So, ipdb is the ipython version of pdb. In fact, post_mortem is a
pdb function. I use ipdb because its REPL is a bit nicer to work
with then pdb.
-----Original Message-----
From: Stefan Ram <r...@zedat.fu-berlin.de>
Subject: Re: Drop into REPL when your program crashes.
Date: 09/08/2025 06:04:16 PM
Newsgroups: comp.lang.python
Annada Behera <annada@tilde.green> wrote or quoted:
> Recently I have been increasingly adding this piece of code as
> a preamble to a lot of my code.
>
> import (sys, os, ipdb)
>
> def debug_hook(exc_type, exc_value, traceback):
> if exc_type is KeyboardInterrupt:
> sys.__excepthook__(exc_type, exc_value, traceback)
> return
> print(f"Uncaught exception: {exc_type.__name__}: {exc_value}")
> ipdb.post_mortem(traceback)
>
> if os.environ.get('DEBUG'): sys.excepthook = debug_hook
Thanks!
I have changed it a bit to work without "ipdb" and added demo code.
import sys
import os
import pdb
i = 1
def debug_exception_hook(exc_type, exc_value, tb):
i = 2
if issubclass(exc_type, KeyboardInterrupt):
# Call the default excepthook for KeyboardInterrupt to allow
clean exit
sys.__excepthook__(exc_type, exc_value, tb)
return
print(f"Uncaught exception: {exc_type.__name__}: {exc_value}")
pdb.post_mortem(tb)
def cause_exception():
# Function to demonstrate an unhandled exception
i = 3
return 1 / 0 # Will raise ZeroDivisionError
def f():
# Function to demonstrate an unhandled exception
i = 4
cause_exception()
return i
if __name__ == "__main__": # demo code
import os; os.environ['DEBUG'] = 'true'
if os.environ.get('DEBUG'):
sys.excepthook = debug_exception_hook
print("Debug mode enabled: Using pdb post-mortem on uncaught
exceptions.")
else:
print("Debug mode not enabled: Regular exception handling.")
# Run demo to trigger exception
i = 5
f()
Then, I got this dialog:
Debug mode enabled: Using pdb post-mortem on uncaught exceptions.
Uncaught exception: ZeroDivisionError: division by zero
> debug_hook.py(19)cause_exception()
-> return 1 / 0 # Will raise ZeroDivisionError
(Pdb) i
3
(Pdb)
.
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