Python 3.3 compatibility.

CHANGES.txt

@@ -4,7 +4,7 @@ Changes
 1.2.1 (unreleased)
 ------------------
 
-- ...
+- Python 3.3 compatibility.
 
 1.2.0 (2011-12-05)
 ------------------

transaction/compat.py

@@ -78,7 +78,10 @@ else: # pragma: no cover
 
 
 if PY3:
-    from threading import _get_ident as get_thread_ident
+    try:
+        from threading import get_ident as get_thread_ident
+    except ImportError:
+        from threading import _get_ident as get_thread_ident
 else:
     from thread import get_ident as get_thread_ident