[Python-Dev] Traceback style (original) (raw)

Guido van Rossum guido@python.org
Tue, 02 May 2000 08:22:24 -0400

> Ka-Ping Yee <ping@lfw.org>: > > With the suggested changes, this would print as > > > > Traceback (innermost last): > > Line 1 of > > Line 3 of , in Spam.eggs > > AttributeError: ham

ESR:

> IMHO, this is not a good idea. Emacs users like me want traceback > labels to be more like C compiler error messages, not less.

Ping:

I suppose Python could go all the way and say things like

Traceback (innermost last): :3 foo.py:25: in Spam.eggs AttributeError: ham but that might be more intimidating for a beginner. Besides, you Emacs guys have plenty of programmability anyway :) You would have to do a little parsing to get the file name and line number from the current format; it's no more work to get it from the suggested format.

Not sure -- I think I carefully designed the old format to be one of the formats that Emacs parses by default: File "...", line ... Your change breaks this.

(What i would really like, by the way, is to see the values of the function arguments on the stack -- but that's a lot of work to do in C, so implementing this with the help of repr.repr will probably be the first thing i do with sys.displaytb.)

Yes, this is much easier in Python. Watch out for values that are uncomfortably big or recursive or that cause additional exceptions on displaying.

--Guido van Rossum (home page: http://www.python.org/~guido/)