Fix python warnings: Use collections.abc instead collectionsjjardon/warnings_collections

Since python 3.3, collections has been moved to collections.abc module.
For backwards compatibility, they continue to be visible in this module through Python 3.7.
Subsequently, they will be removed entirely.

See https://docs.python.org/3/library/collections.html

1 files changed, 2 insertions, 1 deletions

diff --git a/buildstream/element.py b/buildstream/element.py
index 1e6bf548c..de1988d2a 100644
--- a/buildstream/element.py
+++ b/buildstream/element.py
@@ -76,7 +76,8 @@ import os
 import re
 import stat
 import copy
-from collections import Mapping, OrderedDict
+from collections import OrderedDict
+from collections.abc import Mapping
 from contextlib import contextmanager
 import tempfile
 import shutil