[6.0.x] Fixed #36961 -- Fixed TypeError in deprecation warnings if Django is imported by namespace.

Backport of c1d8646ec219b8b90ebdd463f40e5767876658a0 from main.

3 files changed, 9 insertions, 3 deletions

diff --git a/django/utils/deprecation.py b/django/utils/deprecation.py
index eea24cf94b..11a37f05bc 100644
--- a/django/utils/deprecation.py
+++ b/django/utils/deprecation.py
@@ -12,9 +12,8 @@ from django.utils.inspect import signature
 
 @functools.cache
 def django_file_prefixes():
-    try:
-        file = django.__file__
-    except AttributeError:
+    file = getattr(django, "__file__", None)
+    if file is None:
         return ()
     return (os.path.dirname(file),)
 
diff --git a/docs/releases/6.0.3.txt b/docs/releases/6.0.3.txt
index 048921db8b..8777b1ef21 100644
--- a/docs/releases/6.0.3.txt
+++ b/docs/releases/6.0.3.txt
@@ -17,6 +17,9 @@ Bugfixes
   to :ref:`override<tuple-for-params>` ``as_sql()`` to accept any sequence
   (:ticket:`36934`).
 
+* Fixed :exc:`TypeError` when deprecation warnings are emitted in environments
+  importing Django by namespace (:ticket:`36961`).
+
 * Fixed a visual regression where fieldset legends were misaligned in the admin
   (:ticket:`36920`).
 
diff --git a/tests/deprecation/tests.py b/tests/deprecation/tests.py
index 2df9cc6fa2..ac610b4928 100644
--- a/tests/deprecation/tests.py
+++ b/tests/deprecation/tests.py
@@ -18,6 +18,10 @@ class DjangoFilePrefixesTests(SimpleTestCase):
     def test_no_file(self):
         orig_file = django.__file__
         try:
+            # Depending on the cwd, Python might give a local checkout
+            # precedence over installed Django, producing None.
+            django.__file__ = None
+            self.assertEqual(django_file_prefixes(), ())
             del django.__file__
             self.assertEqual(django_file_prefixes(), ())
         finally: