Add python 3.10 to CI

[Illviljan]

Waiting on

• conda package for python 3.10 support ContinuumIO/anaconda-issues#12669
• support python 3.10 conda/conda#10970
• Add workaround for https://github.com/conda/conda/issues/10969 conda-forge/python-feedstock#511
• Rebuild for python310 conda-forge/numba-feedstock#86
• Import ABC from collections.abc instead of collections for Python 3 compatibility pydap/pydap#210

• Closes #xxxx
• Tests added
• Passes pre-commit run --all-files
• User visible changes (including notable bug fixes) are documented in whats-new.rst
• New functions/methods are listed in api.rst

[github-actions]

Unit Test Results

         6 files           6 suites   55m 24s ⏱️
16 290 tests 14 522 ✔️ 1 768 💤 0 ❌
90 936 runs  82 551 ✔️ 8 385 💤 0 ❌

Results for commit 043b32a.

♻️ This comment has been updated with latest results.

[Illviljan]

Mamba seems to have troubles installing python 3.10 for some reason.
Maybe just waiting a little bit longer and letting the new version settle will do it?

[keewis]

Maybe just waiting a little bit longer and letting the new version settle will do it?

I guess so... when upgrading CI to 3.9 we had to wait pretty long until numba supported it, too (at least until February it was March), and I doubt they will be any quicker this time. We might be able to do a partial test (i.e. without installing numbagg), though.

[Illviljan]

Might be something else now then numbaagg. I think I turned off numbaagg now and i still got these cryptic errors:

  Looking for: ['python=3.10']
  
  Encountered problems while solving:
    - package python-3.10.0-h62f1059_0_cpython requires pip, but none of the providers can be installed
  
  pkgs/main/noarch          
  pkgs/r/linux-64           
  pkgs/r/noarch             
  pkgs/main/linux-64        
  conda-forge/noarch        
  conda-forge/linux-64     

[keewis]

that's to be expected, I guess, python=3.10 is still pretty new. In this case there's a bug in conda's parsing of python versions (it assumes single-digit minor versions) which somehow results in broken noarch packages. We'll probably have to wait until either python-feedstock merged a workaround or conda fixed the bug. Given that there's open PRs for both that should hopefully be soon.

[Illviljan]

Looking for: ['aiobotocore', 'boto3', 'bottleneck', 'cartopy', 'cdms2', 'cfgrib', 'cftime', 'dask', 'distributed', 'fsspec!=2021.7.0', 'h5netcdf', 'h5py', 'hdf5', 'hypothesis', 'iris', 'lxml', 'matplotlib-base', 'nc-time-axis', 'netcdf4', 'numba', 'numexpr', 'numpy', 'pandas', 'pint', 'pip', 'pooch', 'pre-commit', 'pseudonetcdf', 'pydap', 'pytest', 'pytest-cov', 'pytest-env', 'pytest-xdist', 'rasterio', 'scipy', 'seaborn', 'setuptools', 'sparse', 'toolz', 'typing_extensions', 'zarr']


Encountered problems while solving:
  - package rasterio-1.1.7-py39h645c05b_1 requires python >=3.9,<3.10.0a0, but none of the providers can be installed

rasterio doesn't allow 3.10?

[Illviljan]

Codecov seems to take a while:

   Codecov report uploader 0.1.15
[2022-01-19T21:20:41.230Z] ['info'] => Project root located at: /Users/runner/work/xarray/xarray
[2022-01-19T21:20:41.236Z] ['info'] -> No token specified or token is empty
[2022-01-19T21:20:41.246Z] ['info'] Searching for coverage files...
[2022-01-19T21:20:41.281Z] ['info'] => Found 1 possible coverage files:
  ./coverage.xml
[2022-01-19T21:20:41.282Z] ['info'] Processing ./coverage.xml...
[2022-01-19T21:20:41.294Z] ['info'] Detected GitHub Actions as the CI provider.
[2022-01-19T21:20:41.296Z] ['info'] Pinging Codecov: https://codecov.io/upload/v4?package=github-action-2.1.0-uploader-0.1.15&token=*******&branch=python310&build=1720207030&build_url=https%3A%2F%2Fgithub.jparrowsec.cn%2Fpydata%2Fxarray%2Factions%2Fruns%2F1720207030&commit=a4f32ed728765145eedf727c98a9e7aef26049c0&job=CI&pr=5844&service=github-actions&slug=pydata%2Fxarray&name=codecov-umbrella&tag=&flags=unittests&parent=
[2022-01-19T21:20:53.209Z] ['info'] Uploading...

How important is it?

[Illviljan]

I think this is ready now. Only had to temporarily comment out pydap until it supports 3.10.

[Illviljan]

Merging, thanks!