zope.testing.testrunner.debug.post_mortem and try/finally

When a try/finally clause is (appropriately) used to do cleanup after an
exception during a test run, it often tears down parts of the fixture
that are needed in order to do useful post_mortem debugging of the
exception, such as closing the request or db connections.  What is the
best way to do post_mortem debugging with the stack in the state it was
at the time of the exception?

For a while now, I've been repeatedly modifying eggs in my development
environment at the relevant try/finally clauses to invoke post_mortem
before the tear down is done, sub-optimal to say the least.  :)  I find
myself doing it often its time to invest in a better way.

Is there some Python voodoo I'm unaware of to get a post_mortem to
reflect the stack before try/finally clauses?  If not, is putting
some sort of hook into the relevant try/finally clauses the best way to
address this?  If not, what should I be doing?

If putting hooks into the try/finally clauses is the right way, then it
would be nice to have a somewhat canonical way to do this.  It would
also be nice to have a way to pass something down the line so that
post_mortem() only gets called once per exception.

Thoughts,
Ross

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