objdelattrCname

objdelattrCname is a term that appears in discussions of CPython’s C API to denote the C-level implementation of attribute deletion for Python objects. The “Cname” suffix signals that this is a symbol name used in the C source code, rather than a directly exposed Python API function. In practice, objdelattrCname represents the function that handles the delattr operation for a specific type or object, as part of the type’s internal attribute-management logic.

In CPython, deleting an attribute (the del obj.attr operation) is wired through the type’s attribute deletion mechanism. The stable, public entry point is PyObject_DelAttr, which delegates to the type’s slot for deletion. A type may provide a custom deletion function by implementing the tp_delattr slot (or by using a suitable internal helper) and, in generated or well-documented sources, this function may be labeled with a C-level name such as objdelattrCname. The actual behavior follows Python’s attribute-deletion semantics: data descriptors with __delete__ are invoked first, then the attribute is removed from the instance dictionary, and an AttributeError is raised if deletion is not possible.

For extension developers, implementing a custom delattr function involves defining a C function and assigning it to the type’s deletion slot. This allows precise control over what can be deleted and under what conditions, including integration with descriptors and custom object state.

Note that objdelattrCname is not part of the public, stable Python C-API naming; it is an internal symbol style that may vary between versions or be used primarily in source explorations, code generation, or bindings. See PyObject_DelAttr and tp_delattr for the standard, documented pathways.