[6.0.x] Refs #31223 -- Added __class_getitem__() to SetPasswordMixin.

Backport of d0c8f89c942d1379724bdd37127076d13452f71d from main.

2 files changed, 6 insertions, 0 deletions

diff --git a/django/contrib/auth/forms.py b/django/contrib/auth/forms.py
index 2214e134d0..aff0cca342 100644
--- a/django/contrib/auth/forms.py
+++ b/django/contrib/auth/forms.py
@@ -134,6 +134,9 @@ class SetPasswordMixin:
             user.save()
         return user
 
+    def __class_getitem__(cls, *args, **kwargs):
+        return cls
+
 
 class SetUnusablePasswordMixin:
     """
diff --git a/tests/auth_tests/test_forms.py b/tests/auth_tests/test_forms.py
index be55c4369b..73065adddf 100644
--- a/tests/auth_tests/test_forms.py
+++ b/tests/auth_tests/test_forms.py
@@ -350,6 +350,9 @@ class BaseUserCreationFormTest(TestDataMixin, TestCase):
                     form.fields[field_name].widget.attrs["autocomplete"], autocomplete
                 )
 
+    def test_user_creation_form_class_getitem(self):
+        self.assertIs(BaseUserCreationForm["MyCustomUser"], BaseUserCreationForm)
+
 
 class CustomUserCreationFormTest(TestDataMixin, TestCase):