  from django.core.exceptions import ImproperlyConfigured
  
  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'])
  DynamicDetailRoute = namedtuple('DynamicDetailRoute', ['url', 'name', 'initkwargs'])
 
</s> remove from rest_framework.compat import get_resolver_match, OrderedDict
from rest_framework.response import Response
 </s> add  </s> remove from django.core.exceptions import ImproperlyConfigured
 </s> add  </s> remove from rest_framework.compat import django_filters, guardian, get_model_name
 </s> add from django.db import models
from django.core.exceptions import ImproperlyConfigured

from rest_framework.response import Response
from rest_framework.compat import get_resolver_match, OrderedDict
  from django.core.exceptions import ImproperlyConfigured
  
  from rest_framework import views
  from rest_framework.reverse import reverse
from rest_framework.response import Response
from rest_framework.compat import get_resolver_match, OrderedDict
  from rest_framework.urlpatterns import format_suffix_patterns
  
  
  Route = namedtuple('Route', ['url', 'mapping', 'name', 'initkwargs'])
  DynamicDetailRoute = namedtuple('DynamicDetailRoute', ['url', 'name', 'initkwargs'])
keep keep keep add keep keep keep keep keep
 Cleanup import following PEP 8 style guide 
rest_framework/routers.py