[Checkins] SVN: BTrees/branches/py3k/ Make the no-default-comparison check work on Py3k.

[Tres Seaver]

Log message for revision 128608:
  Make the no-default-comparison check work on Py3k.

Changed:
  _U  BTrees/branches/py3k/
  U   BTrees/branches/py3k/BTrees/_base.py

-=-
Modified: BTrees/branches/py3k/BTrees/_base.py
===================================================================
--- BTrees/branches/py3k/BTrees/_base.py	2012-12-12 14:40:53 UTC (rev 128607)
+++ BTrees/branches/py3k/BTrees/_base.py	2012-12-12 14:40:53 UTC (rev 128608)
@@ -203,6 +203,15 @@
 
         return self
 
+def _no_default_comparison(key):
+    # Enforce test that key has non-default comparison.
+    lt = getattr(key, '__lt__', None)
+    if lt is not None:
+        if getattr(lt, '__objclass__', None) is object: #pragma NO COVER Py3k
+            lt = None
+    if (lt is None and
+        getattr(key, '__cmp__', None) is None):
+        raise TypeError("Can't use default __cmp__")
 
 class Bucket(_BucketBase):
 
@@ -240,10 +249,7 @@
             raise TypeError('items must be a sequence of 2-tuples')
 
     def __setitem__(self, key, value):
-        # 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__")
+        _no_default_comparison(key)
         self._set(self._to_key(key), self._to_value(value))
 
     def __delitem__(self, key):
@@ -730,10 +736,7 @@
             set(*i)
 
     def __setitem__(self, key, value):
-        # 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__")
+        _no_default_comparison(key)
         self._set(self._to_key(key), self._to_value(value))
 
     def __delitem__(self, key):