[Zope] Classes in PythonScripts

[Gerald Gutierrez]

Hi all. I just tried to write a class in PythonScripts, and came up against 
a problem. The class is:

class Alpha:
   alpha = 0

   def set(self, alpha):
     this.alpha = alpha

It seems that PythonScripts does not like this. Am I not supposed to be 
able to define classes?