[Pyrex] Circular cimports

[Mike Wyatt]

I'm building a little math library in Pyrex, and I'm having trouble with 
some circular cimports.  I'll post short excerpts from my various files, 
then show the error that I'm getting when I try to use one of the modules.

***matrix.pxd**
*cdef class Matrix:
    cdef float m[4][4]

***matrix.pyx**
*cimport vector

cdef class Matrix:
    ### a bunch of methods, including ones that create or manipulate 
Vector objects ###

***vector.pxd**
*cdef class Vector:
    cdef float x, y, z, w

***vector.pyx***
cimport matrix

cdef class Vector:
    ### a bunch of methods, including one that has a Matrix argument ###

After building the Pyrex modules into .pyd files, I run a test module.  
The first line imports the matrix module and throws this error:

Traceback (most recent call last):
  File "C:\Development\SFStratPrototype\math3d\matrixTest.py", line 1, in ?
    import matrix
  File "vector.pxd", line 1, in matrix
    cdef class Vector:
  File "matrix.pxd", line 1, in vector
    cdef class Matrix:
AttributeError: 'module' object has no attribute 'Matrix'
Press any key to continue . . .

It doesn't seem to like how the modules cimport each other.  I can't see 
any way to eliminate this circular reference, so what can I do to fix 
this error?

- Mike Wyatt
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