Fixed #7990 -- Modified serializers to use StringIO, rather than cStringIO, due to potential unicode issues.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@8151 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/core/serializers/base.py

@@ -2,10 +2,8 @@
 Module for abstract serializer/unserializer base classes.
 """
 
-try:
-    from cStringIO import StringIO
-except ImportError:
-    from StringIO import StringIO
+from StringIO import StringIO
+
 from django.db import models
 from django.utils.encoding import smart_str, smart_unicode
 from django.utils import datetime_safe

django/core/serializers/json.py

@@ -3,14 +3,13 @@ Serialize data to/from JSON
 """
 
 import datetime
-from django.utils import simplejson
+from StringIO import StringIO
+
 from django.core.serializers.python import Serializer as PythonSerializer
 from django.core.serializers.python import Deserializer as PythonDeserializer
 from django.utils import datetime_safe
-try:
-    from cStringIO import StringIO
-except ImportError:
-    from StringIO import StringIO
+from django.utils import simplejson
+
 try:
     import decimal
 except ImportError:

django/core/serializers/pyyaml.py

@@ -4,14 +4,12 @@ YAML serializer.
 Requires PyYaml (http://pyyaml.org/), but that's checked for in __init__.
 """
 
+from StringIO import StringIO
+import yaml
+
 from django.db import models
 from django.core.serializers.python import Serializer as PythonSerializer
 from django.core.serializers.python import Deserializer as PythonDeserializer
-try:
-    from cStringIO import StringIO
-except ImportError:
-    from StringIO import StringIO
-import yaml
 
 class Serializer(PythonSerializer):
     """