PyPI no longer reports the license for this package

[toby-coleman]

Since the 2026.7.0 release PyPI no longer reports the license for this project.

• 2026.7.0 currently shows no license
• 2026.6.0 shows BSD-3-Clause.

This is causing the license check in my project to fail using the LicenseCheck tool.

[martindurant]

cc @Yonghui-Lee

[toby-coleman]

For what it is worth, AI analysis reports this could happen if the wheel was uploaded to PyPI with an older twine<6.1.0 version, but am not familiar with the release process so I can't say if this is correct.

[Yonghui-Lee]

2026.7.0 was uploaded via the upload endpoint. The 2026.7.0 wheel and sdist files both contain the correct license expression (License-Expression: BSD-3-Clause under Core Metadata 2.4).

I also suspected that the upload tool lacked Metadata 2.4 support(e.g., older twine) and did not transmit the license_expression field to PyPI during the upload request.

[martindurant]

So you think it's the combination of new metadata fields with old twine?

[Yonghui-Lee]

So you think it's the combination of new metadata fields with old twine?

Yes. It would be great if we can check the tool version. And I think using the automated release workflow can also avoid this.