implemented __getslice__ for the XPathSelectorList, still broken when using step-slices

--HG--
extra : convert_revision : svn%3Ab85faa78-f9eb-468e-a121-7cced6da292c%4094

scrapy/trunk/scrapy/xpath/selector.py

@@ -86,6 +86,9 @@ class XPathSelector(object):
 class XPathSelectorList(list):
     """List of XPathSelector objects"""
 
+    def __getslice__(self, i, j):
+        return XPathSelectorList(list.__getslice__(self, i, j))
+
     def x(self, xpath):
         """Perform the given XPath query on each XPathSelector of the list and
         return a new (flattened) XPathSelectorList of the results"""