Pyodide 314.0: Python packages can now publish WebAssembly wheels to PyPI

6 comments

• simonw 1 hour ago
  I've been looking forward to this for ages!

  This means we can now take any C/Rust/whatever extension for Python, compile that as a `.wasm` extension, and then load it directly in browser Pyodide projects using:

    await micropip.install("package-on-pypi")
    import package_name
  

  Here's how to try the new feature out. Visit https://pyodide.org/en/stable/console.html and type:

    import micropip
    await micropip.install("pydantic_core")
    import pydantic_core
  

  That gets you this WASM wheel: https://pypi.org/project/pydantic_core/#pydantic_core-2.47.0...

  You can tell that it's got compiled code in (and not just Python) by running:

    pydantic_core._pydantic_core
  

  I get this:

    <module 'pydantic_core._pydantic_core' from '/lib/python3.14/site-packages/pydantic_core/_pydantic_core.cpython-314-wasm32-emscripten.so'>
• 12_throw_away 50 minutes ago
  Executing normal python programs inside a cpython vm inside a wasm context inside a javascript process inside a sandbox inside a browser is - genuinely - extremely exciting! (Might as well run the browser inside a container inside a VM while you're at it though.)
• wolfgangK 1 hour ago
  I presume this works (will work) also for JupyterLite that is based on Pyodide ? Would be great if it helped getting the latest OpenCV-python version [0] and it's dnn goodies being available on a zero-install client side Notebook !

  [0] https://news.ycombinator.com/item?id=48421858

  [-]
  • simonw 54 minutes ago
    Yeah it should definitely work there, anything you can `micropip.install()` into a Pyodide environment will work with JupyterLite.
• fzumstein 43 minutes ago
  Pyodide 314.0 is already available in xlwings Lite (the Python in Excel alternative you actually wanted).
• runningmike 1 hour ago
  Great news. And indeed a nice step to an even broader Python ecosystem.
• sgammon 41 minutes ago
  nice to see JS/python interop becoming a thing