bpo-30144: Import collections ABC from collections.abc rather than collections. (#1263)
diff --git a/Lib/shelve.py b/Lib/shelve.py
index 581baf1..4a56c93 100644
--- a/Lib/shelve.py
+++ b/Lib/shelve.py
@@ -59,11 +59,11 @@
from pickle import Pickler, Unpickler
from io import BytesIO
-import collections
+import collections.abc
__all__ = ["Shelf", "BsdDbShelf", "DbfilenameShelf", "open"]
-class _ClosedDict(collections.MutableMapping):
+class _ClosedDict(collections.abc.MutableMapping):
'Marker for a closed dict. Access attempts raise a ValueError.'
def closed(self, *args):
@@ -74,7 +74,7 @@
return '<Closed Dictionary>'
-class Shelf(collections.MutableMapping):
+class Shelf(collections.abc.MutableMapping):
"""Base class for shelf implementations.
This is initialized with a dictionary-like object.