Fixed #18023 -- Removed bundled simplejson.

And started the deprecation path for django.utils.simplejson.

Thanks Alex Ogier, Clueless, and other contributors for their
work on the patch.

django/core/serializers/json.py

@@ -2,14 +2,17 @@
 Serialize data to/from JSON
 """
 
+# Avoid shadowing the standard library json module
+from __future__ import absolute_import
+
 import datetime
 import decimal
+import json
 from StringIO import StringIO
 
 from django.core.serializers.base import DeserializationError
 from django.core.serializers.python import Serializer as PythonSerializer
 from django.core.serializers.python import Deserializer as PythonDeserializer
-from django.utils import simplejson
 from django.utils.timezone import is_aware
 
 class Serializer(PythonSerializer):
@@ -19,10 +22,10 @@ class Serializer(PythonSerializer):
     internal_use_only = False
 
     def end_serialization(self):
-        if simplejson.__version__.split('.') >= ['2', '1', '3']:
+        if json.__version__.split('.') >= ['2', '1', '3']:
             # Use JS strings to represent Python Decimal instances (ticket #16850)
             self.options.update({'use_decimal': False})
-        simplejson.dump(self.objects, self.stream, cls=DjangoJSONEncoder, **self.options)
+        json.dump(self.objects, self.stream, cls=DjangoJSONEncoder, **self.options)
 
     def getvalue(self):
         if callable(getattr(self.stream, 'getvalue', None)):
@@ -38,7 +41,7 @@ def Deserializer(stream_or_string, **options):
     else:
         stream = stream_or_string
     try:
-        for obj in PythonDeserializer(simplejson.load(stream), **options):
+        for obj in PythonDeserializer(json.load(stream), **options):
             yield obj
     except GeneratorExit:
         raise
@@ -47,7 +50,7 @@ def Deserializer(stream_or_string, **options):
         raise DeserializationError(e)
 
 
-class DjangoJSONEncoder(simplejson.JSONEncoder):
+class DjangoJSONEncoder(json.JSONEncoder):
     """
     JSONEncoder subclass that knows how to encode date/time and decimal types.
     """

django/core/signing.py

@@ -33,12 +33,13 @@ There are 65 url-safe characters: the 64 used by url-safe base64 and the ':'.
 These functions make use of all of them.
 """
 import base64
+import json
 import time
 import zlib
 
 from django.conf import settings
 from django.core.exceptions import ImproperlyConfigured
-from django.utils import baseconv, simplejson
+from django.utils import baseconv
 from django.utils.crypto import constant_time_compare, salted_hmac
 from django.utils.encoding import force_unicode, smart_str
 from django.utils.importlib import import_module
@@ -89,14 +90,14 @@ def get_cookie_signer(salt='django.core.signing.get_cookie_signer'):
 
 class JSONSerializer(object):
     """
-    Simple wrapper around simplejson to be used in signing.dumps and
+    Simple wrapper around json to be used in signing.dumps and
     signing.loads.
     """
     def dumps(self, obj):
-        return simplejson.dumps(obj, separators=(',', ':'))
+        return json.dumps(obj, separators=(',', ':'))
 
     def loads(self, data):
-        return simplejson.loads(data)
+        return json.loads(data)
 
 
 def dumps(obj, key=None, salt='django.core.signing', serializer=JSONSerializer, compress=False):