run CI on python=3.12 (#8605)

* enable a special 3.12 ci job

* add the special environment files

* update the trove classifiers

* remove `pint` from the 3.12 environment

The reason is that `pint` currently does not explicitly define
`dtype`, causing our runtime checkable protocols not to match.

.github/workflows/ci.yaml

@@ -44,7 +44,7 @@ jobs:
       matrix:
         os: ["ubuntu-latest", "macos-latest", "windows-latest"]
         # Bookend python versions
-        python-version: ["3.9", "3.11"]
+        python-version: ["3.9", "3.11", "3.12"]
         env: [""]
         include:
           # Minimum python version:
@@ -71,7 +71,11 @@ jobs:
 
           if [[ ${{ matrix.os }} == windows* ]] ;
           then
-            echo "CONDA_ENV_FILE=ci/requirements/environment-windows.yml" >> $GITHUB_ENV
+            if [[ ${{ matrix.python-version }} != "3.12" ]]; then
+              echo "CONDA_ENV_FILE=ci/requirements/environment-windows.yml" >> $GITHUB_ENV
+            else
+              echo "CONDA_ENV_FILE=ci/requirements/environment-windows-3.12.yml" >> $GITHUB_ENV
+            fi
           elif [[ "${{ matrix.env }}" != "" ]] ;
           then
             if [[ "${{ matrix.env }}" == "flaky" ]] ;
@@ -82,7 +86,11 @@ jobs:
               echo "CONDA_ENV_FILE=ci/requirements/${{ matrix.env }}.yml" >> $GITHUB_ENV
             fi
           else
-            echo "CONDA_ENV_FILE=ci/requirements/environment.yml" >> $GITHUB_ENV
+            if [[ ${{ matrix.python-version }} != "3.12" ]]; then
+              echo "CONDA_ENV_FILE=ci/requirements/environment.yml" >> $GITHUB_ENV
+            else
+              echo "CONDA_ENV_FILE=ci/requirements/environment-3.12.yml" >> $GITHUB_ENV
+            fi
           fi
 
           echo "PYTHON_VERSION=${{ matrix.python-version }}" >> $GITHUB_ENV

ci/requirements/environment-3.12.yml

@@ -0,0 +1,47 @@
+name: xarray-tests
+channels:
+  - conda-forge
+  - nodefaults
+dependencies:
+  - aiobotocore
+  - boto3
+  - bottleneck
+  - cartopy
+  - cftime
+  - dask-core
+  - distributed
+  - flox
+  - fsspec!=2021.7.0
+  - h5netcdf
+  - h5py
+  - hdf5
+  - hypothesis
+  - iris
+  - lxml  # Optional dep of pydap
+  - matplotlib-base
+  - nc-time-axis
+  - netcdf4
+  # - numba
+  # - numbagg
+  - numexpr
+  - numpy
+  - opt_einsum
+  - packaging
+  - pandas
+  # - pint>=0.22
+  - pip
+  - pooch
+  - pre-commit
+  - pydap
+  - pytest
+  - pytest-cov
+  - pytest-env
+  - pytest-xdist
+  - pytest-timeout
+  - rasterio
+  - scipy
+  - seaborn
+  # - sparse
+  - toolz
+  - typing_extensions
+  - zarr

ci/requirements/environment-windows-3.12.yml

@@ -0,0 +1,42 @@
+name: xarray-tests
+channels:
+  - conda-forge
+dependencies:
+  - boto3
+  - bottleneck
+  - cartopy
+  - cftime
+  - dask-core
+  - distributed
+  - flox
+  - fsspec!=2021.7.0
+  - h5netcdf
+  - h5py
+  - hdf5
+  - hypothesis
+  - iris
+  - lxml  # Optional dep of pydap
+  - matplotlib-base
+  - nc-time-axis
+  - netcdf4
+  # - numba
+  # - numbagg
+  - numpy
+  - packaging
+  - pandas
+  # - pint>=0.22
+  - pip
+  - pre-commit
+  - pydap
+  - pytest
+  - pytest-cov
+  - pytest-env
+  - pytest-xdist
+  - pytest-timeout
+  - rasterio
+  - scipy
+  - seaborn
+  # - sparse
+  - toolz
+  - typing_extensions
+  - zarr

pyproject.toml

@@ -12,6 +12,7 @@ classifiers = [
   "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
+  "Programming Language :: Python :: 3.12",
   "Topic :: Scientific/Engineering",
 ]
 description = "N-D labeled arrays and datasets in Python"