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Bug description:
This worked fine on previous versions:
importloggingimportlogging.configimportlogging.handlersimportmultiprocessingasmpdefmain():config= {'version':1,'handlers': {'sink': {'class':'logging.handlers.QueueHandler','queue':mp.get_context('spawn').Queue(), }, },'root': {'handlers': ['sink'],'level':'DEBUG', }, }logging.config.dictConfig(config)if__name__=='__main__':main()
With Python 3.12, it drops an error:
Traceback (most recent call last): File "/home/egor/.pyenv/versions/3.12-dev/lib/python3.12/logging/config.py", line 581, in configure handler = self.configure_handler(handlers[name]) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/home/egor/.pyenv/versions/3.12-dev/lib/python3.12/logging/config.py", line 786, in configure_handler raise ValueError('No handlers specified for a QueueHandler')ValueError: No handlers specified for a QueueHandlerThe above exception was the direct cause of the following exception:Traceback (most recent call last): File "/home/egor/workspace/personal/cimple/../test.py", line 25, in <module> main() File "/home/egor/workspace/personal/cimple/../test.py", line 21, in main logging.config.dictConfig(config) File "/home/egor/.pyenv/versions/3.12-dev/lib/python3.12/logging/config.py", line 912, in dictConfig dictConfigClass(config).configure() File "/home/egor/.pyenv/versions/3.12-dev/lib/python3.12/logging/config.py", line 588, in configure raise ValueError('Unable to configure handler 'ValueError: Unable to configure handler 'sink'More than that, even the example in the Logging Cookbook is broken now:https://docs.python.org/3/howto/logging-cookbook.html#a-more-elaborate-multiprocessing-example (fails with the same error).
Version info:
# python -VVPython 3.12.0+ (heads/3.12:f108785, Nov 1 2023, 19:47:19) [GCC 13.2.1 20230801]CPython versions tested on:
3.12
Operating systems tested on:
Linux
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