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In Python 2.6, pdb doesn't show exception strings properly:
#somecode.py
import pdb
pdb.set_trace()
raise Exception('This is a message that contains a lot of characters and is very long indeed.')
#terminal
> somecode.py
-> raise Exception('This is a message that contains a lot of characters and is very long indeed.')
(Pdb) n
Exception: Exceptio...ndeed.',)
The pdb code assumes that sys.exc_info()[1] is a string. In fact it's an Exception instance.
The solution I found was to use str()
#pdb.py line 186
print >>self.stdout, exc_type_name + ':', _saferepr(str(exc_value))
This may have been fixed already but I couldn't find any reference to it.

As far as I can see it has been. In both 2.7 and 3.3 I get:
rdmurray@hey:~/python/p33>./python somecode.py
> /home/rdmurray/python/p33/somecode.py(3)<module>()
-> raise Exception('This is a message that contains a lot of characters and is very long indeed.')
(Pdb) n
Exception: This is a message that contains a lot of characters and is very long indeed.
> /home/rdmurray/python/p33/somecode.py(3)<module>()
-> raise Exception('This is a message that contains a lot of characters and is very long indeed.')
(Pdb)

The bug affects me on python 2.7, as described by the original reporter.
I am using Ubuntu 12.04 which comes with python 2.7.3 - was this fixed for 2.7 quite recently?
However the python 3.2 that is packaged for Ubuntu 12.04 does not suffer from this bug.