Neither ctypes nor cffi involves writing glue code. In fact you don’t even need another source file, let alone a whole other language toolchain (wait, you actually need two other source files plus your third-party dpp library).
Sure, I’ll be more specific: there’s no glue code for function calls. Whatever function you want to call doesn’t need to be declared up front, you just call it at runtime, and it’s looked up dynamically. However, data structures like arrays and structs need to be declared, if needed.
I'm not sure I understand your comment. Someone said they use pybind11, someone responded to that by saying pybind11 requires writing code, and you responded by saying ctypes and cffi don't.
OP presents their solution as an “easy” solution that doesn’t require glue code. Except there are already established native solutions that actually don’t require glue code.
