wasm export local file read

Question

exporting notebook to wasm$ uv tool run marimo@0.10.2 export html-wasm apps.py -o wasm --mode run serve it on python http server, after loading the index file, caught This cell raised an exception: FileNotFoundError('[Errno 44] No such file or directory: 'data.csv'' does wasm export support reading local file?

Myles Scolnick · Answer

It does not at the moment. We have an issue internally tracking this

Myles Scolnick · Answer

Is difficult since we would need to bundle this

Myles Scolnick · Answer

And there is a limit of what wasm can support in terms of file size

lovuikeng · Answer

ok, just to confirm, thank you, wasm standalone looks really great feature to explore 🙂

mcaggio · Answer

not sure if I understood the question correctly, but if you want to make a file available to the pyodide kernel, provided the file is available for download from a url, you can download it to the local wasm kernel filesystemfrom pyodide.http import pyfetch response = await pyfetch("https://raw.githubusercontent.com/caggionim/marimo_rheofit/refs/heads/main/models.py")
with open('models.py', 'wb') as file: file.write(await response.bytes())

mcaggio · Answer

I have an example in this repository https://github.com/caggionim/marimo_rheofit

lovuikeng · Answer

thanks, true that reading CSV from URL does work, the intention here is to read from local file path

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wasm export local file read