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

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

Lib/test/test_threading_local.py

@@ -0,0 +1,26 @@
+import unittest
+from doctest import DocTestSuite
+from test import test_support
+
+def test_main():
+    suite = DocTestSuite('_threading_local')
+
+    try:
+        from thread import _local
+    except ImportError:
+        pass
+    else:
+        import _threading_local
+        local_orig = _threading_local.local
+        def setUp():
+            _threading_local.local = _local
+        def tearDown():
+            _threading_local.local = local_orig
+        suite.addTest(DocTestSuite('_threading_local',
+                                   setUp=setUp, tearDown=tearDown)
+                      )
+
+    test_support.run_suite(suite)
+
+if __name__ == '__main__':
+    test_main()