upstream-dev failure when installing pandas

[keewis]

So after #4124 has been fixed upstream, we now have problems with installing numpy / pandas:

I'm not sure if I read the logs correctly, but it seems pandas (or the process to build their wheel, see their pyproject.toml) depends on numpy==1.15.4 which doesn't have a wheel for py38 and thus the source distribution is chosen. I'm not sure why the building the wheel from sdist doesn't work anymore, though.

For reference, see the logs of the last passing build.

[dcherian]

cc @TomAugspurger

[TomAugspurger]

@keewis not sure about the build issue, but we (along with many other projects) recently moved our wheels to upload to https://anaconda.org/scipy-wheels-nightly/. https://anaconda.org/scipy-wheels-nightly/pandas/ does have py38 wheels.

[TomAugspurger]

Ah, the (numpy) build failure is because pandas doesn't have a py38 entry in our pyproject.toml. Fixing that now.

edit: pandas-dev/pandas#34667. But you'll still want to update your CI at

xarray/ci/azure/install.yml

Line 16 in 2a288f6

-f https://7933911d6844c6c53a7d-47bd50c35cd79bd838daf386af554a83.ssl.cf2.rackcdn.com \

and

xarray/ci/azure/install.yml

Line 23 in 2a288f6

python -m pip install \

to pull from the new locations.