On 19/06/16 20:29, Arpit Merchant wrote:
Hello,
AttributeError: 'CenterSkewPolynomialRing_with_category' object
has no attribute 'element_class'
is due to some bad initialization. There should be an attribute
"Element" defined on the parent before calling the "Parent"
constructor. In other words, you should follow the following
pattern
1 class MyElement(Element):
2 ...
3
4 class MyParent(Parent):
5 Element = MyElement
6
7 def __init__(self, ...):
8 ...
9 Parent.__init__(self, ...)
I'm not sure I understand what you mean. Could you please elaborate
a little?
The attribute `element_class` of parents is created during the parent
constructor, i.e. the __init__. It creates with dynamical inheritance a
new class "element_class" which will inherits new methods depending of
the category of your parent.
In order to work, there should be an attribute "Element" available (line
5 in the above snippet). Your
class `CenterSkewPolynomialRing` is a parent that modelizes a set. It
either inherits from Parent, or Ring or something similar. And the
objects that belong to it should inherit from Element or RingElement or
something similar.
Is it better?
Vincent
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