Vinay Sajip <vinay_sa...@yahoo.co.uk> added the comment:

> It looks like an unexpected behavior to me when reading the doc.

Perhaps you missed this?

https://docs.python.org/3/library/logging.html?highlight=exc_text#logging.Formatter.format

"Note that the formatted exception information is cached in attribute exc_text. 
This is useful because the exception information can be pickled and sent across 
the wire, but you should be careful if you have more than one Formatter 
subclass which customizes the formatting of exception information. In this 
case, you will have to clear the cached value after a formatter has done its 
formatting, so that the next formatter to handle the event doesn’t use the 
cached value but recalculates it afresh."

----------
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue44599>
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