Fixed warnings if Python is run with -3.

This also adds proper hashing and comparision support to
undefined objects.

This fixes #224

3 files changed, 17 insertions, 1 deletions

diff --git a/CHANGES b/CHANGES
index 1c7caf4..01afc4e 100644
--- a/CHANGES
+++ b/CHANGES
@@ -10,6 +10,9 @@ Version 2.7.1
 - Fixed lack of Python 3 support for bytecode caches.
 - Reverted support for defining blocks in included templates as this
   broke existing templates for users.
+- Fixed some warnings with hashing of undefineds and nodes if Python
+  is run with warnings for Python 3.
+- Added support for properly hashing undefined objects.
 
 Version 2.7
 -----------
diff --git a/jinja2/nodes.py b/jinja2/nodes.py
index 81fafb8..c5697e6 100644
--- a/jinja2/nodes.py
+++ b/jinja2/nodes.py
@@ -232,6 +232,9 @@ class Node(with_metaclass(NodeType, object)):
     def __ne__(self, other):
         return not self.__eq__(other)
 
+    # Restore Python 2 hashing behavior on Python 3
+    __hash__ = object.__hash__
+
     def __repr__(self):
         return '%s(%s)' % (
             self.__class__.__name__,
diff --git a/jinja2/runtime.py b/jinja2/runtime.py
index d27ca53..7791c64 100644
--- a/jinja2/runtime.py
+++ b/jinja2/runtime.py
@@ -497,6 +497,15 @@ class Undefined(object):
     __float__ = __complex__ = __pow__ = __rpow__ = \
         _fail_with_undefined_error
 
+    def __eq__(self, other):
+        return type(self) is type(other)
+
+    def __ne__(self, other):
+        return not self.__eq__(other)
+
+    def __hash__(self):
+        return id(type(self))
+
     def __str__(self):
         return u''
 
@@ -563,7 +572,8 @@ class StrictUndefined(Undefined):
     """
     __slots__ = ()
     __iter__ = __str__ = __len__ = __nonzero__ = __eq__ = \
-        __ne__ = __bool__ = Undefined._fail_with_undefined_error
+        __ne__ = __bool__ = __hash__ = \
+        Undefined._fail_with_undefined_error
 
 
 # remove remaining slots attributes, after the metaclass did the magic they