Hi Steven,
I too am just learning about metaclasses in Python and I found the
example you posted to be excellent.
I played around with it and noticed that the issue seems to be the
double-underscore in front of the fields (cls.__fields = {}). If you
change this parameter to use the single-underscore, the code works
perfectly.
I think that because of the double-underscore, the name of the attribute
"fields" gets mangled by the interpreter and is not inherited from the
parent class in its accessible form. Now, I am not sure if the code
posted uses an earlier version of Python where these rule are different
or if there is a more correct way to achieve this. I will follow this
discussion to see if someone has a better answer.
-victor
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