[Zope] Error when trying to add properties in python script

[Robert Rottermann]

Hi there,

I want to create an programaticaly and then set some attributes.

While creating a property works fine, I can not access it afterwards.

The following code:

context.invokeFactory('PortalFolder', 'an_id')
obj = context[str_id]
obj.manage_addProperty("alter", 21, int)
obj.manage_changeProperties({"alter": 21})

produces the following error:

Error Type: TypeError
Error Value: int requires exactly 1 argument; 0 given


Where do I err?

Thanks for any tips

Robert