[1.11.x] Fixed #28204 -- Fixed MultipleObjectMixin.paginate_queryset() crash on Python 2 if InvalidPage message contains non-ASCII.

django/views/generic/list.py

@@ -5,6 +5,7 @@ from django.core.paginator import InvalidPage, Paginator
 from django.db.models.query import QuerySet
 from django.http import Http404
 from django.utils import six
+from django.utils.encoding import force_text
 from django.utils.translation import ugettext as _
 from django.views.generic.base import ContextMixin, TemplateResponseMixin, View
 
@@ -80,7 +81,7 @@ class MultipleObjectMixin(ContextMixin):
         except InvalidPage as e:
             raise Http404(_('Invalid page (%(page_number)s): %(message)s') % {
                 'page_number': page_number,
-                'message': str(e)
+                'message': force_text(e),
             })
 
     def get_paginate_by(self, queryset):

docs/releases/1.11.2.txt

@@ -36,3 +36,6 @@ Bugfixes
 * Relaxed the validation added in Django 1.11 of the fields in the ``defaults``
   argument of ``QuerySet.get_or_create()`` and ``update_or_create()`` to
   reallow settable model properties (:ticket:`28222`).
+
+* Fixed ``MultipleObjectMixin.paginate_queryset()`` crash on Python 2 if the
+  ``InvalidPage`` message contains non-ASCII (:ticket:`28204`).

tests/generic_views/test_list.py

@@ -5,6 +5,7 @@ import datetime
 
 from django.core.exceptions import ImproperlyConfigured
 from django.test import TestCase, override_settings
+from django.utils import translation
 from django.utils.encoding import force_str
 from django.views.generic.base import View
 
@@ -103,6 +104,13 @@ class ListViewTests(TestCase):
         res = self.client.get('/list/authors/paginated/42/')
         self.assertEqual(res.status_code, 404)
 
+    def test_paginated_page_out_of_range_non_ascii_message(self):
+        msg = 'Ung\xfcltige Seite (42): Diese Seite enth\xe4lt keine Ergebnisse'
+        with translation.override('de'):
+            res = self.client.get('/list/authors/paginated/42/')
+            self.assertEqual(res.status_code, 404)
+            self.assertEqual(res.context['exception'], msg)
+
     def test_paginated_invalid_page(self):
         self._make_authors(100)
         res = self.client.get('/list/authors/paginated/?page=frog')