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Recipe 576653 revision 4 

def CmpToKey(mycmp):
    'Convert a cmp= function into a key= function'
    class K(object):
        def __init__(self, obj, *args):
            self.obj = obj
        def __lt__(self, other):
            return mycmp(self.obj, other.obj) < 0
        def __gt__(self, other):
            return mycmp(self.obj, other.obj) > 0
        def __eq__(self, other):
            return mycmp(self.obj, other.obj) == 0
        def __le__(self, other):
            return mycmp(self.obj, other.obj) <= 0  
        def __ge__(self, other):
            return mycmp(self.obj, other.obj) >= 0
        def __ne__(self, other):
            return mycmp(self.obj, other.obj) != 0
    return K

Diff to Previous Revision

--- revision 3 2009-03-25 14:16:06
+++ revision 4 2010-03-31 17:05:26
@@ -4,15 +4,15 @@
         def __init__(self, obj, *args):
             self.obj = obj
         def __lt__(self, other):
-            return mycmp(self.obj, other.obj) == -1
+            return mycmp(self.obj, other.obj) < 0
         def __gt__(self, other):
-            return mycmp(self.obj, other.obj) == 1
+            return mycmp(self.obj, other.obj) > 0
         def __eq__(self, other):
             return mycmp(self.obj, other.obj) == 0
         def __le__(self, other):
-            return mycmp(self.obj, other.obj) != 1  
+            return mycmp(self.obj, other.obj) <= 0  
         def __ge__(self, other):
-            return mycmp(self.obj, other.obj) != -1
+            return mycmp(self.obj, other.obj) >= 0
         def __ne__(self, other):
             return mycmp(self.obj, other.obj) != 0
     return K

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