`python-version-file` does not support multiple versions

[sdimovv]

Description: It is possible to specify multiple python versions like so:

- uses: actions/setup-python@v5
  with:
    python-version: |
      3.8
      3.9
      3.10

However, specifying them like so breaks CI:

.python-version:

3.8
3.9
3.10

- uses: actions/setup-python@v5
   with:
     python-version-file: '.python-version'

Action version: 5

Platform:

• [x] Ubuntu
• [x] macOS
• [x] Windows

Runner type:

• [x] Hosted
• [x] Self-hosted

Tools version:

Repro steps:
See description

Expected behavior: Multiple python versions can be read from .python-version

Actual behavior: Multiple python versions cannot be read from .python-version

[aparnajyothi-y]

Hello @sdimovv, Thank you for creating this issue and we will look into it :)

[aparnajyothi-y]

Hello @sdimovv, Thank you once again for creating this issue and as per the current implementation, the actions/setup-python action does not support reading multiple Python versions from a .python-version file. Instead, we should specify multiple versions directly in the yaml configuration under the python-version parameter like below as per this documentation.

• uses: actions/setup-python@v5 with: python-version: | 3.8 3.9 3.10

  Adding support to list multiple versions from a python-version-file that is expecting from this issue can be implemented as a feature request.