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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