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It's a topic close to my heart since that is one of the key thing that we solve in the OSS project windmill [1], letting users define simple single-file scripts in python/deno/go and handle the dependencies for them.
For deno, as the article point out, it's easy, deno has this feature baked in and we just have to deno run the scripts, similar for go where the imports are pretty much a fully qualified pointer to their source and version.
For python, we have to do a bit of machinery. For python we parse the AST, look at the imports, use the heuristics that most import name correspond to their pypi package (we maintain a also list of exception-mappings), pip-compile [2] all the imports, and then get a requirement file that we attach to the script, pip-install it before running the script (then we do a LOT of magic to cache the dependencies so one doesn't actually have to install them 99.9% of the time).
[1]: https://github.com/windmill-labs/windmill
I think they missed the best one: https://github.com/teaxyz/cli
It doesn't even need tea itself to run, it'll make a bash script that'll get it too if absent.
pipx might get this ability: https://github.com/pypa/pipx/pull/916
Shebang support with flakes: https://github.com/NixOS/nix/pull/5189
