[issue45158] Refactor traceback.py to make TracebackException more extensible.

[Anton Abrosimov]

Anton Abrosimov <abrosimov.a.a at gmail.com> added the comment:

I think now is a good time for such a change. `FrameSummary`,` StackSummary` and `TracebackException` can be left backward compatible. And PEP 657 already breaks backward compatibility of output parsers.

----------

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45158>
_______________________________________