Do not use the deprecated distutils (xarray-contrib#247)

* Do not use the deprecated distutils

* Update docs/source/whats-new.rst

* Fix import sorting

---------

Co-authored-by: Tom Nicholas <tom@cworthy.org>

Author: avalentino

datatree/tests/__init__.py

@@ -1,7 +1,7 @@
 import importlib
-from distutils import version
 
 import pytest
+from packaging import version
 
 
 def _importorskip(modname, minversion=None):
@@ -21,7 +21,7 @@ def LooseVersion(vstring):
     # Our development version is something like '0.10.9+aac7bfc'
     # This function just ignores the git commit id.
     vstring = vstring.split("+")[0]
-    return version.LooseVersion(vstring)
+    return version.parse(vstring)
 
 
 has_zarr, requires_zarr = _importorskip("zarr")

docs/source/whats-new.rst

@@ -57,6 +57,8 @@ Documentation
 Internal Changes
 ~~~~~~~~~~~~~~~~
 
+* No longer use the deprecated `distutils` package.
+
 .. _whats-new.v0.0.12:
 
 v0.0.12 (03/07/2023)

pyproject.toml

@@ -20,6 +20,7 @@ classifiers = [
 requires-python = ">=3.9"
 dependencies = [
     "xarray >=2022.6.0",
+    "packaging",
 ]
 dynamic = ["version"]