I am trying to build a class which derives from Parent and QuotientRing_nc
at the same time. Here is a minimal example:
sage: from sage.structure.parent import Parent
sage: from sage.categories.all import Category, FiniteEnumeratedSets,
CommutativeRings
sage: from sage.rings.quotient_ring import QuotientRing_nc
sage: from sage.structure.unique_representation import UniqueRepresentation
sage: class Y(Parent):
....: def __init__(self):
....: from sage.rings.finite_rings.integer_mod_ring import
Integers
....: V = Integers()**2
....: Parent.__init__(self, Integers(), gens=(V.gen(0),
V.gen(1)),names=('a', 'b'))
sage: class X(Y, QuotientRing_nc):
....: def __init__(self):
....: Y.__init__(self)
sage: X()
TypeError: _assign_names() got an unexpected keyword argument 'ngens'
Is there a reason why I should not be allowed to inherit from both classes
at the same time?
Or is this a bug? Then the method
*sage.structure.parent_gens.ParentWithGens._assign_names*
should be modified such that it accepts the keyword 'ngens'.
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