[MRG] Update to JupyterLab 4 by jtpio · Pull Request #1340 · jupyterhub/repo2docker (original) (raw)

How does this affect repos that specify python 3.7?

They are unaffected at the moment. As this PR stands, 3.7 stops getting updates, but continues to be supported for the server environment.

The next stage of reduced support is bumping kernel_env_cutoff_version to 3.8, at which point 3.7 becomes a 'kernel-only' version, like 3.6 and older. I think would be reasonable to make this change here as well, but not required.

Pro bumping kernel_env_cutoff:

• all installs get the same jupyterlab/server versions
• we will need to make this transition eventually, when e.g. a security requirement requires bumping a no-longer-supported package

Con:

• bigger, more disruptive change for 3.7-using repos

Since there is no visible effect on 3.7 repos, I think it's fine to merge this as-is.