[Python-Dev] Reference cycles in Exception.traceback (original) (raw)

Antoine Pitrou solipsis at pitrou.net
Thu Mar 6 16:52:56 CET 2014

Le 06/03/2014 16:03, Yury Selivanov a écrit :

On 2014-03-06, 8:42 AM, Antoine Pitrou wrote: Le 05/03/2014 23:53, Nick Coghlan a écrit :

traceback wouldn't change [...] Uh, really? If you want to suppress all reference cycles, you have to remove traceback. The problem is to make computation of the traceback summary lightweight enough that it doesn't degrade performance in the common case where you don't have to print the traceback later. So why can't we allow instantiation of types.TracebackType & types.FrameType?

IMO it is absolutely out of question to allow creation of arbitrary frames from Python code, because the structure and initialization of frames embody too many low-level implementation details.

We might allow the creation of traceback objects, but without any custom frame objects it is unclear how useful that would be.

Regards

Antoine.

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