The action fails if the .python-version (passed into python-version-file input) contains a comment

[nitrocode]

Description:
The workflow

      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version-file: '.python-version'

The .python-version file

# This file is read by the terraform if var.runtime is unset
3.11

The error

  Version # This file is read by the terraform if var.runtime is unset
  3.11 was not found in the local cache
  Error: The version '# This file is read by the terraform if var.runtime is unset
  3.11' with architecture 'x64' was not found for Ubuntu 22.04.
  The list of all available versions can be found here: https://raw.githubusercontent.com/actions/python-versions/main/versions-manifest.json

Action version:
Latest v5

Platform:

• Ubuntu
• macOS
• Windows

Runner type:

• Hosted
• Self-hosted

Tools version:

Repro steps:
See above

Expected behavior:
Ignores the comments and only grabs the version

Actual behavior:
It doesn't ignore the comments

[priya-kinthali]

Hello @nitrocode 👋,
Thank you for reporting this issue. We will investigate it and get back to you as soon as we have some feedback.

[olivierlefloch]

The same issue occurs if multiple versions of python are specified in the .python-version file.

[priya-kinthali]

Hello 👋,
@nitrocode , The setup-python action does not currently support comments within the .python-version file, which is causing the error you encountered. We appreciate you bringing this to our attention and will consider incorporating comment support in future enhancements. In the meantime, please ensure that the .python-version file contains only the version number without any comments.
@olivierlefloch , Regarding specifying multiple versions in the .python-version file, there is an existing feature request to support listing multiple versions. We will consider this for future updates.

Thank you both for your inputs and helping us improve the setup-python action!