diff -r 8590e9b05069 Lib/unittest/__main__.py
--- a/Lib/unittest/__main__.py	Fri Sep 28 14:40:44 2012 +0100
+++ b/Lib/unittest/__main__.py	Fri Sep 28 15:00:47 2012 +0100
@@ -2,7 +2,14 @@
 
 import sys
 if sys.argv[0].endswith("__main__.py"):
-    sys.argv[0] = "python -m unittest"
+    import os.path
+    # We change sys.argv[0] to make help message more useful
+    # use executable without path, unquoted
+    # (it's just a hint anyway)
+    # (if you have spaces in your executable you get what you deserve!)
+    executable = os.path.basename(sys.executable)
+    sys.argv[0] = executable + " -m unittest"
+    del os
 
 __unittest = True