The "modern" way to define a Parent class is as follows:

class MyParent(Parent):
    Element = MyElement
    def __init__(self):
        Parent.__init__(self, category=MyCategory())

One thing which surprises me is that the code to have the "Element = MyElement" trick work is implemented in the category of Sets. It seems to me that this should really be part of the general Parent infrastructure, independent of categories.

So, is there any particular reason why this is implemented in Sets? Are there any objections to changing that?


Jeroen.

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