If you use the
class MyParent(Parent)
Element = MyElement
syntax then you have to import MyElement. So you shouldn't import MyParent
in your element code or you will create a cyclic import (=bad).
Are you sure that you need to create new parents from the element? Your
element should only work with the parent that it is an element of. New
Parents are generally constructed by coercion, but the coercion code lives
in MyParent.
If all fails you can still do a method-level import. But its likely that
you should not.
On Friday, November 9, 2012 1:13:20 PM UTC-5, Charles Bouillaguet wrote:
>
> Hi,
>
> Why does adding :
>
> from sage.rings.polynomial.polynomial_ring_constructor import
> PolynomialRing
>
> at the beginning of quotient_ring_element.py create the weird error:
>
> Traceback (most recent call last):
> …
> AttributeError: 'module' object has no attribute 'quotient_ring'
>
> Is there a circular dependency problem? If so, how can I possibly create
> polynomial rings inside quotient_ring_element ???
>
> Cheers,
> ----
> Charles Bouillaguet
> http://www.lifl.fr/~bouillaguet/
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