[Zope] Python methods and keyword arguments

Python method: Id =simple_pym parameters: val1, val2 Python method: Id =advanced_pym parameters: self, val1, val2 DTML Method: Id: index_html <code> <dtml-var "simple_pym(12,24)"> OK! <dtml-var "simple_pym(val1=12,val2=24)"> OK! </code> DTML Method Id: index_dtml <code> <dtml-var "advanced_pym(12,24)"> OK! <dtml-var "advanced_pym(val1=12, val2=24)"> FAILS!!! Error Type: TypeError Error Value: not enough arguments; expected 3, got 0 </code> Get the problem? I want to be able to call a Python Method object using keyword arguments or whatever it's called when you include the name of the parameters as you call the object. How do I do this?? Does this apply to Python Scripts and External Methods?