From 70c2c517f95a20fc6a76bdf5e29e186b747e422a Mon Sep 17 00:00:00 2001
From: Andreas Kloeckner <inform@tiker.net>
Date: Wed, 2 Jan 2019 14:57:24 -0500
Subject: [PATCH] Fix Py3.7 deprecation

---
 pytools/persistent_dict.py | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/pytools/persistent_dict.py b/pytools/persistent_dict.py
index dd051ba..75b162d 100644
--- a/pytools/persistent_dict.py
+++ b/pytools/persistent_dict.py
@@ -30,8 +30,12 @@ THE SOFTWARE.
 import logging
 logger = logging.getLogger(__name__)
 
+try:
+    import collections.abc as abc
+except ImportError:
+    # Python 2
+    import collections as abc
 
-import collections
 import functools
 import six
 import sys
@@ -362,7 +366,7 @@ class _LinkedList(object):
         node[1] = node[2] = None
 
 
-class _LRUCache(collections.MutableMapping):
+class _LRUCache(abc.MutableMapping):
     """A mapping that keeps at most *maxsize* items with an LRU replacement policy.
     """
     def __init__(self, maxsize):
-- 
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