Switch to collections.abc.*

The abstract base classes previously defined in 'collections' were moved
to 'collections.abc' in 3.3. The aliases will be removed in 3.10.
Preempt this change now with a simple find-replace:

  $ ag -l 'collections.($TYPES)' | \
      xargs sed -i 's/\(collections\)\.\($TYPES\)/\1.abc.\2/g'

Where $TYPES is the list of moved ABCs from [1].

[1] https://docs.python.org/3/library/collections.abc.html

Change-Id: I85f2757852c0313967f5d82166124feb10aa4c6a
Signed-off-by: Stephen Finucane <stephenfin@redhat.com>

2 files changed, 5 insertions, 7 deletions

diff --git a/oslo_utils/strutils.py b/oslo_utils/strutils.py
index 6295bde..16f1935 100644
--- a/oslo_utils/strutils.py
+++ b/oslo_utils/strutils.py
@@ -17,7 +17,7 @@
 System-level utilities and helper functions.
 """
 
-import collections
+import collections.abc
 import math
 import re
 import unicodedata
@@ -400,12 +400,12 @@ def mask_dict_password(dictionary, secret="***"):  # nosec
 
     """
 
-    if not isinstance(dictionary, collections.Mapping):
+    if not isinstance(dictionary, collections.abc.Mapping):
         raise TypeError("Expected a Mapping, got %s instead."
                         % type(dictionary))
     out = {}
     for k, v in dictionary.items():
-        if isinstance(v, collections.Mapping):
+        if isinstance(v, collections.abc.Mapping):
             out[k] = mask_dict_password(v, secret=secret)
             continue
         # NOTE(jlvillal): Check to see if anything in the dictionary 'key'
diff --git a/oslo_utils/tests/test_strutils.py b/oslo_utils/tests/test_strutils.py
index f43cef2..22dd692 100644
--- a/oslo_utils/tests/test_strutils.py
+++ b/oslo_utils/tests/test_strutils.py
@@ -1,5 +1,3 @@
-# -*- coding: utf-8 -*-
-
 # Copyright 2011 OpenStack Foundation.
 # All Rights Reserved.
 #
@@ -15,7 +13,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import collections
+import collections.abc
 import copy
 import math
 from unittest import mock
@@ -665,7 +663,7 @@ class MaskPasswordTestCase(test_base.BaseTestCase):
         self.assertEqual(expected, strutils.mask_password(payload))
 
 
-class TestMapping(collections.Mapping):
+class TestMapping(collections.abc.Mapping):
     """Test class for non-dict mappings"""
     def __init__(self):
         super(TestMapping, self).__init__()