Extending Python in C ?'s

Andrew Murray uwmurray at u.washington.edu
Fri Sep 7 09:51:36 CEST 2001


Thanks. This was exactly what I was looking for, very helpful.
"Ignacio Vazquez-Abrams" <ignacio at openservices.net> wrote in message
news:mailman.999579484.30466.python-list at python.org...
> On Mon, 3 Sep 2001, Andrew Murray wrote:
>
> > Hi,
> >
> > I'm looking into writing some types in C for use in a Python program
> > I'm working on. I've been reading and it looks really easy (especially
> > with SWIG) to create a simple type in C for use in python, but does
anybody
> > know
> > how (or can point me to a good reasource on how) to create a type in C
> > whose data members would be other types written in C? For instance, if I
> > wanted to recreate this (ficticious) type:
> >
> > Class myClass():
> >     dataMembers = []
> >     def __init__(self, integer_input):
> >         i=0
> >         while(i < integer_input):
> >             dataMembers = append(myOtherClass("hello from # " + str(i))
> >     def printMessages(self):
> >         for member in self.dataMembers:
> >             member.printMessage()
> >
> > Class myOtherClass():
> >     message = ''
> >     def __init__(self, string_input):
> >         self.message = string_input
> >     def printMessage(self):
> >         print self.message
> >
> > I hope this example is clear... Please advise
> >
> > Thanks,
> >
> > Andrew Murray
>
> For the simple case above you could have a PyObject* field in
myClassObject
> that would contain a PyListObject containing myOtherClassObject*'s casted
to
> PyObject*. Then in myClassObject_printMessages() you'd just have to use
> myOtherClassObject_Check() to verify that they're really
myOtherClassObjects,
> then call myOtherClass_printMessage() with that object and an empty tuple,
and
> throw an exception if the call returns NULL.
>
> --
> Ignacio Vazquez-Abrams  <ignacio at openservices.net>
>
>
>
>





More information about the Python-list mailing list