[Python-Dev] Dictionary subclasses and exec

[Fred L. Drake, Jr.]

akuchlin@mems-exchange.org writes:
 > Oh, well; I need to come up with a different example for subclassing a
 > built-in type, then.  Thanks!   <puts on thinking cap>

Andrew,
  You can take a look at that implementation of
xml.dom.minidom.NodeList; for Python 2.2, the implementation goes like
this:

----------------------------------------------------------------------
class NodeList(list):
    def item(self, index):
        if 0 <= index < len(self):
            return self[index]

    length = property(lambda self: len(self),
                      doc="The number of nodes in the NodeList.")
----------------------------------------------------------------------


  -Fred

-- 
Fred L. Drake, Jr.  <fdrake at acm.org>
PythonLabs at Zope Corporation