Hi there again, Python and DTML Methods, one way or another they seem to be the theme for me today.. A couple of weeks ago I asked the same question (I encountered it in different circumstances). I'm trying to create a ZClass (deriving from a Python base class) that behaves like a DTML _method_. To this purpose, I tried to define this __call__: def __call__(self, client, REQUEST=None): "Call this ZClass as a DTML method." return self.render(client, REQUEST) in the base class that is inherited by a ZClass. If I grok the answers I got today by Martijn Pieters and Evan Simpson right, the arguments mean the following: self - the instance of this ZClass client - the object we're calling this method on (in my case an XML node) REQUEST - the regular request object the 'render' function figures out how to display the node (client) and returns the resulting string. This is however not working -- if I call an instance 'foo' like this on an XML node, like this: xmldoc/e7/e14/foo instead it'll display index_html (that is acquired and not defined on the ZClass). It apparently isn't calling __call__ at all. How do I fix that? Do I have to go full fledged product to do this? I'd like to use ZClasses because it's easier, but perhaps they simply don't allow it? Once I get this working I'll go back to the calling DTML Methods from Python problem again. :) Regards, Martijn