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I use mostly Python, and a bit of Rust.

With Python, testing, good hygiene and a bit of luck you can write core that is maybe 99% reliable. It is very, very hard to get to (100-eps)% for eps < 0.1% or so. Rust seems better suited to that.

Anything else, especially if there isn't a huge premium on speed, meh - Python is almost always sufficient, and not in the way.

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I use the same combo: lots of Python to analyse problems, test algos, process data, etc. Then, once I settle on a solution but still need more performance (outside GPU's), I go to rust.

Genuinely curious, why do you need Rust?

I'm simulating an audio speaker in real time. So I do the data crunching, model fitting, etc. in python and this gives me a godd theoretical model of the speaker. But to be able to make a simulation in realtime, I need lots of speed so rust makes sense there (moreover, the code I have to plug that in is rust too, so one more reason :-)). (now tbh, my realtime needs are not super hard, so I can avoid a DSP and a real time OS :-) )

I don't need rust specifically. It's just that its memory and thread management really help me to continue what I do in python: focusing on my core business instead of technical stuff.

The less I code the better I feel :-)

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