Hello, There is a weirdness in the initialization of Parent with a facade. Consider the following example
class MySet(Parent): def __init__(self): Parent.__init__(self, category=(FiniteEnumeratedSets(), Monoids())) The category of an instance of MySet is just a join of the two categories. When I add a facade argument to the initialization of Parent as in class MyFacadeSet(Parent): def __init__(self): Parent.__init__(self, category=(FiniteEnumeratedSets(), Monoids()), facade=FreeMonoid(2, 'ab')) I got the error "AttributeError: 'tuple' object has no attribute 'is_subcategory'". It is few lines in Parent.__init__ but I suspect that some ticket solves the problem yet. Does anybody know what should I do? Best, 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.