I don't know if there's a ticket, but one way to fix it is to make the
following two lines of parent.Parent.__init__
else:
category = Category.join((category, Sets().Facades()))
into
if category is None:
category = Sets().Facades()
else:
if isinstance(category, (list, tuple)):
category = Category.join(tuple(category) +
(Sets().Facades(),))
else:
category = Category.join((category, Sets().Facades()))
David
On Sun, Aug 19, 2012 at 12:54 PM, Vincent Delecroix
<20100.delecr...@gmail.com> wrote:
> 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
>
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