20 lines
636 B
Diff
20 lines
636 B
Diff
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diff --git a/unittest2/compatibility.py b/unittest2/compatibility.py
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index 9e5f1a5..473957c 100644
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--- a/unittest2/compatibility.py
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+++ b/unittest2/compatibility.py
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@@ -1,4 +1,5 @@
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import collections
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+import collections.abc
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import os
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import sys
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@@ -140,7 +141,7 @@ except ImportError:
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### ChainMap (helper for configparser and string.Template)
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########################################################################
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-class ChainMap(collections.MutableMapping):
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+class ChainMap(collections.abc.MutableMapping):
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''' A ChainMap groups multiple dicts (or other mappings) together
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to create a single, updateable view.
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