Ah, my mistake. I know that CPython and matplotlib both have a lib/ directory, but you're right that that's where they keep the Python code and they keep the C

Ah, my mistake. I know that CPython and matplotlib both have a lib/ directory, but you're right that that's where they keep the Python code and they keep the C code in Modules/ and src/, respectively. Also I may have confused this with the src/ layout in the past and put my own C extensions into lib/. Thanks for the survey, I think I've been harboring this misconception for a while now.