Move the various compat things to the compat module.

rest_framework/compat.py

@@ -4,16 +4,34 @@ versions of django/python, and compatibility wrappers around optional packages.
 """
 # flake8: noqa
 from __future__ import unicode_literals
-import six
 
 import django
 
+# Try to import six from Django, fallback to six itself (1.3.x)
+try:
+    from django.utils import six
+except:
+    import six
+
 # location of patterns, url, include changes in 1.4 onwards
 try:
     from django.conf.urls import patterns, url, include
 except:
     from django.conf.urls.defaults import patterns, url, include
 
+# Handle django.utils.encoding rename:
+# smart_unicode -> smart_text
+# force_unicode -> force_text
+try:
+    from django.utils.encoding import smart_text
+except ImportError:
+    from django.utils.encoding import smart_unicode as smart_text
+try:
+    from django.utils.encoding import force_text
+except ImportError:
+    from django.utils.encoding import force_unicode as force_text
+
+
 # django-filter is optional
 try:
     import django_filters
@@ -25,9 +43,9 @@ except:
 try:
     import cStringIO.StringIO as StringIO
 except ImportError:
-    from six import StringIO
+    StringIO = six.StringIO
 
-from six import BytesIO
+BytesIO = six.BytesIO
 
 
 # urlparse compat import (Required because it changed in python 3.x)

rest_framework/fields.py

 
 from __future__ import unicode_literals
-import six
 
 import copy
 import datetime
@@ -14,14 +13,12 @@ from django.conf import settings
 from django import forms
 from django.forms import widgets
 from django.utils.encoding import is_protected_type
-try:
-    from django.utils.encoding import smart_text
-except ImportError:
-    from django.utils.encoding import smart_unicode as smart_text
 from django.utils.translation import ugettext_lazy as _
 from rest_framework.compat import parse_date, parse_datetime
 from rest_framework.compat import timezone
 from rest_framework.compat import BytesIO
+from rest_framework.compat import six
+from rest_framework.compat import smart_text
 
 
 def is_simple_callable(obj):

rest_framework/parsers.py

@@ -5,14 +5,13 @@ They give us a generic way of being able to handle various media types
 on the request, such as form content or json encoded data.
 """
 
-import six
-
 from django.http import QueryDict
 from django.http.multipartparser import MultiPartParser as DjangoMultiPartParser
 from django.http.multipartparser import MultiPartParserError
 from django.utils import simplejson as json
 from rest_framework.compat import yaml, ETParseError
 from rest_framework.exceptions import ParseError
+from rest_framework.compat import six
 from xml.etree import ElementTree as ET
 from xml.parsers.expat import ExpatError
 import datetime

rest_framework/relations.py

@@ -6,13 +6,10 @@ from django.core.urlresolvers import resolve, get_script_prefix
 from django import forms
 from django.forms import widgets
 from django.forms.models import ModelChoiceIterator
-try:
-    from django.utils.encoding import smart_text
-except ImportError:
-    from django.utils.encoding import smart_unicode as smart_text
 from rest_framework.fields import Field, WritableField
 from rest_framework.reverse import reverse
 from rest_framework.compat import urlparse
+from rest_framework.compat import smart_text
 
 ##### Relational fields #####
 

rest_framework/request.py

@@ -9,7 +9,6 @@ The wrapped request then offers a richer API, in particular :
     - full support of PUT method, including support for file uploads
     - form overloading of HTTP method, content type and content
 """
-import six
 from rest_framework.compat import BytesIO
 
 from django.http.multipartparser import parse_header

rest_framework/response.py

-import six
-
 from django.core.handlers.wsgi import STATUS_CODE_TEXT
 from django.template.response import SimpleTemplateResponse
 
+from rest_framework.compat import six
+
 
 class Response(SimpleTemplateResponse):
     """

rest_framework/serializers.py

-import six
-
 import copy
 import datetime
 import types
@@ -8,6 +6,7 @@ from django.db import models
 from django.forms import widgets
 from django.utils.datastructures import SortedDict
 from rest_framework.compat import get_concrete_model
+from rest_framework.compat import six
 
 # Note: We do the following so that users of the framework can use this style:
 #

rest_framework/settings.py

@@ -19,8 +19,7 @@ back to the defaults.
 """
 from django.conf import settings
 from django.utils import importlib
-from six import string_types
-
+from rest_framework.compat import six
 
