Fixed error and some warning returned by pylint

apps/permissions/views.py

@@ -1,12 +1,11 @@
 from django.utils.translation import ugettext as _
-from django.http import HttpResponse, HttpResponseRedirect, Http404
-from django.shortcuts import render_to_response, get_object_or_404, redirect
+from django.http import HttpResponseRedirect
+from django.shortcuts import render_to_response, get_object_or_404
 from django.template import RequestContext
 from django.contrib import messages
-from django.views.generic.list_detail import object_detail, object_list
+from django.views.generic.list_detail import object_list
 from django.core.urlresolvers import reverse
 from django.views.generic.create_update import create_object, delete_object, update_object
-from django.conf import settings
 from django.contrib.contenttypes.models import ContentType
 from django.core.exceptions import ObjectDoesNotExist
 
@@ -55,7 +54,7 @@ def role_permissions(request, role_id):
     role = get_object_or_404(Role, pk=role_id)
     form = RoleForm_view(instance=role)
 
-    role_permissions = Permission.objects.get_for_holder(role)
+    role_permissions_list = Permission.objects.get_for_holder(role)
     subtemplates_dict = [
         {
             'name':'generic_list_subtemplate.html',
@@ -64,7 +63,7 @@ def role_permissions(request, role_id):
             'extra_columns':[
                 {'name':_(u'namespace'), 'attribute':'namespace'},
                 {'name':_(u'name'), 'attribute':'label'},
-                {'name':_(u'state'), 'attribute':lambda x: _role_permission_link(role, x, role_permissions)}
+                {'name':_(u'state'), 'attribute':lambda x: _role_permission_link(role, x, role_permissions_list)}
             ],
             'hide_link':True,
             'hide_object':True,