When upgrading dynamic versioning gets installed version number

[dkav]

I am hoping someone could help me resolve this issue.

When upgrading rpy2 from 3.5.6 to 3.5.7 I got the following message:

Discarding https://files.pythonhosted.org/packages/8b/39/4a9d9e59ba062f156a642af7271bed418584406a6e65c3a23d1ded8c4a77/rpy2-3.5.7.tar.gz (from https://pypi.org/simple/rpy2/) (requires-python:>=3.7): Requested rpy2 from https://files.pythonhosted.org/packages/8b/39/4a9d9e59ba062f156a642af7271bed418584406a6e65c3a23d1ded8c4a77/rpy2-3.5.7.tar.gz has inconsistent version: expected '3.5.7', but metadata has '3.5.6'

Some relevant details:

• Version 3.5.6 has a compatible wheel for my Mac but for 3.5.7 pip has to build the wheel
• I am using Homebrew with Python 3.10 and pip 23.0
• Version number is defined in ___init__.py as:

__version_vector__ = (3, 5, 8)

__version__ = '.'.join(str(x) for x in __version_vector__)

• Dynamic versioning is defined in pyproject.toml as:

[project]
dynamic = ["version"]

[tool.setuptools.dynamic]
version = { attr = "rpy2.__version__" }

From testing I found that:

• The dynamic version number defined in pyproject.toml is coming from the existing install and not from the new package
• Installing locally does not fail but it upgrades without changing the version number (3.5.6 --> 3.5.6)
• If I hardcode the version in pyproject.toml the upgrade installs correctly

Is this a bug, a path issue, or something else?

More info at rpy2/rpy2#984