uv ignores python_version marker when conjoined with platform markers

[edgarrmondragon]

For example, SQLAlchemy 2.0.32 has a dependency on greenlet, marked for certain platforms and only for Python < 3.13¹:

greenlet != 0.4.17;(python_version<"3.13" and (platform_machine=='aarch64' or (platform_machine=='ppc64le' or (platform_machine=='x86_64' or (platform_machine=='amd64' or (platform_machine=='AMD64' or (platform_machine=='win32' or platform_machine=='WIN32')))))))

Now, something changed in uv 0.2.37 that the python_version marker is ignored. For example:

# requirements.txt
sqlalchemy==2.0.32

With uv 0.2.36

$ UV_NO_CACHE=1 [email protected] pip compile --python python3.13 --python-platform x86_64-manylinux_2_31 requirements.txt
Resolved 2 packages in 1.16s
# This file was autogenerated by uv via the following command:
#    uv pip compile --python python3.13 --python-platform x86_64-manylinux_2_31 requirements.txt
sqlalchemy==2.0.32
    # via -r requirements.txt
typing-extensions==4.12.2
    # via sqlalchemy

but with uv 0.2.37

$ UV_NO_CACHE=1 [email protected] pip compile --python python3.13 --python-platform x86_64-manylinux_2_31 requirements.txt
Resolved 3 packages in 1.16s
# This file was autogenerated by uv via the following command:
#    uv pip compile --python python3.13 --python-platform x86_64-manylinux_2_31 requirements.txt
greenlet==3.0.3
    # via sqlalchemy
sqlalchemy==2.0.32
    # via -r requirements.txt
typing-extensions==4.12.2
    # via sqlalchemy

When the platform is not one of those in the markers, the dependency is correctly excluded:

$ UV_NO_CACHE=1 [email protected] pip compile --python python3.13 --python-platform aarch64-apple-darwin requirements.txt
Resolved 2 packages in 1.17s
# This file was autogenerated by uv via the following command:
#    uv pip compile --python python3.13 --python-platform aarch64-apple-darwin requirements.txt
sqlalchemy==2.0.32
    # via -r requirements.txt
typing-extensions==4.12.2
    # via sqlalchemy

Maybe related:

• uv misinterprets python_version in "2.6 2.7 3.2 3.3" marker #6168

Footnotes

1. https://github.com/sqlalchemy/sqlalchemy/blob/62c242b78dee306738a2cd22f548679e9818a1ac/setup.cfg#L41 ↩

[charliermarsh]

Interesting, thanks.

[charliermarsh]

I’ll try to take a look at this today.

[charliermarsh]

I have at least one idea of what’s going on here.

[charliermarsh]

Ah ok I see the issue.

[charliermarsh]

(It's unique to 3.13, since only pre-releases are available, and it relates to a mishandling of pre-releases there. Will fix.)

[edgarrmondragon]

Thanks @charliermarsh!

[charliermarsh]

Thanks for reporting!