I was under the impression that Numpy also just calls BLAS underneath? Hence why doing element-wise calls in Numpy is far, far faster than simply doing nested for loops.

But I think this is the great strength of Python. It's a glue language. If you need speed, you can always write a wrapper around a C/C++ library.

> SciPy or numpy might be better examples.

Python comprises less than 50% of the code in both of those repositories, but they are certainly great for learning the CPython API.