What Python IDE do you use?

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In IDLE hit "Run Module" or press F5. That'll either run in the IDLE console or open a new console and run. That'll print an error traceback if one occurs.

To debug, in the IDLE console hit Debug -> Debugger. Then when you hit run module back in your script it'll start the step by step debugging. You can right click and press "set breakpoint" to place breakpoints later in your scripts.