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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