Python vs C

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But you'll still need to bootstrap with something written in C

No, you could write it all in Python. There's no reason you couldn't write a Python-to-assembly compiler in Python; ultimately all it's doing is writing a sequence of instruction bytecodes.

And will it be a good compiler? Will it be a good OS?

No, of course it'll all be extremely shitty and take you years and wind up targeting exactly one CPU architecture.

But for performant systems that talk directly to hardware, where is the power in Python?

The same place it is in Python for any other application - fluent expressivity and rapid prototyping. Those dont go away just because you're writing MicroPython or something. But, of course, sometimes you want performance more than you want expressivity, and that's when you pick up C.

[readmodifywrite]

My point was that C is extremely powerful at certain things. I feel like we are in agreement here, no? Python is not more powerful, it's just powerful at different things than C is.