Removed obsolete (since Python 2.3) __safe_for_unpickling__ attribute.

django/db/models/query_utils.py

@@ -301,11 +301,6 @@ def deferred_class_factory(model, attrs):
         return type(str(name), (model,), overrides)
 
 
-# The above function is also used to unpickle model instances with deferred
-# fields.
-deferred_class_factory.__safe_for_unpickling__ = True
-
-
 def refs_aggregate(lookup_parts, aggregates):
     """
     A helper method to check if the lookup_parts contains references

django/utils/functional.py

@@ -314,7 +314,6 @@ def unpickle_lazyobject(wrapped):
     wrapped object.
     """
     return wrapped
-unpickle_lazyobject.__safe_for_unpickling__ = True
 
 
 # Workaround for http://bugs.python.org/issue12370