[Python-Dev] with_traceback (original) (raw)

Michael Foord fuzzyman at voidspace.org.uk
Sat Mar 3 01:20:24 CET 2007

Greg Ewing wrote:

Michael Foord wrote:

With the proposed changes, modules that do this would continue to work, surely ?

Probably, but it might mean they were no longer thread safe. An exception caught and raised in one thread would be vulnerable to having its traceback clobbered by another thread raising the same instance. Right - but that would still be no worse than the current situation where that information isn't available on the instance.

The current patterns would continue to work unchanged, but the new information wouldn't be available because a single instance is being reused.

There's also the possibility of a traceback unexpectedly kept alive causing GC problems -- cycles, files not closed when you expect, etc. That could be a problem, although explicitly closing files is always a good practise :-)

Michael Foord

-- Greg

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