Get last exception in pdb

Question

Is there a way to examine the last exception when in pdb/before entering pdb? (Using python 2.7.5).

Immediately (yes, I enter no other commands at all) after an exception being raised in my code, I do sys.exc_info(); this just results in (None, None, None). At this point, I can do pdb.pm(), and pdb starts at the point that the exception is raised.

I'd like to be able to examine this exception object (it is not stored in a variable before being raised).

There is nothing obviously helpful in http://docs.python.org/2/library/pdb.html or http://docs.python.org/2/library/sys.html

Edit: I know about set_trace. I'd like to examine the exception before I modify the code.

Answer 1

Is this what you are looking for?

import pdb try:     1/0 except Exception as err:     pdb.set_trace() 

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% test.py --Return-- > /home/unutbu/pybin/test.py(8)<module>()->None -> pdb.set_trace() (Pdb) err ZeroDivisionError('integer division or modulo by zero',) (Pdb) quit 

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If you do not want to modify the code where the exception originates, you could instead redefine sys.excepthook:

import pdb import sys def excepthook(type, value, traceback):     pdb.set_trace() sys.excepthook = excepthook  1/0 

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% test.py --Return-- > /home/unutbu/pybin/test.py(7)excepthook()->None -> pdb.set_trace() (Pdb) type <type 'exceptions.ZeroDivisionError'> (Pdb) value ZeroDivisionError('integer division or modulo by zero',) (Pdb) traceback <traceback object at 0xb774f52c> (Pdb)  

Answer 2

You can retrieve the latest exception in pdb/ipdb via:

__exception__ 

The above is actually a tuple of the (exception, message).