[adamckay]

This will be useful, and definitely handy when sharing random scripts with a defined structure for its requirements. I've struggled to give scripts to non-developers to run recently and between getting them to configure a virtualenv and install dependencies by hand to using `pipx` it's been a pain so hopefully this will alleviate some if it in the future.

Not sure, however, that I buy the argument that it's going to be simpler for non-programmers to use TOML embedded inside a multiline string versus using something along the lines of requirements.txt - there's going to be absolutely zero syntax highlighting so things like missing quotes or bracket's will need to be carefully identified.

There's also going to be inevitable differences between `__pyproject__` and `pyproject.toml` which could lead to more confusion, such as the `readme` key - that's likely to be useful to include some help information alongside your script so it's self documenting, but in `pyproject.toml` it must refer to another file and in `__pyproject__` I'd assume it can itself be a multiline string..?