Simon,

For further advice on setting up to test new code, take a look at

http://tinyurl.com/d92o3v

Rob

On Mar 7, 12:10 am, Simon King <k...@mathematik.uni-jena.de> wrote:
> Hi!
>
> I would like to create an extension class that inherits from
> CommutativeRingElement. In order to learn how it works, I looked at
> the file sage/rings/polynomial/multi_polynomial.pyx and ...pxd
>
> However, the whole story fails at a *very* basic level: Just for
> testing, I copied both files multi_polynomial.pyx and
> multi_polynomial.pxd into some directory, and in this directory I said
>  sage: attach multi_polynomial.pyx
>
> It failed in the line
>    cdef class MPolynomial(CommutativeRingElement):
> with the message
>    'CommutativeRingElement' is not declared
>
> Why?
>
> Is 'attach' the wrong thing to do if there is a .pxd file around?
>
> Cheers,
>      Simon
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