[Python-ideas] Negative limit for traceback.*

[Guido van Rossum]

I like this. It's kind of sad that when the limit causes truncation of the
traceback it drops the most recent frames, which might give a hint as to
what happens, and keeps the oldest frames, which are usually less
interesting (I know my program started at main() :-).


On Sun, Aug 24, 2014 at 10:48 AM, Thomas Allen <jsbfox at gmail.com> wrote:

> I'd like to propose adding the ability to extract last n stack trace
> entries from a traceback using functions from traceback module. Simply
> put, passing limit=-n would make functions to return (or print or
> yield) last abs(n) entries. No-brainer implementation for extract_tb:
>
>     extracted = list(_extract_tb_iter(tb, limit=(limit, None)[limit < 0]))
>     if limit is not None and limit < 0:
>         return extracted[limit:]
>     return extracted
>
> The motivation: http://stackoverflow.com/q/25472412/2301450
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-- 
--Guido van Rossum (python.org/~guido)
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