Confused about python version enforcement in sandbox

Question

➜ ~/projects/nbs git:(lcr-mer-772) ✗ VPN ✓
$ head -n 2 zon.py 16:21:45
# /// script
# requires-python = ">=3.11"
➜ ~/projects/nbs git:(lcr-mer-772) ✗ VPN ✓
$ uv run marimo run --sandbox zon.py 16:21:47
warning: No `requires-python` value found in the workspace. Defaulting to `>=3.12`.I am a bit confused at this warning message, I have defined a valid requires-python attribute yet this is happening. On another front, is it incorrect to use sandboxes the way I am doing it? i.e. using uv run before the marimo call?

Myles Scolnick · Answer

this warning might be coming from uv itself and not marimo. do you have a pyproject.toml? you might need to add requires-python

lucharo · Answer

Ah I see, in this case I don't have a pyproject.toml, I'm just running uv/marimo in a standalone folder (I simply have one marimo file with its sandboxed requirements), but it's a bit confusing regarding what python verxion/executable is actually being used in this case

lucharo · Answer

In the same vein of confusion, how is best to add marimo extra dependencies to a sandboxed notebook? Should we just add duckdb rather than marimo[sql]?

lucharo · Answer

➜ ~/nbs git:(lcr-mer-772) ✗ VPN ✓
$ uvx marimo edit --sandbox zon.py Running in a sandbox: uv run --isolated --no-project --with-requirements /var/folders/kt/5fbzpd0j197d08q5bbft193m0000gn/T/tmp_amqiijn.txt --python >=3.11 marimo edit zon.py × No solution found when resolving `--with` dependencies: ╰─▶ Because you require marimo==0.10.9 and marimo==0.10.12, we can conclude that your requirements are unsatisfiable.

Myles Scolnick · Answer

this is a bug on our end. but yea adding duckdb and polars to the top header is recommended for now. ill fix this

Myles Scolnick · Answer

i have a fixe here: https://github.com/marimo-team/marimo/pull/3425

lucharo · Answer

That was so quick!! Thanks

lucharo · Answer

I added a comment of a potential edge case

lucharo · Answer

@Myles Scolnick in this case, if I have marimo as an inline dependency and I run uvx marimo edit --sandbox nb.py which marimo installation will uv use? It would be whatever is available to the environment that uv has access to, right? not the one in the sandbox? the user will always need marimo installed in the environment that uv runs prior to running the sandbox?

Myles Scolnick · Answer

we will use the marimo version that was used to invoke marimo edit --sandbox

Myles Scolnick · Answer

so if you do uvx marimo, uvx might cache what is has download or use the latest if its not found

lucharo · Answer

Ok good to know!!

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Confused about python version enforcement in sandbox