From 454ca3f3f4a39fd8db3eb92facc6599a32511251 Mon Sep 17 00:00:00 2001
From: Alexandru Fikl <alexfikl@gmail.com>
Date: Sun, 28 Apr 2019 19:41:57 -0500
Subject: [PATCH] tools: fix deprecation

---
 sumpy/tools.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/sumpy/tools.py b/sumpy/tools.py
index 863b4bb9..540208f3 100644
--- a/sumpy/tools.py
+++ b/sumpy/tools.py
@@ -559,10 +559,13 @@ class MatrixBlockIndexRanges(object):
 # Author: Raymond Hettinger
 # License: MIT
 
-import collections
+try:
+    from collections.abc import MutableSet
+except ImportError:
+    from collections import MutableSet
 
 
-class OrderedSet(collections.MutableSet):
+class OrderedSet(MutableSet):
 
     def __init__(self, iterable=None):
         self.end = end = []
-- 
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