Take the following sample code:

import os

if __name__ == "__main__":
    try:
        print os.environ ["PWDx"];
    except KeyError:
        print "Key error";
print "Hello World";

Since there is no PWDx environment variable, a KeyError will be thrown. However, upon hitting the line 'print os.environ
[PWDx]', the debugger will terminate. Here's the output from the console:

>>>Exception in thread MainThread:Traceback (most recent call last):
  File "/export/home/bleonard/.netbeans/6.7/jython-2.5/Lib/threading.py", line 247, in _Thread__bootstrap
    self.run()
  File "/export/home/bleonard/.netbeans/6.7/config/nbPython/debug/nbpythondebug/jpydaemon.py", line 590, in run
    exec self._cmd in self._myglobals,self._mylocals
  File "<string>", line 1, in <module>
  File "/tmp/NewPythonProject/src/newpythonproject.py", line 8, in <module>
    print os.environ ["PWDx"];
  File "/tmp/NewPythonProject/src/newpythonproject.py", line 8, in <module>
    print os.environ ["PWDx"];
  File "/export/home/bleonard/.netbeans/6.7/config/nbPython/debug/nbpythondebug/jpydaemon.py", line 681, in trace_dispatch
Debug session normal end
    if not self.discardedException(arg) :
  File "/export/home/bleonard/.netbeans/6.7/config/nbPython/debug/nbpythondebug/jpydaemon.py", line 631, in
discardedException
    tb  = exc_stuff[2]
IndexError: index out of range: 2
>>>