New submission from Miro Hrončok <m...@hroncok.cz>: Hello,
based on some bug reports reported in: - https://github.com/GrahamDumpleton/mod_wsgi/issues/729 - https://github.com/poljar/weechat-matrix/issues/293 - https://bugzilla.redhat.com/show_bug.cgi?id=2030621 I have isolated the following reproducer that shows a regression in Python 3.10+. It happens at least with 3.10.0, 3.10.1 and 3.11.0a2. It works as expected in Python 3.9. The following code is valid and works on 3.9, 3.10, 3.11: ========================================= class Greeting(): pass def new_init(inst, name): inst.text = f"Hello, {name}\n" Greeting.__init__ = new_init Greeting("Miro") ========================================= But if we run it via a subinterpreter, it breaks on 3.10+: ========================================= import _testcapi code = r"""class Greeting(): pass def new_init(inst, name): inst.text = f"Hello, {name}\n" Greeting.__init__ = new_init Greeting("Miro")""" _testcapi.run_in_subinterp(code) ========================================= $ python3.9 reproducer.py (exits cleanly) $ python3.10 reproducer.py Traceback (most recent call last): File "<string>", line 9, in <module> TypeError: Greeting() takes no arguments $ python3.11 reproducer.py Traceback (most recent call last): File "<string>", line 9, in <module> TypeError: Greeting() takes no arguments My observation also shows that if the Greeting class already had (any) __init__: ========================================= class Greeting(): __init__ = ... ========================================= It works as expected on 3.9, 3.10, 3.11. In reality, this is most likely to affect classes with decorators, like: ========================================= import attr @attr.s class TestClass: foo = attr.ib() TestClass("Miro") ========================================= This works standalone, but fails in a subinterpreter: $ python3.10 reproducer.py Traceback (most recent call last): File "<string>", line 7, in <module> TypeError: TestClass() takes no arguments ---------- components: Subinterpreters messages: 408196 nosy: eric.snow, hroncok, vstinner priority: normal severity: normal status: open title: Patch-adding __init__ in a class takes no effect when called from a subinterpreter type: behavior versions: Python 3.10, Python 3.11 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue46034> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
