BINGO! Give that man a CIGAR!
The specifics don't seem to be quite right (there is no
sys.last_traceback), but R.Bernstein put me directly on the correct
track. I misunderstood the traceback module documentation. OK, I just
plain didn't read it correctly, it's right there ("extract_stack():
Extract the raw traceback from the current stack frame."). The answer
is to use traceback.extract_tb (), called with sys.exc_info()[3] (the
stackframe that raised the exception).
Another sterling example of the benefits of reading the fine manual --
for comprehension this time.
Instead of:
aRawStack = traceback.extract_stack()
do this:
aRawStack = traceback.extract_tb(sys.exc_info()[2])
With this change, aRawStack contains the following:
>>> aRawStack[0][3]
'answer = apply(aMethod, [], {})'
>>> aRawStack[1][3]
'int(3).zork()'
This is *exactly* what I was seeking.
I appreciate all the responses, and especially appreciate the pointer
from R.Bernstein.
Thx,
Tom
On Dec 11, 4:49 am, [EMAIL PROTECTED] (R. Bernstein) wrote:
> brooklineTom <[EMAIL PROTECTED]> writes:
> > I want my exception handler to report the method that originally
> > raised an exception, at the deepest level in the call-tree. Let give
> > an example.
>
> > import sys, traceback
> > class SomeClass:
> > def error(self):
> > """Raises an AttributeError exception."""
> > int(3).zork()
>
> > def perform_(self, aSelector):
> > try:
> > aMethod = getattr(self, aSelector, None)
> > answer = apply(aMethod, [], {})
> > except: AttributeError, anAttributeErrorException:
> > aRawStack = traceback.extract_stack()
> > answer = None
>
> > When I call "perform_" (... SomeClass().perform_('error')), I want to
> > collect and report the location *within the method ("error") that
> > failed*. The above code reports the location of "perform_", and no
> > deeper in the call tree.
>
> > Anybody know how to accomplish this?
>
> extract_stack() without any arguments is getting this from the
> *current frame* which as you noted doesn't have the last exception
> info included which has been popped; variable sys.last_traceback has the
> frames
> at the time of the exception, I think.
>
> So in your code try changing:
> aRawStack = traceback.extract_stack()
> to
> aRawStack = traceback.extract_stack(sys.last_traceback)
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