[issue12339] logging.Formatter.format() assumes exception to support str() method which is not true for many libraries.

[Vinay Sajip]

Vinay Sajip <vinay_sajip at yahoo.co.uk> added the comment:

This is happening because if you pass an object instead of a string as the first argument in a logging call, it's treated as a message object whose __str__() will be called to get the actual message when it's needed, as documented here:

http://docs.python.org/howto/logging.html#arbitrary-object-messages

If, instead, you do it like this:

# coding: utf-8
import logging

logging.basicConfig()
try:
    raise Exception(u'ą')
except Exception:
    logging.getLogger('general').exception(u'An error occurred')

you get

ERROR:general:An error occurred
Traceback (most recent call last):
  File "bug_12339.py", line 6, in <module>
    raise Exception(u'ą')
Exception: \u0105

----------
resolution:  -> invalid
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12339>
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