> Vincent: the behavior described in the second example on the ticket is > what it should be. The parent should override facade_for if it uses > facade=True. On the other hand, if you find it useful, you may change > the default implementation of facade_for to return a more meaningful > example and/or add appropriate cross references in the documentation.
Ok. What should return facade_for if there are infinitely many of them ? A tuple does not fit. It may be an iterator but the default constructor then fails. And I think that an AttributeError is not what it should be, I would prefer a NotImplementedError: parents for which ThisParent is a facade for are unknown (see sage.categories.facade_sets) > For the first example: probably it's category.join that should be > improved, but that will do for now. It does not as I need it ;-) As far as I understand, the problem comes from parent.pyx where it is written category = Category.join((category, Sets().Facades())) You prefer that I allow argument of Category.join to be a tuple of tuples of tuples of tuples of categories ? (one may safely use a flatten) Many thanks for clarification, Cheers, Vincent -- You received this message because you are subscribed to the Google Groups "sage-combinat-devel" group. To post to this group, send email to sage-combinat-devel@googlegroups.com. To unsubscribe from this group, send email to sage-combinat-devel+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sage-combinat-devel?hl=en.
