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Author bokunogf
Recipients bokunogf, docs@python
Date 2021-12-23.20:58:06
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Message-id <1640293086.43.0.363469814409.issue46168@roundup.psfhosted.org>
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Content 
Documentation link: https://docs.python.org/3/library/logging.config.html#configuration-file-format

It seems that the example for the "formatter_form01" formatter section specifies following for the style(please note the single-quotes around the value). 
style='%'

This seems to raise a ValueError with the message "Style must be one of..." when parsing the configuration file. Removing the single quotes seems to fix the issue:
style=%
History
Date User Action Args
2021-12-23 20:58:06bokunogfsetrecipients: + bokunogf, docs@python
2021-12-23 20:58:06bokunogfsetmessageid: <1640293086.43.0.363469814409.issue46168@roundup.psfhosted.org>
2021-12-23 20:58:06bokunogflinkissue46168 messages
2021-12-23 20:58:06bokunogfcreate