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

Greg Ewing greg.ewing at canterbury.ac.nz
Fri Mar 2 05:05:12 CET 2007

Guido van Rossum wrote:

You start with a traceback object pointing to the current frame object (traceback objects are distinct from frame objects,

Just out of curiosity, is it really necessary to have a distinct traceback object? Couldn't the traceback just be made of dead frame objects linked the opposite way through their f_next pointers?

Seems to me it would be advantageous if raising an exception (once it's created) could be done without having to allocate any memory. Otherwise you could get the situation where you're trying to raise a MemoryError, but there's no memory to allocate a traceback object, so you raise a MemoryError... etc...

That might be a reason for pre-allocating the MemoryError exception, too.

-- Greg

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