python-wasm

python-wasm: WebAssembly CPython for Node.js and the browser

See the main repo for more information.

Using from node.js

Install the package:

npm install python-wasm

The library should work with nodejs version 16.x on Linux, MacOS, and native Microsoft Windows. (NOTE: for node 14, use the --experimental-wasm-bigint flag.)

wstein@max % node
Welcome to Node.js v16.13.0.
Type ".help" for more information.
> python = require('python-wasm')
> await python.init()
> python.exec('a = sum(range(101)); a')    # outputs to stdout
5050
> s = python.repr('a'); s # javascript string
5050
> python.exec('import sys; sys.version')
'3.11.0b3 (main, Jul  8 2022, 23:21:07) [Clang 13.0.1 ([e-mail]:ziglang/zig-bootstrap.git 81f0e6c5b902ead84753490d'
> python.repr('sys.platform')
'wasi'

Using in a web application

See this repo for how to use Webpack5 with python-wasm.

API

The python-wasm module exports four things:

• init - async function; call to ensure WASM code has been initialized
• exec(code:string) - execute code (output goes to /dev/stdout and /dev/stderr)
• repr(expr:string) - return representation of an expression as a string
• wasm - object that is defined after await init() succeeds.
  • wasm.fs - the memfs filesystem