Open
Description
Bug report
In Python 3.11, raising a frozen dataclass as an exception inside a contextlib.contextmanager context will raise a dataclasses.FrozenInstanceError exception. This issue does not occur in Python 3.10.
This is a result of the changes made in #92202
Reproducer
import contextlib
import dataclasses
@dataclasses.dataclass(frozen=True)
class Notice(Exception):
pass
@contextlib.contextmanager
def demo():
yield
try:
with demo():
raise Notice()
except Notice:
passExpected Result
$ python3.10 ./repro.pyActual Result
$ python3.11 ./repro.py
Traceback (most recent call last):
File "/usr/lib/python3.11/contextlib.py", line 155, in __exit__
self.gen.throw(typ, value, traceback)
File "/home/mclay/code/mattclay/contextlib-repro/./repro.py", line 12, in demo
yield
File "/home/mclay/code/mattclay/contextlib-repro/./repro.py", line 17, in <module>
raise Notice()
Notice
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/home/mclay/code/mattclay/contextlib-repro/./repro.py", line 16, in <module>
with demo():
File "/usr/lib/python3.11/contextlib.py", line 188, in __exit__
exc.__traceback__ = traceback
^^^^^^^^^^^^^^^^^
File "<string>", line 4, in __setattr__
dataclasses.FrozenInstanceError: cannot assign to field '__traceback__'Your environment
$ python3.10 -V
Python 3.10.6
$ python3.11 -V
Python 3.11.0
$ source /etc/os-release; echo $PRETTY_NAME
Ubuntu 22.04.1 LTS
$ uname -a
Linux redstone 5.11.0-27-generic #29~20.04.1-Ubuntu SMP Wed Aug 11 15:58:17 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux