import from collections.abc only

alexfikl · inducer · commit ddac6dd4f88f · 2022-11-06T03:01:00.000-06:00
diff --git a/sumpy/tools.py b/sumpy/tools.py
@@ -686,10 +686,7 @@ def get_kernel(self):
 # Author: Raymond Hettinger
 # License: MIT
 
-try:
-    from collections.abc import MutableSet
-except ImportError:
-    from collections import MutableSet
+from collections.abc import MutableSet
 
 
 class OrderedSet(MutableSet):
