Work around lack of '__objclass__' on instance methods in PyPy3.

zopefoundation · Dec 26, 2014 · 86e5b1d · 86e5b1d
1 parent 8af9222
commit 86e5b1d
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/BTrees/_base.py b/BTrees/_base.py
@@ -209,6 +209,10 @@ def advance(self):
 
 def _no_default_comparison(key):
     # Enforce test that key has non-default comparison.
+    if key is None:
+        raise TypeError("Can't use None as a key")
+    if type(key) is object:
+        raise TypeError("Can't use object() as keys")
     lt = getattr(key, '__lt__', None)
     if lt is not None:
         if getattr(lt, '__objclass__', None) is object: #pragma NO COVER Py3k