Fixed #30234 -- Disallowed non-upper settings in settings.configure().

1 files changed, 3 insertions, 1 deletions

diff --git a/django/conf/__init__.py b/django/conf/__init__.py
index 608ad256dc..3337fd6f13 100644
--- a/django/conf/__init__.py
+++ b/django/conf/__init__.py
@@ -104,6 +104,8 @@ class LazySettings(LazyObject):
             raise RuntimeError('Settings already configured.')
         holder = UserSettingsHolder(default_settings)
         for name, value in options.items():
+            if not name.isupper():
+                raise TypeError('Setting %r must be uppercase.' % name)
             setattr(holder, name, value)
         self._wrapped = holder
 
@@ -198,7 +200,7 @@ class UserSettingsHolder:
         self.default_settings = default_settings
 
     def __getattr__(self, name):
-        if name in self._deleted:
+        if not name.isupper() or name in self._deleted:
             raise AttributeError
         return getattr(self.default_settings, name)