Remove py37 collections.abc deprecation warnings

xarray/backends/common.py

@@ -7,7 +7,8 @@
 import time
 import traceback
 import warnings
-from collections import Mapping, OrderedDict
+from collections.abc import Mapping
+from collections import OrderedDict
 from functools import partial
 
 import numpy as np

xarray/core/dataset.py

@@ -3,7 +3,8 @@
 import functools
 import sys
 import warnings
-from collections import Mapping, defaultdict
+from collections import defaultdict
+from collections.abc import Mapping
 from distutils.version import LooseVersion
 from numbers import Number
 
@@ -1415,7 +1416,7 @@ def _validate_indexers(self, indexers):
         """ Here we make sure
         + indexer has a valid keys
         + indexer is in a valid data type
-        + string indexers are cast to the appropriate date type if the 
+        + string indexers are cast to the appropriate date type if the
           associated index is a DatetimeIndex or CFTimeIndex
         """
         from .dataarray import DataArray
@@ -1998,7 +1999,7 @@ def _validate_interp_indexer(x, new_x):
                                'Instead got\n{}'.format(new_x))
             else:
                 return (x, new_x)
-            
+
         variables = OrderedDict()
         for name, var in iteritems(obj._variables):
             if name not in indexers:

xarray/core/indexing.py

@@ -2,7 +2,8 @@
 
 import functools
 import operator
-from collections import Hashable, defaultdict
+from collections.abc import Hashable
+from collections import defaultdict
 from datetime import timedelta
 
 import numpy as np

xarray/core/missing.py

@@ -1,7 +1,7 @@
 from __future__ import absolute_import, division, print_function
 
 import warnings
-from collections import Iterable
+from collections.abc import Iterable
 from functools import partial
 
 import numpy as np

xarray/core/utils.py

@@ -7,7 +7,7 @@
 import itertools
 import re
 import warnings
-from collections import Iterable, Mapping, MutableMapping, MutableSet
+from collections.abc import Iterable, Mapping, MutableMapping, MutableSet
 
 import numpy as np
 import pandas as pd