testing failure on python3.8

our CI tests fail on 3.8 because a dependency conflict causes the conda solver to churn forever. Nothing in our dependencies suggests an obvious potential conflict with 3.8–except region.

Looking a bit closer at region’s reqs, it specifies sklearn instead of scikit-learn, which is a deprecated alias. I’m guessing that’s the culprit. I’m not sure the best way to resolve this. We’re not planning to release spopt for awhile, and we’ve decided not to do any more releases of region (though this would be a very quick and easy change). What do you think @sjsrey?

[knaaptime]

resolved thanks to some fantastic help from @marcelotrevisani

[knaaptime]

if you try to install region in an empty 3.8 envirionment you get

test38 ❯ conda install region
Collecting package metadata (current_repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.
Solving environment: failed with repodata from current_repodata.json, will retry with next repodata source.
Collecting package metadata (repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.
Solving environment: -
Found conflicts! Looking for incompatible packages.
This can take several minutes.  Press CTRL-C to abort.
failed

UnsatisfiableError: The following specifications were found to be incompatible with each other:

Output in format: Requested package -> Available versions
Note that strict channel priority may have removed packages required for satisfiability.

so i’m fairly confident this is the root of the problem