fix iterator in WidgetContainerListContentsMixin

  (x)range is an iterable
  __iterator__ should return an iterator (iter(iterable))

1 files changed, 2 insertions, 2 deletions

diff --git a/urwid/container.py b/urwid/container.py
index 3999f28..fdd5da4 100755
--- a/urwid/container.py
+++ b/urwid/container.py
@@ -113,14 +113,14 @@ class WidgetContainerListContentsMixin(object):
         Return an iterable of positions for this container from first
         to last.
         """
-        return xrange(len(self.contents))
+        return iter(xrange(len(self.contents)))
 
     def __reversed__(self):
         """
         Return an iterable of positions for this container from last
         to first.
         """
-        return xrange(len(self.contents) - 1, -1, -1)
+        return iter(xrange(len(self.contents) - 1, -1, -1))
 
 
 class GridFlowError(Exception):