diff -r 95902c0b991b -r 2077c8da1893 utils.py
--- a/utils.py	Fri May 23 18:35:13 2014 +0200
+++ b/utils.py	Fri Jun 27 11:48:26 2014 +0200
@@ -169,8 +169,6 @@
             id(self), self._item, self._size)
     def __len__(self):
         return self._size
-    def __nonzero__(self):
-        return self._size
     def __iter__(self):
         return repeat(self._item, self._size)
     def __getitem__(self, index):