handling uncaught exceptions with pdb?
theller at python.net
Fri Sep 12 10:35:44 CEST 2008
Paul Rubin schrieb:
> I think I've asked about this before, but is there a way to set up
> Python to handle uncaught exceptions with pdb? I know about setting
> sys.except_hook to something that calls pdb, but this is normally done
> at the outer level of a program, and by the time that hook gets
> called, the exception has already unwound the stack to the outermost
> level. My situation is I run a multi-hour or multi-day computation
> that eventually crashes due to some unexpected input and I'd like to
> break to the debugger at the innermost level, right when the exception
> is encountered, so I can fix the error with pdb commands and resume
> processing. Of course this presumes a certain semantics for Python
> exceptions (i.e. handling one involves scanning the stack twice, once
> to look for a handler and again to actually unwind the stack) and I'm
> not sure if it's really done that way. I do know that Lisp has a
> requirement like that, though; so maybe there is hope.
Would this work (although it probably will slow down the program)?
import sys, pdb
def tracefunc(frame, event, arg):
if event == "exception":
if arg > 20:
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