And electricity and running water and oh the inconvenience. How is this worse than getting a script file that expects you to install modules?

If I download python project from someone on the same network as me and they have it written in a different python version to me and a requirements.txt I need all those things anyway.

You can constrain Python version: https://peps.python.org/pep-0723/#:~:text=requires-python

I mean, if you use == constraints instead of >= you can avoid getting different versions, and if you’ve used it (or other things which combined have a superset of the requirements) you might have everything locally in your uv cache, too.

But, yes, python scripts with in-script dependencies plus uv to run them doesn't change dependency distribution, just streamlines use compared to manual setup of a venv per script.

You can specify python version requirements in the comment, as the standard describes