py2many: Python to many CLike languages transpiler


Python is popular, easy to program in, but has poor runtime performance. We can fix that by transpiling a subset of the language into a more performant, statically typed language.

A second benefit is security. Writing security sensitive code in a low level language like C is error prone and could lead to privilege escalation. Specialized languages such as wuffs exist to address this use case. py2many can be a more general purpose solution to the problem where you can verify the source via unit tests before you transpile.

A third potential use case is to accelerate python code by transpiling it into an extension

Swift and Kotlin dominate the mobile app development workflow. However, there is no one solution that works well for lower level libraries where there is desire to share code between platforms. Kotlin Mobile Multiplatform (KMM) is a player in this place, but it hasn't really caught on. py2many provides an alternative.

Lastly, it's a great educational tool to learn a new language by implementing a backend for your favorite language.


Rust is the language where the focus of development has been. C++14 is historically the first language to be supported.

Preliminary support exists for Julia, Kotlin, Nim, Go and Dart.


Based on Julian Konchunas' pyrs

Based on Lukas Martinelli Py14 ( and Py14/python-3 ( branch by Valentin Lorentz.


Original Python version.

def fib(i: int) -> int:
    if i == 0 or i == 1:
        return 1
    return fib(i - 1) + fib(i - 2)

Transpiled Rust code:

fn fib(i: i32) -> i32 {
    if i == 0 || i == 1 {
        return 1;
    return (fib((i - 1)) + fib((i - 2)));

Transpiled code for other languages: (fib*)

Trying it out


  • python 3
  • clang
  • rustc

Local installation:

./ install --user  # installs to $HOME/.local


sudo ./ install  # installs systemwide

Add the py2many script to your $PATH and run:


py2many --cpp=1 /tmp/
py2many --rust=1 /tmp/
py2many --julia=1 /tmp/
py2many --kotlin=1 /tmp/
py2many --nim=1 /tmp/
py2many --dart=1 /tmp/
py2many --go=1 /tmp/


clang fib.cpp