"Writing extension modules for pypy" https://doc.pypy.org/en/latest/extending.html https://doc.pypy.org/en/latest/extending.html ; CFFI, ~ ctypes (libffi), cpp

"Writing extension modules for pypy" https://doc.pypy.org/en/latest/extending.html https://doc.pypy.org/en/latest/extending.html ; CFFI, ~ ctypes (libffi), cppyy, or RPython