Implemented thread-local data as proposed on python-dev:

http://mail.python.org/pipermail/python-dev/2004-June/045785.html

Lib/threading.py

@@ -15,7 +15,7 @@ from collections import deque
 # Rename some stuff so "from threading import *" is safe
 __all__ = ['activeCount', 'Condition', 'currentThread', 'enumerate', 'Event',
            'Lock', 'RLock', 'Semaphore', 'BoundedSemaphore', 'Thread',
-           'Timer', 'setprofile', 'settrace']
+           'Timer', 'setprofile', 'settrace', 'local']
 
 _start_new_thread = thread.start_new_thread
 _allocate_lock = thread.allocate_lock
@@ -661,6 +661,14 @@ def enumerate():
 
 _MainThread()
 
+# get thread-local implementation, either from the thread
+# module, or from the python fallback
+
+try:
+    from thread import _local as local
+except ImportError:
+    from _threading_local import local
+
 
 # Self-test code