added __nonzero__ method to XPathSelector

--HG-- extra : convert_revision : svn%3Ab85faa78-f9eb-468e-a121-7cced6da292c%40298
2008-10-05 06:58:39 +00:00 · 2008-10-05 06:58:39 +00:00 · acebe63d0a
parent ac4688dabb
commit acebe63d0a
1 changed files with 3 additions and 0 deletions
--- a/scrapy/trunk/scrapy/xpath/selector.py
+++ b/scrapy/trunk/scrapy/xpath/selector.py
@ -84,6 +84,9 @@ class XPathSelector(object):
        """Register namespace so that it can be used in XPath queries"""
        self.doc.xpathContext.xpathRegisterNs(prefix, uri)

+    def __nonzero__(self):
+        return bool(self.extract())
+
    def __str__(self):
        return "<%s (%s) xpath=%s>" % (type(self).__name__, getattr(self.xmlNode, 'name', type(self.xmlNode).__name__), self.expr)