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You'll need the latest wasmer RC for proper exceptions support. We unfortunately didn't get the final release out quite in time... curl https://get.wasmer

You'll need the latest wasmer RC for proper exceptions support. We unfortunately didn't get the final release out quite in time... curl https://get.wasmer.io -sSfL | sh -s "v6.1.0-rc.5" wasmer run python/python

simonw 1y ago
How long should it take for "wasmer run python/python" to start showing me output? It's been hung for a while for me now (I upgraded to wasmer 6.1.0-rc.5). "wasmer run python/python@=0.2.0" on the same machine gets me into Python 3.12.0 almost instantly.
- the_duke 1y ago
  Compilation with LLVM takes quite a while (the final release will show a spinner...). So please wait a bit - subsequent runs will be fast, since compiled Python will be cached.
  - simonw 1y ago
    Oh so it's actually compiling everything on my machine? Any chance `wasmer run python/python` might download a pre-compiled version in the future?
    - the_duke 1y ago
      Yeah, that's mentioned as a small side note in the blog post - we are working on it, and will hopefully have it ready in a week or two!
      - simonw 1y ago
        OK got there in the end! I didn't time it but felt like around 10 minutes or more. It did give me one warning message: % wasmer run python/python Python 3.13.0rc2 (heads/feat/dl-dirty:152184da8f, Aug 28 2025, 23:40:30) [Clang 21.1.0-rc2 (git@github.com:wasix-org/llvm-project.git 70df5e11515124124a4 on wasix Type "help", "copyright", "credits" or "license" for more information. warning: can't use pyrepl: No module named 'msvcrt' >>>
        shakna 1y ago
        That sounds like the compilation is accidentally triggering this old frustration [0]. [0] https://github.com/python/cpython/issues/131189 https://github.com/python/cpython/issues/131189
        behnamoh 1y ago
        Compilation was slow for me on macOS too.
        syrusakbary 1y ago
        We'll improve this very soon, right now the experience is less than ideal. Ideally we would download the compiled artifacts instead of compiling as Simon commented... it will be a much better experience for everyone!
        hoodchatham 1y ago
        It says the same thing in the pyodide repl for what it's worth.

simonw 1y ago

How long should it take for "wasmer run python/python" to start showing me output? It's been hung for a while for me now (I upgraded to wasmer 6.1.0-rc.5). "wasmer run python/python@=0.2.0" on the same machine gets me into Python 3.12.0 almost instantly.

the_duke 1y ago
Compilation with LLVM takes quite a while (the final release will show a spinner...). So please wait a bit - subsequent runs will be fast, since compiled Python will be cached.
- simonw 1y ago
  Oh so it's actually compiling everything on my machine? Any chance `wasmer run python/python` might download a pre-compiled version in the future?
  - the_duke 1y ago
    Yeah, that's mentioned as a small side note in the blog post - we are working on it, and will hopefully have it ready in a week or two!
    - simonw 1y ago
      OK got there in the end! I didn't time it but felt like around 10 minutes or more. It did give me one warning message: % wasmer run python/python Python 3.13.0rc2 (heads/feat/dl-dirty:152184da8f, Aug 28 2025, 23:40:30) [Clang 21.1.0-rc2 (git@github.com:wasix-org/llvm-project.git 70df5e11515124124a4 on wasix Type "help", "copyright", "credits" or "license" for more information. warning: can't use pyrepl: No module named 'msvcrt' >>>
      - shakna 1y ago
        That sounds like the compilation is accidentally triggering this old frustration [0]. [0] https://github.com/python/cpython/issues/131189 https://github.com/python/cpython/issues/131189
        behnamoh 1y ago
        Compilation was slow for me on macOS too.
        syrusakbary 1y ago
        We'll improve this very soon, right now the experience is less than ideal. Ideally we would download the compiled artifacts instead of compiling as Simon commented... it will be a much better experience for everyone!
      - hoodchatham 1y ago
        It says the same thing in the pyodide repl for what it's worth.