Remove version checks for older versions than the min deps (pydata#5311)

xarray/core/dataset.py

@@ -4,7 +4,6 @@
 import sys
 import warnings
 from collections import defaultdict
-from distutils.version import LooseVersion
 from html import escape
 from numbers import Number
 from operator import methodcaller
@@ -4043,8 +4042,6 @@ def unstack(
                     for v in self.variables.values()
                 )
                 or sparse
-                # numpy full_like only added `shape` in 1.17
-                or LooseVersion(np.__version__) < LooseVersion("1.17")
                 # Until https://github.com/pydata/xarray/pull/4751 is resolved,
                 # we check explicitly whether it's a numpy array. Once that is
                 # resolved, explicitly exclude pint arrays.

xarray/core/variable.py

@@ -4,7 +4,6 @@
 import warnings
 from collections import defaultdict
 from datetime import timedelta
-from distutils.version import LooseVersion
 from typing import (
     Any,
     Dict,
@@ -1027,7 +1026,6 @@ def chunk(self, chunks={}, name=None, lock=False):
         -------
         chunked : xarray.Variable
         """
-        import dask
         import dask.array as da
 
         if chunks is None:
@@ -1057,12 +1055,10 @@ def chunk(self, chunks={}, name=None, lock=False):
                 data = indexing.ImplicitToExplicitIndexingAdapter(
                     data, indexing.OuterIndexer
                 )
-                if LooseVersion(dask.__version__) < "2.0.0":
-                    kwargs = {}
-                else:
-                    # All of our lazily loaded backend array classes should use NumPy
-                    # array operations.
-                    kwargs = {"meta": np.ndarray}
+
+                # All of our lazily loaded backend array classes should use NumPy
+                # array operations.
+                kwargs = {"meta": np.ndarray}
             else:
                 kwargs = {}