Author vstinner
Recipients Guido.van.Rossum, Mark.Shannon, christian.heimes, corona10, erlendaasland, gvanrossum, pablogsal, serhiy.storchaka, shihai1991, shreyanavigyan, vstinner
Date 2021-04-30.11:28:38
SpamBayes Score -1.0
Marked as misclassified Yes
Message-id <1619782118.43.0.699262595456.issue43908@roundup.psfhosted.org>
In-reply-to
Content
https://docs.python.org/dev/c-api/typeobj.html#Py_TPFLAGS_IMMUTABLETYPE says:
"This bit is set for type objects that are immutable: type attributes cannot be set nor deleted."

Is it possible that a metatype (type subtype) overrides tp_setattro and ignores the Py_TPFLAGS_IMMUTABLETYPE flag? Should we suggest that metatypes implemented in C and overridding tp_setattro should take the Py_TPFLAGS_IMMUTABLETYPE flag in account?

When a type overrides tp_setattro, I understand that it's fine since it's only used to set attributes of its instances, not on the type itself.

--

See also bpo-43770 "Rework C types initialization": some types explicitly sets explicitly tp_setattro to PyObject_GenericSetAttr. But it's unrelated since it's used to set attributes of type instances.
History
Date User Action Args
2021-04-30 11:28:38vstinnersetrecipients: + vstinner, gvanrossum, christian.heimes, Mark.Shannon, serhiy.storchaka, Guido.van.Rossum, corona10, pablogsal, shihai1991, erlendaasland, shreyanavigyan
2021-04-30 11:28:38vstinnersetmessageid: <1619782118.43.0.699262595456.issue43908@roundup.psfhosted.org>
2021-04-30 11:28:38vstinnerlinkissue43908 messages
2021-04-30 11:28:38vstinnercreate