diff --git a/django/core/handlers/modpython.py b/django/core/handlers/modpython.py
index 1520bd3be2..59909fb803 100644
--- a/django/core/handlers/modpython.py
+++ b/django/core/handlers/modpython.py
@@ -103,7 +103,7 @@ class ModPythonRequest(httpwrappers.HttpRequest):
                 if not user_id:
                     raise ValueError
                 self._user = User.objects.get_object(pk=user_id)
-            except (AttributeError, KeyError, ValueError, user.DoesNotExist):
+            except (AttributeError, KeyError, ValueError, User.DoesNotExist):
                 from django.parts.auth import anonymoususers
                 self._user = anonymoususers.AnonymousUser()
         return self._user
diff --git a/django/core/handlers/wsgi.py b/django/core/handlers/wsgi.py
index c9d5011c3f..1f5d5ea2d3 100644
--- a/django/core/handlers/wsgi.py
+++ b/django/core/handlers/wsgi.py
@@ -124,7 +124,7 @@ class WSGIRequest(httpwrappers.HttpRequest):
                 if not user_id:
                     raise ValueError
                 self._user = User.objects.get_object(pk=user_id)
-            except (AttributeError, KeyError, ValueError, user.DoesNotExist):
+            except (AttributeError, KeyError, ValueError, User.DoesNotExist):
                 from django.parts.auth import anonymoususers
                 self._user = anonymoususers.AnonymousUser()
         return self._user
diff --git a/django/models/core.py b/django/models/core.py
index 33ac1808e8..99c617065e 100644
--- a/django/models/core.py
+++ b/django/models/core.py
@@ -81,12 +81,12 @@ class SessionManager(models.Manager):
             session_key = md5.new(str(random.randint(0, sys.maxint - 1)) + SECRET_KEY).hexdigest()
             try:
                 self.get_object(session_key__exact=session_key)
-            except SessionDoesNotExist:
+            except self.klass.DoesNotExist:
                 break
         return session_key
 
     def save(self, session_key, session_dict, expire_date):
-        s = self.klass(session_key, encode(session_dict), expire_date)
+        s = self.klass(session_key, self.encode(session_dict), expire_date)
         if session_dict:
             s.save()
         else: