Index: Lib/os.py
===================================================================
--- Lib/os.py	(revision 42726)
+++ Lib/os.py	(working copy)
@@ -403,6 +403,13 @@
 else:
     import UserDict
 
+    def setenv(key, value):
+        """setenv(key, value)
+
+        To provide consistency with the rest of the functions. This
+        function simply calls putenv() with the same values."""
+        putenv(key, value)
+
     # Fake unsetenv() for Windows
     # not sure about os2 here but
     # I'm guessing they are the same.