There are already several different language implementations of the Python runtime, and some of them support WebAssembly. This document will describe how to run RustPython on WasmEdge to execute Python programs.

Compile RustPython

To compile RustPython, you should have the Rust toolchain installed on your machine. And wasm32-wasi platform support should be enabled.

rustup target add wasm32-wasi

Then you could use the following command to clone and compile RustPython:

git clone
cd RustPython
cargo build --release --target wasm32-wasi --features="freeze-stdlib"

freeze-stdlib feature is enabled for including Python standard library inside the binary file. The output file should be able at target/wasm32-wasi/release/rustpython.wasm.

AOT Compile

WasmEdge supports compiling WebAssembly bytecode programs into native machine code for better performance. It is highly recommended to compile the RustPython to native machine code before running.

wasmedgec ./target/wasm32-wasi/release/rustpython.wasm ./target/wasm32-wasi/release/rustpython.wasm


wasmedge ./target/wasm32-wasi/release/rustpython.wasm

Then you could get a Python shell in WebAssembly!

Grant file system access

You can pre-open directories to let WASI programs have permission to read and write files stored on the real machine. The following command mounted the current working directory to the WASI virtual file system.

wasmedge --dir .:. ./target/wasm32-wasi/release/rustpython.wasm