Support Python private packages

[pombredanne]

See:

• Add docs for the uv build backend astral-sh/uv#7976 (comment)
  from @chrisrodrigue

"Private :: Do Not Upload" is a handy classifier which causes PyPI to reject a package. It's handy for packages that you don't want to accidentally publish, so maybe it could be used in the full example?

[stefan6419846]

Just for the record: The original upstream docs for this are at https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#classifiers

[AyanSinhaMahapatra]

From the docs:

To prevent a package from being uploaded to PyPI, use the special Private :: Do Not Upload classifier. PyPI will always reject packages with classifiers beginning with Private ::.

We want to use the is_private flag set for python packages which has a classifier containing Private ::
Examples: https://github.com/search?q=%22Private+%3A%3A%22+path%3A**%2Fpyproject.toml+&type=code&ref=advsearch

[dhruv-k1]

Hi, can I work on this issue?

[Dhruv276R]

@pombredanne Is this issue open? If not can you elaborate?

[Avan2021]

@pombredanne I would like to work on this issue. Please provide some more detail and hopefully assign it as well.

[tanishapritha]

Hey! Is this issue still open? Would like to wok on it.