-----Original Message-----
From: python-list-bounces+ramit.prasad=jpmorgan....@python.org
[mailto:python-list-bounces+ramit.prasad=jpmorgan....@python.org] On Behalf Of
MRAB
Sent: Friday, October 14, 2011 5:50 PM
To: python-list@python.org
Subject: Re: Re-raise different exception with original stack trace
On 14/10/2011 22:30, Prasad, Ramit wrote:
> Hi all,
> Hopefully you guys can help me with my problem.
>
> Basically I have a UI program that can "save" information. The UI passes the
> save to the controller and the controller saves a file and does some post
> processing. If saving the file fails, I want to handle the error differently
> than if the error was in post processing. In both cases the possible
> exceptions are varied and unknown so I cannot pick and choose certain
> exception. The problem with the sample program below is that the stack trace
> is replaced by the re-raise. What would be the best way(s) to get the
> original stack trace in save_from_UI if the exception occurs in post_process?
> Using Python 2.6 and Windows(XP and 7) / Linux.
>
> Def save_from_model():
> save() # do not catch exception (could be any exception)
> try:
> post_process()
> except Exception as e:
> #do something
> raise CustomException() # "wrap" exception so bar knows to handle it
> differently
>
> def save_from_UI():
> try:
> foo()
> except CustomException() as e:
> # How do I get the original stacktrace instead of the reraise?
> except Exception as e:
> # do something else with this exception
>
You could save a reference to the exception in the custom exception:
class CustomException(Exception):
def __init__(self, e):
Exception.__init__(self)
self.exc = e
def save_from_model():
save() # do not catch exception (could be any exception)
try:
post_process()
except Exception as e:
#do something
raise CustomException(e)
def save_from_UI():
try:
foo()
except CustomException as e:
# Original exception is e.exc
except Exception as e:
# do something else with this exception
=======================================================================
Yes, but raising the CustomException replaces the last traceback and even with
the saved exception, how would you get the original stacktrace? The only thing
I can think is get the stacktrace and store it in the exception. That does not
seem very Pythonic to me.
Ramit
Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423
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