[Python-Dev] Reference cycles in Exception.__traceback__

[Yury Selivanov]

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?

It should be about the same time to reconstruct traceback and
its frames without locals, as to create named tuples.


Yury