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The CPython interpreter, aptly named, is written in C. There are other implementations written in Java, etc.

Straightforward C is slow; straightforward python is medium speed; expertly written C (the foundations of python) is fast

> Straightforward C is slow;

I've never found it to be so, and it's not a common complaint.

Citation needed. My C compiler can optimize even awful code very well.

> Straightforward C is slow;

Would you care to elaborate? I typed "man straightforward" into terminal and nothing was thrown back at me.

Thanks for reminding me of that, I will have a look.

Yes, but so are the interpreters and compilers of many other languages.