Refs #24133 -- Removed legacy formatting syntax in success_url placeholders.

Per deprecation timeline.

django/views/generic/edit.py

 import inspect
-import re
 import warnings
 
 from django.core.exceptions import ImproperlyConfigured
@@ -13,8 +12,6 @@ from django.views.generic.detail import (
     BaseDetailView, SingleObjectMixin, SingleObjectTemplateResponseMixin,
 )
 
-PERCENT_PLACEHOLDER_REGEX = re.compile(r'%\([^\)]+\)')  # RemovedInDjango110Warning
-
 
 class FormMixinBase(type):
     def __new__(cls, name, bases, attrs):
@@ -173,16 +170,6 @@ class ModelFormMixin(FormMixin, SingleObjectMixin):
         Returns the supplied URL.
         """
         if self.success_url:
-            # force_text can be removed with deprecation warning
-            self.success_url = force_text(self.success_url)
-            if PERCENT_PLACEHOLDER_REGEX.search(self.success_url):
-                warnings.warn(
-                    "%()s placeholder style in success_url is deprecated. "
-                    "Please replace them by the {} Python format syntax.",
-                    RemovedInDjango110Warning, stacklevel=2
-                )
-                url = self.success_url % self.object.__dict__
-            else:
             url = self.success_url.format(**self.object.__dict__)
         else:
             try:
@@ -308,16 +295,6 @@ class DeletionMixin(object):
 
     def get_success_url(self):
         if self.success_url:
-            # force_text can be removed with deprecation warning
-            self.success_url = force_text(self.success_url)
-            if PERCENT_PLACEHOLDER_REGEX.search(self.success_url):
-                warnings.warn(
-                    "%()s placeholder style in success_url is deprecated. "
-                    "Please replace them by the {} Python format syntax.",
-                    RemovedInDjango110Warning, stacklevel=2
-                )
-                return self.success_url % self.object.__dict__
-            else:
             return self.success_url.format(**self.object.__dict__)
         else:
             raise ImproperlyConfigured(

docs/ref/class-based-views/mixins-editing.txt

@@ -160,12 +160,6 @@ ModelFormMixin
         example, you could use ``success_url="/polls/{slug}/"`` to
         redirect to a URL composed out of the ``slug`` field on a model.
 
-        .. versionchanged:: 1.8
-
-            Support for the new brace-based Python formatting syntax has been
-            added. The old ``%(slug)s`` placeholder syntax support has been
-            deprecated and will be removed in Django 1.10.
-
     .. method:: get_form_class()
 
         Retrieve the form class to instantiate. If
@@ -259,12 +253,6 @@ DeletionMixin
         could use ``success_url="/parent/{parent_id}/"`` to redirect to a URL
         composed out of the ``parent_id`` field on a model.
 
-        .. versionchanged:: 1.8
-
-            Support for the new brace-based Python formatting syntax has been
-            added. The old ``%(slug)s`` placeholder syntax support has been
-            deprecated and will be removed in Django 1.10.
-
     .. method:: get_success_url()
 
         Returns the url to redirect to when the nominated object has been

tests/generic_views/test_edit.py

@@ -5,9 +5,7 @@ import warnings
 from django import forms
 from django.core.exceptions import ImproperlyConfigured
 from django.core.urlresolvers import reverse
-from django.test import (
-    SimpleTestCase, TestCase, ignore_warnings, override_settings,
-)
+from django.test import SimpleTestCase, TestCase, override_settings
 from django.test.client import RequestFactory
 from django.utils.deprecation import RemovedInDjango110Warning
 from django.views.generic.base import View
@@ -152,7 +150,6 @@ class CreateViewTests(TestCase):
         self.assertRedirects(res, '/edit/authors/create/')
         self.assertQuerysetEqual(Author.objects.all(), ['<Author: Randall Munroe>'])
 
-    @ignore_warnings(category=RemovedInDjango110Warning)
     def test_create_with_interpolated_redirect(self):
         res = self.client.post(
             '/edit/authors/create/interpolate_redirect/',
@@ -292,7 +289,6 @@ class UpdateViewTests(TestCase):
         self.assertRedirects(res, '/edit/authors/create/')
         self.assertQuerysetEqual(Author.objects.all(), ['<Author: Randall Munroe (author of xkcd)>'])
 
-    @ignore_warnings(category=RemovedInDjango110Warning)
     def test_update_with_interpolated_redirect(self):
         a = Author.objects.create(
             name='Randall Munroe',
@@ -399,7 +395,6 @@ class DeleteViewTests(TestCase):
         self.assertRedirects(res, '/edit/authors/create/')
         self.assertQuerysetEqual(Author.objects.all(), [])
 
-    @ignore_warnings(category=RemovedInDjango110Warning)
     def test_delete_with_interpolated_redirect(self):
         a = Author.objects.create(**{'name': 'Randall Munroe', 'slug': 'randall-munroe'})
         res = self.client.post('/edit/author/%d/delete/interpolate_redirect/' % a.pk)

tests/generic_views/urls.py

@@ -77,7 +77,7 @@ urlpatterns = [
     url(r'^edit/authors/create/redirect/$',
         views.NaiveAuthorCreate.as_view(success_url='/edit/authors/create/')),
     url(r'^edit/authors/create/interpolate_redirect/$',
-        views.NaiveAuthorCreate.as_view(success_url='/edit/author/%(id)d/update/')),
+        views.NaiveAuthorCreate.as_view(success_url='/edit/author/{id}/update/')),
     url(r'^edit/authors/create/interpolate_redirect_nonascii/$',
         views.NaiveAuthorCreate.as_view(success_url='/%C3%A9dit/author/{id}/update/')),
     url(r'^edit/authors/create/restricted/$',
@@ -92,7 +92,7 @@ urlpatterns = [
     url(r'^edit/author/(?P<pk>[0-9]+)/update/redirect/$',
         views.NaiveAuthorUpdate.as_view(success_url='/edit/authors/create/')),
     url(r'^edit/author/(?P<pk>[0-9]+)/update/interpolate_redirect/$',
-        views.NaiveAuthorUpdate.as_view(success_url='/edit/author/%(id)d/update/')),
+        views.NaiveAuthorUpdate.as_view(success_url='/edit/author/{id}/update/')),
     url(r'^edit/author/(?P<pk>[0-9]+)/update/interpolate_redirect_nonascii/$',
         views.NaiveAuthorUpdate.as_view(success_url='/%C3%A9dit/author/{id}/update/')),
     url(r'^[eé]dit/author/(?P<pk>[0-9]+)/update/$',
@@ -106,7 +106,7 @@ urlpatterns = [
     url(r'^edit/author/(?P<pk>[0-9]+)/delete/redirect/$',
         views.NaiveAuthorDelete.as_view(success_url='/edit/authors/create/')),
     url(r'^edit/author/(?P<pk>[0-9]+)/delete/interpolate_redirect/$',
-        views.NaiveAuthorDelete.as_view(success_url='/edit/authors/create/?deleted=%(id)s')),
+        views.NaiveAuthorDelete.as_view(success_url='/edit/authors/create/?deleted={id}')),
     url(r'^edit/author/(?P<pk>[0-9]+)/delete/interpolate_redirect_nonascii/$',
         views.NaiveAuthorDelete.as_view(success_url='/%C3%A9dit/authors/create/?deleted={id}')),
     url(r'^edit/author/(?P<pk>[0-9]+)/delete/$',