move compatibility checks into compat.py

rest_framework/compat.py

@@ -265,3 +265,13 @@ except ImportError:
         klass.__unicode__ = klass.__str__
         klass.__str__ = lambda self: self.__unicode__().encode('utf-8')
         return klass
+
+try:
+    from collections import OrderedDict
+except ImportError:
+    from django.utils.datastructures import SortedDict as OrderedDict
+
+if django.VERSION >= (1, 8):
+    from django.contrib.contenttypes.fields import GenericForeignKey
+else:
+    from django.contrib.contenttypes.generic import GenericForeignKey

rest_framework/fields.py

@@ -25,16 +25,11 @@ from django.utils.translation import ugettext_lazy as _
 from django.utils.dateparse import parse_date, parse_datetime, parse_time
 from rest_framework import ISO_8601
 from rest_framework.compat import (
-    BytesIO, smart_text,
+    BytesIO, smart_text, OrderedDict,
     force_text, is_non_str_iterable
 )
 from rest_framework.settings import api_settings
 
-try:
-    from collections import OrderedDict
-except ImportError:
-    from django.utils.datastructures import SortedDict as OrderedDict
-
 
 def is_simple_callable(obj):
     """

rest_framework/routers.py

@@ -21,15 +21,11 @@ from django.conf.urls import patterns, url
 from django.core.exceptions import ImproperlyConfigured
 from django.core.urlresolvers import NoReverseMatch
 from rest_framework import views
+from rest_framework.compat import OrderedDict
 from rest_framework.response import Response
 from rest_framework.reverse import reverse
 from rest_framework.urlpatterns import format_suffix_patterns
 
-try:
-    from collections import OrderedDict
-except ImportError:
-    from django.utils.datastructures import SortedDict as OrderedDict
-
 
 Route = namedtuple('Route', ['url', 'mapping', 'name', 'initkwargs'])
 DynamicDetailRoute = namedtuple('DynamicDetailRoute', ['url', 'name', 'initkwargs'])

rest_framework/serializers.py

@@ -23,6 +23,7 @@ from django.forms import widgets
 from django.utils import six
 from django.utils.functional import cached_property
 from django.core.exceptions import ObjectDoesNotExist
+from rest_framework.compat import OrderedDict, GenericForeignKey
 from rest_framework.settings import api_settings
 
 
@@ -36,16 +37,6 @@ from rest_framework.settings import api_settings
 from rest_framework.relations import *  # NOQA
 from rest_framework.fields import *  # NOQA
 
-try:
-    from collections import OrderedDict
-except ImportError:
-    from django.utils.datastructures import SortedDict as OrderedDict
-
-if django.VERSION >= (1, 8):
-    from django.contrib.contenttypes.fields import GenericForeignKey
-else:
-    from django.contrib.contenttypes.generic import GenericForeignKey
-
 
 def _resolve_model(obj):
     """

rest_framework/utils/encoders.py

@@ -5,18 +5,13 @@ from __future__ import unicode_literals
 from django.utils import timezone
 from django.db.models.query import QuerySet
 from django.utils.functional import Promise
-from rest_framework.compat import force_text
+from rest_framework.compat import force_text, OrderedDict
 from rest_framework.serializers import DictWithMetadata, OrderedDictWithMetadata
 import datetime
 import decimal
 import types
 import json
 
-try:
-    from collections import OrderedDict
-except ImportError:
-    from django.utils.datastructures import SortedDict as OrderedDict
-
 
 class JSONEncoder(json.JSONEncoder):
     """

rest_framework/views.py

@@ -7,17 +7,12 @@ from django.core.exceptions import PermissionDenied
 from django.http import Http404
 from django.views.decorators.csrf import csrf_exempt
 from rest_framework import status, exceptions
-from rest_framework.compat import smart_text, HttpResponseBase, View
+from rest_framework.compat import smart_text, HttpResponseBase, OrderedDict, View
 from rest_framework.request import Request
 from rest_framework.response import Response
 from rest_framework.settings import api_settings
 from rest_framework.utils import formatting
 
-try:
-    from collections import OrderedDict
-except ImportError:
-    from django.utils.datastructures import SortedDict as OrderedDict
-
 
 def get_view_name(view_cls, suffix=None):
     """