  from django.conf.urls import url
  from django.core.exceptions import ImproperlyConfigured
  from django.core.urlresolvers import NoReverseMatch
  from rest_framework import views
  from rest_framework.compat import get_resolver_match, OrderedDict
  from rest_framework.response import Response
  from rest_framework.reverse import reverse
  from rest_framework.urlpatterns import format_suffix_patterns
  
  
  Route = namedtuple('Route', ['url', 'mapping', 'name', 'initkwargs'])
 
</s> remove from django.core.exceptions import ImproperlyConfigured
 </s> add  </s> remove from rest_framework import parsers
from rest_framework import renderers
 </s> add 
  from django.conf.urls import url
  from django.core.exceptions import ImproperlyConfigured
  from django.core.urlresolvers import NoReverseMatch
  from rest_framework import views


  from rest_framework.reverse import reverse
  from rest_framework.urlpatterns import format_suffix_patterns
  
  
  Route = namedtuple('Route', ['url', 'mapping', 'name', 'initkwargs'])
keep keep keep keep replace replace keep keep keep keep keep
 Cleanup import following PEP 8 style guide 
rest_framework/routers.py