning is to save on slots. For the public functions, alas it will
be hard to know if anyone is depending on it, even if it's
undocumented. Perhaps add a deprecation warning to these if the value
is NULL for one release cycle?

On Tue, Nov 24, 2015 at 1:21 PM, Serhiy Storchaka <storchaka at gmail.com> wrote:
> Slots like PyTypeObject.tp_setattr, PySequenceMethods.sq_ass_item,
> PyMappingMethods.mp_ass_subscript are used not only for setting
> attribute/item value, but also for deleting attribute/item (if value is
> NULL). This is not documented and should be. [1]  Correspondingly public API
> functions like PyObject_SetAttr, PyObject_SetItem, PySequence_SetItem,
> PySequence_SetSlice, PyMapping_SetItemString can be used for deleting. But
> all these functions have special counterparts for deleting: PyObject_DelAttr
> etc.
>
> The question is wherever deleting ability of Set-functions is intentional,
> should we document this or deprecate and then delete?
>
> [1] http://bugs.python.org/issue25701
>
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[Python-Dev] Deleting with setting C API functions