How are some modules in python created in C, C++ or any other language?

Question

I saw that numpy was created in python and c but how does it actually work? and How can I build one myself? ofcourse its not just the numpy there are so many modules like that.

Also its not just the python and c, if I want to create a library for ruby or any other language and use python or any other languages, how could I do it?

Answer 1

https://realpython.com/build-JUMP_LINK__&&__python__&&__JUMP_LINK-c-extension-module/