diff --git a/django/contrib/auth/mixins.py b/django/contrib/auth/mixins.py
index 362a734f96..e83e0ee805 100644
--- a/django/contrib/auth/mixins.py
+++ b/django/contrib/auth/mixins.py
@@ -93,7 +93,7 @@ class UserPassesTestMixin(AccessMixin):
 
     def test_func(self):
         raise NotImplementedError(
-            '{0} is missing the implementation of the test_func() method.'.format(self.__class__.__name__)
+            '{} is missing the implementation of the test_func() method.'.format(self.__class__.__name__)
         )
 
     def get_test_func(self):
diff --git a/django/template/defaulttags.py b/django/template/defaulttags.py
index 602e8b2a15..d010bc7560 100644
--- a/django/template/defaulttags.py
+++ b/django/template/defaulttags.py
@@ -970,7 +970,7 @@ def do_if(parser, token):
 
     # {% endif %}
     if token.contents != 'endif':
-        raise TemplateSyntaxError('Malformed template tag at line {0}: "{1}"'.format(token.lineno, token.contents))
+        raise TemplateSyntaxError('Malformed template tag at line {}: "{}"'.format(token.lineno, token.contents))
 
     return IfNode(conditions_nodelists)
 
diff --git a/django/test/client.py b/django/test/client.py
index 0a683f5026..34fc9f3cf1 100644
--- a/django/test/client.py
+++ b/django/test/client.py
@@ -656,7 +656,7 @@ class Client(RequestFactory):
         if not hasattr(response, '_json'):
             if not JSON_CONTENT_TYPE_RE.match(response.get('Content-Type')):
                 raise ValueError(
-                    'Content-Type header is "{0}", not "application/json"'
+                    'Content-Type header is "{}", not "application/json"'
                     .format(response.get('Content-Type'))
                 )
             response._json = json.loads(response.content.decode(response.charset), **extra)
diff --git a/tests/admin_widgets/tests.py b/tests/admin_widgets/tests.py
index 7aa597a87d..2bbf176ec3 100644
--- a/tests/admin_widgets/tests.py
+++ b/tests/admin_widgets/tests.py
@@ -883,7 +883,7 @@ class DateTimePickerSeleniumTests(AdminWidgetSeleniumTestCase):
 
             # Get the expected caption
             may_translation = month_name
-            expected_caption = '{0:s} {1:d}'.format(may_translation.upper(), 1984)
+            expected_caption = '{:s} {:d}'.format(may_translation.upper(), 1984)
 
             # Test with every locale
             with override_settings(LANGUAGE_CODE=language_code, USE_L10N=True):
diff --git a/tests/db_functions/models.py b/tests/db_functions/models.py
index 083655e80f..0deea8f54c 100644
--- a/tests/db_functions/models.py
+++ b/tests/db_functions/models.py
@@ -49,7 +49,7 @@ class DTModel(models.Model):
     duration = models.DurationField(null=True, blank=True)
 
     def __str__(self):
-        return 'DTModel({0})'.format(self.name)
+        return 'DTModel({})'.format(self.name)
 
 
 class DecimalModel(models.Model):
diff --git a/tests/gis_tests/gdal_tests/test_raster.py b/tests/gis_tests/gdal_tests/test_raster.py
index a8801e88dd..f3477181b4 100644
--- a/tests/gis_tests/gdal_tests/test_raster.py
+++ b/tests/gis_tests/gdal_tests/test_raster.py
@@ -319,7 +319,7 @@ class GDALRasterTests(SimpleTestCase):
             return
         gdalinfo = """
         Driver: GTiff/GeoTIFF
-        Files: {0}
+        Files: {}
         Size is 163, 174
         Coordinate System is:
         PROJCS["NAD83 / Florida GDL Albers",
diff --git a/tests/template_tests/templatetags/custom.py b/tests/template_tests/templatetags/custom.py
index eaaff193ee..a5e1b33c67 100644
--- a/tests/template_tests/templatetags/custom.py
+++ b/tests/template_tests/templatetags/custom.py
@@ -153,13 +153,13 @@ simple_tag_without_context_parameter.anything = "Expected simple_tag_without_con
 @register.simple_tag(takes_context=True)
 def escape_naive(context):
     """A tag that doesn't even think about escaping issues"""
-    return "Hello {0}!".format(context['name'])
+    return "Hello {}!".format(context['name'])
 
 
 @register.simple_tag(takes_context=True)
 def escape_explicit(context):
     """A tag that uses escape explicitly"""
-    return escape("Hello {0}!".format(context['name']))
+    return escape("Hello {}!".format(context['name']))
 
 
 @register.simple_tag(takes_context=True)