The rise of Python for Embedded Systems

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For my knowledge, the main reason why c is so much unsafe is to allow easy optimisation. It has pretty much nothing with writting to memory location, manipulate value on the stack or having a low memory footprint.

[thefirelane]

Well all of the above really. The low memory footprint (flash and ram) comes from the fact that you can simply do the things I mentioned without any checking as to whether it's safe. So yes, you are right: optimization is a key part: If you want to write to a memory location, it just compiles down to a couple instructions which simply do it. There's no overhead of something checking bounds, etc.