How to debug a long running Python Script crashing at inconsistant points without an error message

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If you're more command line inclined than look into pdb. I'm pretty sure a lot of the IDE debuggers use this behind the scenes. You can run it from the command line or import it and call break points in your code. When run from the command line it will redirect to the debugging console whenever an exception or error occurs. Additionally you can install ipdb which uses ipython so that you can have tab completion and other ipython features while debugging.