[Checkins] SVN: BTrees/branches/pure_python/ Stab at preventing non-orderable object keys.

[Tres Seaver]

Log message for revision 128198:
  Stab at preventing non-orderable object keys.

Changed:
  _U  BTrees/branches/pure_python/
  U   BTrees/branches/pure_python/BTrees/___BTree.py

-=-
Modified: BTrees/branches/pure_python/BTrees/___BTree.py
===================================================================
--- BTrees/branches/pure_python/BTrees/___BTree.py	2012-11-08 17:26:06 UTC (rev 128197)
+++ BTrees/branches/pure_python/BTrees/___BTree.py	2012-11-08 17:26:07 UTC (rev 128198)
@@ -341,9 +341,10 @@
             set(*i)
 
     def __setitem__(self, key, value):
-        # TODO:  enforce test that key has non-default comparison?
-        #if getattr(key, '__cmp__', None) is object.__cmp__:
-        #    raise TypeError("Can't use default __cmp__")
+        # Enforce test that key has non-default comparison.
+        if ( getattr(key, '__lt__', None) is None and
+            getattr(key, '__cmp__', None) is None):
+            raise TypeError("Can't use default __cmp__")
         self._set(self._to_key(key), self._to_value(value))
 
     def __delitem__(self, key):