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Automatic FFI generation for Python <-> Rust interfacing.

Project description

RustyPy is a code generator for generating binding functions between Rust and Python files. In addition it provides a series of types for interfacing from Python with Rust, with automatic type conversion handling for primitives and other basic types (like vectors, hash maps and tuples) and an API for working with those (both from Rust and Python).


  • Generate bindings in Rust targetting Python functions.

  • Generate bindings in Python targetting Rust functions.

  • Provides types for interfacing between Rust and Python.


To install RustyPy just use pip:

pip install rustypy

RustyPy requires Python 3.5 or more and works with Rust stable.

To target Python from Rust the package cpython is required to initialize the package.



RustyPy includes a command line interface to generate the code, which you can embeed in your build chain if it’s necessary.

Generate Python bindings in Rust

You can execute the script writing:

$rustypy -h


$python -m rustypy -h

make sure that rustypy is in your current Python path. The help command has all the information to generate bindings succesfully.

It also includes functions to generate bindings dynamically. In Python use:

from rustypy.pywrapper import bind_py_pckg_funcs
# default prefix is "rust_bind_"
optional = ["my_bind_prefix_", "other_prefix_"]

This function will generate the bindings for the package from which is called from (so the package must be initiated placing an file in one of the parents folders).

More info: Python in Rust

Generate Rust bindings in Python

Due to the nature of Python this is done dynamically, so no files are generated and the bindings are wrapped appropriately with their own callables from Python.

from rustypy.rswrapper import bind_rs_crate_funcs

source_path = "/home/user/workspace/rs_test_lib"
compiled_lib = "/home/user/workspace/rs_test_lib/target/debug/"

# default prefix is "python_bind_"
optional = ["my_bind_prefix_", "other_prefix_"]
lib_binds = bind_rs_crate_funcs(source_path, compiled_lib, prefixes=optional)

lib_binds.my_bind_prefix__ffi_function("Hello from Python!")

There is no concept of ‘module’ in C (which is the language used for interfacing) so the functions cannot be namedspaced as you would in pure Rust. Read about Rust FFI in the book.

More info: Rust in Python.

Rust crate documentation.

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