Add xarray dependencies for doctest

Author: thodson-usgs

.github/workflows/ci-linux.yaml

@@ -50,7 +50,7 @@ jobs:
         run: |
           conda activate env
           export DISABLE_NUMCODECS_AVX2=""
-          python -m pip install -v -e .[test,test_extras,msgpack,zfpy,pcodec]
+          python -m pip install -v -e .[test,test_extras,doctest,msgpack,zfpy,pcodec]
 
       - name: List installed packages
         shell: "bash -l {0}"

.github/workflows/ci-osx.yaml

@@ -50,7 +50,7 @@ jobs:
         run: |
           conda activate env
           export DISABLE_NUMCODECS_AVX2=""
-          python -m pip install -v -e .[test,test_extras,msgpack,zfpy,pcodec]
+          python -m pip install -v -e .[test,test_extras,doctest,msgpack,zfpy,pcodec]
 
       - name: List installed packages
         shell: "bash -l {0}"

.github/workflows/ci-windows.yaml

@@ -42,7 +42,7 @@ jobs:
         shell: "bash -l {0}"
         run: |
           conda activate env
-          python -m pip install -v -e .[test,test_extras,msgpack,zfpy,pcodec]
+          python -m pip install -v -e .[test,test_extras,doctest,msgpack,zfpy,pcodec]
 
       - name: List installed packages
         shell: "bash -l {0}"

numcodecs/bitinfo.py

@@ -33,16 +33,20 @@ class BitInfo(BitRound):
 
     Examples
     --------
+    This example applies the BitInfo codec to an xarray dataset and
+    writes the data out using xarray's `to_zarr` method. Using this pattern, the
+    information content is computed chunkwise, which is recommended for
+    datasets with variable information content. Note that these data have
+    been quantized creating erroneous results, which is apparent in
+    the output. Do not use with quantized data in practice.
+
     >>> import xarray as xr
     >>> ds = xr.tutorial.open_dataset("air_temperature")
-    >>> # Note these data have already undergone lossy compression,
-    >>> # which should not be combined with bitinformation in practice
-
     >>> from numcodecs import Blosc, BitInfo
     >>> compressor = Blosc(cname="zstd", clevel=3)
     >>> filters = [BitInfo(info_level=0.99)]
     >>> encoding = {"air": {"compressor": compressor, "filters": filters}}
-    >>> ds.to_zarr('xbit.zarr', mode="w", encoding=encoding)
+    >>> _ = ds.to_zarr('xbit.zarr', mode="w", encoding=encoding)
     """
 
     codec_id = 'bitinfo'

pyproject.toml

@@ -59,7 +59,12 @@ test = [
 ]
 test_extras = [
     "importlib_metadata",
+]
+doctest = [
     "xarray",
+    "pooch",
+    "netCDF4",
+    "zarr",
 ]
 msgpack = [
     "msgpack",