[issue1295] logging records cache the result of formatException()

[Guido van Rossum]

Guido van Rossum added the comment:

This is tough. On the one hand you are right that different classes that
have different formatException() methods aren't treated correctly; on
the other hand I think the caching is important for other cases where
there are multiple loggers all using the default formatException().

I recommend that instead of getting rid of the cache, you fix your class
by overriding format() to reset record.ex c_text and then calling the
base class format() method.

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nosy: +gvanrossum

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Tracker <report at bugs.python.org>
<http://bugs.python.org/issue1295>
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