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Three little enhancements/mini-bugs:
1) Adding the following lines to the "main part" of pdb.py 
gives it the ability to stay in pdb if the program crashes. 
Very handy!
 # Ensure that we end up in pdb if we crash
 def pdb_on_crash(type, value, tb):
 sys.__excepthook__(type, value, tb)
 post_mortem(tb)
 sys.excepthook = pdb_on_crash
2) There's also a problem in the last lines of pdb.py:
 # Insert script directory in front of module search path
 sys.path.insert(0, os.path.dirname(filename))
This leaves the directory path under which pdb.py was 
invoked in sys.path. This is a problem if pdb.py was 
invoked e.g. via a link a la /usr/pdb. This leads to the last 
and related suggestion.
3) It would be very convenient if a pyhon installation would 
also install a link /usr/pdb -> /usr/lib/python2.3/pdb.py. 
This provides for easy invocation and, for example, it's also 
the default command used by Emacs' pdb-mode.

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a note for the reviewer:
patch #896011 fixes bug (2) and implements (in a different
manner but with the same result) feature (1),
PS. I would also like to add my vote for (3). Being a
command line tool pdb.py deserves to be installed right next
to python binary..(on Linux that would often be /usr/bin)

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Note that 3 is no longer necessary now we have 'python -m'.

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Fixed (1) and (2) by appling patch #896011.