From 319071d3192fe09262d118a1c6e5977107eacb3a Mon Sep 17 00:00:00 2001
From: Charlie Hornsby <charlie.hornsby@hotmail.co.uk>
Date: Sat, 20 Oct 2018 18:29:59 +0300
Subject: [PATCH] Alias and use compat version of
 collections.abc.MutableMapping

Since the MutableMapping class will no longer be available to import
directly from the collections module in Python 3.8, we should create an
alias for it in the compat module and use that instead.
---
 rest_framework/compat.py                   | 4 ++--
 rest_framework/utils/serializer_helpers.py | 5 ++---
 2 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/rest_framework/compat.py b/rest_framework/compat.py
index 1d34828bd..061e7a4e9 100644
--- a/rest_framework/compat.py
+++ b/rest_framework/compat.py
@@ -12,10 +12,10 @@ from django.views.generic import View
 
 try:
     # Python 3
-    from collections.abc import Mapping   # noqa
+    from collections.abc import Mapping, MutableMapping   # noqa
 except ImportError:
     # Python 2.7
-    from collections import Mapping   # noqa
+    from collections import Mapping, MutableMapping   # noqa
 
 try:
     # Python 3
diff --git a/rest_framework/utils/serializer_helpers.py b/rest_framework/utils/serializer_helpers.py
index 6b662a66c..c24e51d09 100644
--- a/rest_framework/utils/serializer_helpers.py
+++ b/rest_framework/utils/serializer_helpers.py
@@ -1,11 +1,10 @@
 from __future__ import unicode_literals
 
-import collections
 from collections import OrderedDict
 
 from django.utils.encoding import force_text
 
-from rest_framework.compat import unicode_to_repr
+from rest_framework.compat import MutableMapping, unicode_to_repr
 from rest_framework.utils import json
 
 
@@ -130,7 +129,7 @@ class NestedBoundField(BoundField):
         return self.__class__(self._field, values, self.errors, self._prefix)
 
 
-class BindingDict(collections.MutableMapping):
+class BindingDict(MutableMapping):
     """
     This dict-like object is used to store fields on a serializer.