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Even there, many of those libraries are written in C, Fortran and C++.

On can use any bindings to those libraries, including using modern versions of Fortran and C++ directly.

Not necessarily ML, more generally - numeric, as in NumPy/scipy/pandas, variety of optimisers, plotting and reporting tools and whatnot.

This is the only reply to my question that makes sense, thanks!

All of the other replies are subjective.