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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.