 
 USER_SETTINGS = getattr(settings, 'REST_FRAMEWORK', None)
@@ -100,7 +99,7 @@ def perform_import(val, setting_name):
     If the given setting is a string import notation,
     then perform the necessary import or imports.
     """
-    if isinstance(val, string_types):
+    if isinstance(val, six.string_types):
         return import_from_string(val, setting_name)
     elif isinstance(val, (list, tuple)):
         return [import_from_string(item, setting_name) for item in val]
@@ -118,6 +117,7 @@ def import_from_string(val, setting_name):
         module = importlib.import_module(module_path)
         return getattr(module, class_name)
     except:
+        raise
         msg = "Could not import '%s' for API setting '%s'" % (val, setting_name)
         raise ImportError(msg)
 

rest_framework/templatetags/rest_framework.py

 from __future__ import unicode_literals, absolute_import
-import six
 
 from django import template
 from django.core.urlresolvers import reverse
 from django.http import QueryDict
-try:
-    from django.utils.encoding import force_text
-except ImportError:
-    from django.utils.encoding import force_unicode as force_text
 from django.utils.html import escape
 from django.utils.safestring import SafeData, mark_safe
 from rest_framework.compat import urlparse
+from rest_framework.compat import force_text
+from rest_framework.compat import six
+
 import re
 import string
 

rest_framework/tests/files.py

-from rest_framework.compat import BytesIO
-
 import datetime
-import six
 
 from django.test import TestCase
 
 from rest_framework import serializers
+from rest_framework.compat import BytesIO
+from rest_framework.compat import six
 
 
 class UploadedFile(object):

rest_framework/tests/generics.py

 from __future__ import unicode_literals
 
-import six
-
 from django.db import models
 from django.test import TestCase
 from django.test.client import RequestFactory
 from django.utils import simplejson as json
 from rest_framework import generics, serializers, status
 from rest_framework.tests.models import BasicModel, Comment, SlugBasedModel
-
+from rest_framework.compat import six
 
 factory = RequestFactory()
 

rest_framework/tests/htmlrenderer.py

-import six
-
 from django.core.exceptions import PermissionDenied
 from django.http import Http404
 from django.test import TestCase
@@ -9,6 +7,7 @@ from rest_framework.compat import patterns, url
 from rest_framework.decorators import api_view, renderer_classes
 from rest_framework.renderers import TemplateHTMLRenderer
 from rest_framework.response import Response
+from rest_framework.compat import six
 
 
 @api_view(('GET',))

rest_framework/tests/renderers.py

 import pickle
 import re
-import six
 
 from django.core.cache import cache
 from django.test import TestCase
@@ -16,6 +15,7 @@ from rest_framework.parsers import YAMLParser, XMLParser
 from rest_framework.settings import api_settings
 
 from rest_framework.compat import StringIO
+from rest_framework.compat import six
 import datetime
 from decimal import Decimal
 

rest_framework/tests/request.py

 """
 Tests for content parsing, and form-overloaded content parsing.
 """
-import six
-
 from django.contrib.auth.models import User
 from django.contrib.auth import authenticate, login, logout
 from django.contrib.sessions.middleware import SessionMiddleware
@@ -22,6 +20,7 @@ from rest_framework.request import Request
 from rest_framework.response import Response
 from rest_framework.settings import api_settings
 from rest_framework.views import APIView
+from rest_framework.compat import six
 
 
 factory = RequestFactory()

rest_framework/tests/response.py

-import unittest
-import six
-
 from django.test import TestCase
 from rest_framework.compat import patterns, url, include
 from rest_framework.response import Response
@@ -12,6 +9,7 @@ from rest_framework.renderers import (
     BrowsableAPIRenderer
 )
 from rest_framework.settings import api_settings
+from rest_framework.compat import six
 
 
 class MockPickleRenderer(BaseRenderer):

rest_framework/utils/__init__.py

-
-import six
-
-try:
-    from django.utils.encoding import smart_text
-except ImportError:
-    from django.utils.encoding import smart_unicode as smart_text
-
 from django.utils.xmlutils import SimplerXMLGenerator
 from rest_framework.compat import StringIO
+from rest_framework.compat import six
+from rest_framework.compat import smart_text
 import re
 import xml.etree.ElementTree as ET