Python version 3.13 on linux-64 is not supported!

[rgaiacs]

Python 3.13 was first released on 07 October 2024, almost a full year ago and conda-forge offers Python 3.13, see https://github.com/conda-forge/python-feedstock.

Bug description

A Git repository that has runtime.txt containing

python-3.13

will fail to be converted to a Docker image.

Expected behaviour

A Docker image to be created.

Actual behaviour

  File "/home/raniere/github.com/jupyterhub/repo2docker/repo2docker/buildpacks/conda/__init__.py", line 215, in get_build_script_files
    raise ValueError(
        f"Python version {server_py_version} on {conda_platform} is not supported!"
    )
ValueError: Python version 3.13 on linux-64 is not supported!

[matthewfeickert]

This is also hitting pyhf after scikit-hep/pyhf#2621.

[matthewfeickert]

@rgaiacs Can you comment a bit on how PR #1447 affects this issue, given that it added a buildpacks/conda/environment.py-3.13.yml file but not a buildpacks/conda/environment.py-3.13-linux-64.lock?

[rgaiacs]

Hi @matthewfeickert, thanks for the message.

In pull request #1447, I run freeze.py. I will have to look at why the file was not created.

[rgaiacs]

Hi @matthewfeickert, thanks again for the message. #1476 should fix the problem. If you continue encountering problems, open a new issue and I will follow-up.

I'm closing this issue as support for Python 3.13 was implemented in #1447 and #1476.

[matthewfeickert]

Thanks @rgaiacs. As PR #1447 went in after the August 2025 release would it be possible to get an October or November 2025 release so that Binder instances would be able to pick this up?

[rgaiacs]

would it be possible to get an October or November 2025

I added your request to the next JupyterHub Collab Cafe.