Fixed #31223 -- Added __class_getitem__() to Manager and QuerySet.

django/db/models/manager.py

@@ -35,6 +35,9 @@ class BaseManager:
         """Return "app_label.model_label.manager_name"."""
         return '%s.%s' % (self.model._meta.label, self.name)
 
+    def __class_getitem__(cls, *args, **kwargs):
+        return cls
+
     def deconstruct(self):
         """
         Return a 5-tuple of the form (as_manager (True), manager_class,

django/db/models/query.py

@@ -323,6 +323,9 @@ class QuerySet:
         qs._fetch_all()
         return qs._result_cache[0]
 
+    def __class_getitem__(cls, *args, **kwargs):
+        return cls
+
     def __and__(self, other):
         self._merge_sanity_check(other)
         if isinstance(other, EmptyQuerySet):