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Another argument for Python is The Pilot System rule from The Mythical Man-Month (https://en.wikipedia.org/wiki/The_Mythical_Man-Month#The_pil...), which my experience completely supports. You need to focus on developer speed rather than execution speed or even correctness -- you will learn a lot and change your assumptions, take edge-cases into account etc. Only when you have a stable system it makes sense to start to isolate performance bottlenecks and replace them with optimised, low-level code.

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