[Zope] SyntaxError, Names starting with "_" are not allowed (__init__).

Hi I am trying to execute some example scripts found on zope.org, like this one: http://www.zope.org/Members/anthony/tree-coding-tricks and a modified version here: http://www.zope.org/Members/rscanon/dtml-tree So there's this Python script, which I added with the Product List into Zope: class _dummy: __allow_access_to_unprotected_subobjects__=1 def __init__(self, name): self.name=name But all I get after clicking into "Save Changes" is: SyntaxError, Names starting with "_" are not allowed (__init__). So how can I make theses examples work? Cheers, Marc