Hannes Grund writes:

I have an external Method which creates dynamically an instance from of a class depending on some input to a function contained in this method. In short the code (of the external method)

class Classname: .... Called from Zope this does not work. The pickle module raises an error:

The External Method documentation tells you that you may not define a class inside the the source file and return instances thereof into the Zope world. Place such classes in standard Python module files (the documentation suggests a subpackage in "Shared") and import them in your external method source file.

QUESTION 3: The lifetime of an instance has should not to be longer than the current REQUEST is performed, is there any possibility to create the instance as an subobject of the current REQUEST ?? self.REQUEST.set('xxx', <your instance>)

Dieter