[Zope-dev] Publisher and callable objects

[cpita]

Hi, I'm a very new Zope-Python programmer but I have 
been reading many tutorials, 
references and howtos since last month.
 
Last night I was spying the DocumentTemplate package, 
and in the String module
I found some code that was intended to make the DT 
appear as a function to the
Publisher. I can't exactly remember, but the idea was 
to add a func_code attribute
with no bytecode and requesting the 2 arguments REQUEST 
and self.
So, implementing the special __call__ method, Publisher 
calls the DT as
it would call a function expecting those arguments. I 
get the idea, but what I can't see is:
 
Is this clean? I mean, if the Publisher is assuming 
that the DT is really a function 
it could try to access other functionality function 
objects have. Is it stated somewhere
that Publisher (once it knows that it's working with a 
callable object) only uses the func_code
attributed and the subattributes that DT sets? Or that 
Publisher will not depend on the type
of the callable object being FunctionType, MethodType, 
etc?.
 
Thank you,
                Carlos  


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