[Pyrex] difficulty while importing extension class

[Sat Tara Singh]

Thanks. This Windog user stands corrected - all I had to do was update Pyrex.



Sat Tara Singh wrote:

> > Greetings,
> >
> > I've been working on a Python project with a cellular automaton engine 
> > at its core, and have been busy developing this engine in Pyrex. I ran 
> > into an unexpected situation yesterday.
> >
> > I have compiled a .pyd file name "topology" with an extension class 
> > called Topology.
> >
> > I then tried to use this extension class in a different Pyrex module 
> > named "neighborhood".
> >
> > Here's the code:
> >
> > ############################
> >
> > cimport topology as T
> >
> > cdef class Thing:
> >      cdef T.Topology topo
> >
> >      def __init__(self):
> >           self.topo = T.Topology((100,100),2)
> >
> > ############################
> >
> > When I tried to compile this I got the following error message:
> >
> > error: lvalue required as left operand of assignment
> >
> > So, I looked at the line in the .c file which had raised this error and 
> > it read as follows:
> >
> > ((PyObject *)((struct __pyx_obj_12neighborhood_Thing 
> > *)__pyx_v_self)->topo) = __pyx_3;
> >
> > Having no idea what this means, I did a Google search, read a bug report 
> > by Dmitry Marakasov, and changed the code to this:
> >
> > __pyx_v_self = (struct __pyx_obj_12neighborhood_Thing *)__pyx_3;
> >
> > This compiled successfully and ran without problems.
> >
> > Happy as I was to see it work, I'm totally befuddled as to what I did, 
> > and decidedly unwilling to dive into C code I'm too dumb to understand 
> > every time I want to use an extension class in my project. I wonder if 
> > anybody has any feedback on this.
> >
> > I'm running Pyrex 0.9.3.1 for Windows on a WindowsXP box, under Python 
> > 2.5, and using MinGW's gcc as a compiler.
> >
> >   
>   

This is an older version of Pyrex. It has known issues with newer C 
compilers. Upgrade to the latest Pyrex version.

-- Lenard Lindstrom <len-l at telus.net> 
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