[Python-Dev] with_traceback

[Michael Foord]

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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