Ensure json.dumps(separators=...) works on both 2.x and 3.x

rest_framework/compat.py

@@ -291,6 +291,15 @@ except ImportError:
     oauth2_constants = None
     provider_now = None
 
+# `seperators` argument to `json.dumps()` differs between 2.x and 3.x
+# See: http://bugs.python.org/issue22767
+if six.PY3:
+    SHORT_SEPARATORS = (',', ':')
+    LONG_SEPARATORS = (', ', ': ')
+else:
+    SHORT_SEPARATORS = (b',', b':')
+    LONG_SEPARATORS = (b', ', b': ')
+
 
 # Handle lazy strings across Py2/Py3
 from django.utils.functional import Promise

rest_framework/renderers.py

@@ -18,7 +18,9 @@ from django.test.client import encode_multipart
 from django.utils import six
 from django.utils.xmlutils import SimplerXMLGenerator
 from rest_framework import exceptions, serializers, status, VERSION
-from rest_framework.compat import StringIO, smart_text, yaml
+from rest_framework.compat import (
+    SHORT_SEPARATORS, LONG_SEPARATORS, StringIO, smart_text, yaml
+)
 from rest_framework.exceptions import ParseError
 from rest_framework.settings import api_settings
 from rest_framework.request import is_form_media_type, override_method
@@ -87,7 +89,7 @@ class JSONRenderer(BaseRenderer):
 
         renderer_context = renderer_context or {}
         indent = self.get_indent(accepted_media_type, renderer_context)
-        separators = (',', ':') if (indent is None and self.compact) else (', ', ': ')
+        separators = SHORT_SEPARATORS if (indent is None and self.compact) else LONG_SEPARATORS
 
         ret = json.dumps(
             data, cls=self.encoder_class,