Calling Rust from Python/PyPy using CFFI (C Foreign Function Interface)

This is a small demo of how to create a library in Rust and call it from Python (both CPython and PyPy) using the CFFI instead of ctypes . Based on http://harkablog.com/calling-rust-from-c-and-python.html (dead) which used ctypes CFFI is nice because:

- Reads C declarations (parses headers)
- Works in both CPython and PyPy (included with PyPy)

• Lower call overhead than ctypes from either of: brew install rust
• Multirust I recommend installing Rust via multirust so that you can compile projects that use unstable features (core) as well as testing for Rust 1.0,1.1, etc backwards compatibility. The per-directory override mechanism is especially nice. rustc treble.rs This will create a libtreble.dylib python test.py <cffi.api.FFILibrary_./libtreble.dylib object at 0x1089d5490> math from rust! 30