1 files changed, 7 insertions, 6 deletions
diff --git a/django/contrib/admin/forms.py b/django/contrib/admin/forms.py
index ee275095e3..bbb072bdb2 100644
--- a/django/contrib/admin/forms.py
+++ b/django/contrib/admin/forms.py
@@ -7,24 +7,25 @@ class AdminAuthenticationForm(AuthenticationForm):
     """
     A custom authentication form used in the admin app.
     """
+
     error_messages = {
         **AuthenticationForm.error_messages,
-        'invalid_login': _(
+        "invalid_login": _(
             "Please enter the correct %(username)s and password for a staff "
             "account. Note that both fields may be case-sensitive."
         ),
     }
-    required_css_class = 'required'
+    required_css_class = "required"
 
     def confirm_login_allowed(self, user):
         super().confirm_login_allowed(user)
         if not user.is_staff:
             raise ValidationError(
-                self.error_messages['invalid_login'],
-                code='invalid_login',
-                params={'username': self.username_field.verbose_name}
+                self.error_messages["invalid_login"],
+                code="invalid_login",
+                params={"username": self.username_field.verbose_name},
             )
 
 
 class AdminPasswordChangeForm(PasswordChangeForm):
-    required_css_class = 'required'
+    required_css_class = "required"