python3.7-arm64 is not available

[jvesely]

Description:
Using default python-architecture for python 3.7

Action version:
v5

Platform:

• Ubuntu
• macOS
• Windows

Runner type:

• Hosted
• Self-hosted

Tools version:
python 3.7

Repro steps:
setup-python python-version: 3.7

Expected behavior:
python 3.7 installs and works

Actual behavior:

Run actions/setup-python@v5
  with:
    python-version: 3.7.16
    check-latest: false
    token: ***
    update-environment: true
    allow-prereleases: false
Installed versions
  Version 3.7.16 was not found in the local cache
  Error: The version '3.7.16' with architecture 'arm64' was not found for macOS 14.4.1.
  The list of all available versions can be found here: https://github.com/raw/actions/python-versions/main/versions-manifest.json

[shawnbrown]

I'm also seeing this (with python-version: 3.7):

Run actions/setup-python@v5
  with:
    python-version: 3.7
    cache: pip
    check-latest: false
    token: ***
    update-environment: true
    allow-prereleases: false
Installed versions
  Version 3.7 was not found in the local cache
  Error: The version '3.7' with architecture 'arm64' was not found for macOS 14.4.1.
  The list of all available versions can be found here: https://github.com/raw/actions/python-versions/main/versions-manifest.json

[woodruffw]

This is causing downstream breakage in some core Python dependencies: psf/cachecontrol#333

3.7 is technically EOL, but many core Python tools (like pip itself) have an compatibility policy that includes 3.7. As such, this should probably be supported on arm64 macOS runners until 3.7 is widely dropped (or at least from pip and its dependencies, like cachecontrol).

[aparnajyothi-y]

Hello @jvesely, Thank you for creating this issue and we will get back to you once we have some feedback on this :)

[mayeut]

If I'm not mistaken, Python 3.7 has never been supported on macOS arm64 and upstream support in CPython has only been added for 3.8+ (in 3.8.10 for the 3.8 branch).
It might be simpler to stick to macos-11/12/13 label if you want to test python<3.8

xref actions/runner-images#9770