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/_context.py b/buildstream/_context.py
index cb29968a4..d2086af93 100644
--- a/buildstream/_context.py
+++ b/buildstream/_context.py
@@ -19,7 +19,8 @@
 
 import os
 import datetime
-from collections import deque, Mapping
+from collections import deque
+from collections.abc import Mapping
 from contextlib import contextmanager
 from . import utils
 from . import _cachekey