Dumb noob questions: I've installed python 3.3 on my Slack box, which by default comes with python 2.7. I know how to fire up the different IDLE environments, but how do I differentiate between the scripts? IOW, up till now, I've used .py on all my 2.7 files. How do I know not to run a .py in python3 or visa versa? Or do I? What's the excepted convention for differentiating between the two?
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