packaging issues with license-expression

[sebastianelsner]

Hello,

I am trying to upload execnet-2.1.1.tar.gz to our internal GitLab pypi mirror and am facing an issue with the current distribution when uploading with twine:

ERROR    InvalidDistribution: Invalid distribution metadata: license-expression 
         introduced in metadata version 2.4, not 2.3                            
Failed uploading ./package-index/execnet/execnet-2.1.1.tar.gz

As far as I understand the issue, your toml license line should be:

license = {file = "LICENSE"}

OR

license = {file = "LICENSE"}

OR update the release tools so the metadata is 2.4.

The same happened in the iniconfig package: pytest-dev/iniconfig#62
It was fixed by bumping hatchling: https://github.com/pytest-dev/iniconfig/pull/63/files

[sebastianelsner]

I was wondering what the policy for releases to pypi is. When do you think would this change make it there?

[nicoddemus]

We don't release often, so I will go ahead and make a new release soon.