Add support for Python=3.11

[valeriupredoi]

Add support for Python 3.11

Add support for Python 3.11 by updating pins and changing the documentation theme to a more modern theme that supports Python 3.11.

History

This is THERE NOW 😁

This is the sister PR of Core's ESMValGroup/ESMValCore#1832 which that works fine.

All needed tasks are now completed! As for testing - all goes fine, including

• dev installation with esmvalcore=2.8.1rc1
• a full development installation with current dev Core

Strategy

This needs be discussed: currently this works fine with esmvalcore=2.8.1rc1 but as the name of the package suggests, it's a very RC of a bugfix release that's not there yet; pending @remi-kazeroni 's testing we may release a Core bugfix release; regardless of that, @ESMValGroup/technical-lead-development-team I suppose Tool with Py311 support will only beavailable at 2.9 release point right? Please comment below about this. If that's the case then I'll have to keep maintaining this by running periodical GA tests see anything breaks the show in the meantime. -> result of discussion: esmvalcore v2.8.1 has been released ESMValGroup/ESMValCore#2081.

Steps undertaken to make the blithering thing work (historical stuff)

• psy-reg needs to be built for Python=3.11 - there is already a bot PR on this Rebuild for python311 conda-forge/psy-reg-feedstock#16 done nicely by @Chilipp - thank you!
• not affecting us much and nicely documented by @zklaus in Core: same issue with sphinx as detailed in [Python] Add support for Python=3.11 ESMValCore#1832 so currently we need to unpin it

That's it! env for Python=311 building nicely, bar, of course, esmvalcore that needs a conda rebuild/release - we have core=2.8.1rc1 and env builds well, @remi-kazeroni is currently running recipe tests too, with it. As of now (22 May 2023) there are a couple issues from CI:

• xesmf is pinned to ancient and barfs with the ne ESMF->esmpy type of import shoutout to @zklaus who fixe-ed this 🍺 xesmf=0.7.1 now be in the environment, and good things happen

Now, couple more issues:

• docs fail to build on Readthedocs bc of that ESMFMKFILE missing var, we shall plug @zklaus 's magic from Core Klaus Magic working well!
• ESMF -> esmpy imports fixed in Update esmpy import for ESMF version 8.4.0 or larger #3188 now merged

As of May 23rd, 2023: all systems are go!

Still to do: get all the CI workflows to run Python=3.11

[bouweandela]

The installation is failing now because it picks up ESMValCore v2.7.1 instead of v2.8.

[valeriupredoi]

Well, we've not rebuilt and deployed Core yet, the solver is a bit confused, will take it from here, now that that psy pkg is rebuilt for 3.11

[bouweandela]

Comment by @zklaus

In ESMValCore v2.8 setup.py we have a pin on esmpy<8.4, but that is not available for Python 3.11. From 8.4.2 onward, esmpy is noarch.

[valeriupredoi]

yes, that's why I'll go straight to Core feedstock and get us a build=1 done with the new pins, that will allow the installation of new 311-fangled deps 👍

[valeriupredoi]

@bouweandela @remi-kazeroni @zklaus we are well and truly in Python=3.11 business, gents 🐍 😁

[valeriupredoi]

woohoo, progressumpossum! Cheers @bouweandela 🍻