New submission from Dino Viehland <dinoviehl...@gmail.com>:
This is another catch of using PyType_FromSpec (similar to https://bugs.python.org/issue26979 but also completely different). Because PyType_FromSpec produces a heap type it gets the Py_TPFLAGS_HEAPTYPE flag set on the newly produced type. To enforce the immutability of built-in types type_setattro checks this flag. Therefore these types end up being mutable, e.g: import _ssl _ssl.SSLError.x = 42 In addition to not providing parity for replacing PyType_Ready in the stable API, it also means that this could presumably bleed across sub-interpreters or just provide surprising and bad results. ---------- components: Interpreter Core messages: 343100 nosy: dino.viehland, eric.snow, vstinner priority: normal severity: normal status: open title: PyType_FromSpec can't create immutable types versions: Python 3.8, Python 3.9 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue37002> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
