Access to C functions from a python class using self ?
christophe grimault
christophe.grimault at novagrid.com
Mon Dec 30 06:59:16 EST 2002
Hi there,
I've been looking to 'ext & emb python', swig, cxx, ... for quite some
time now, and I still can't figure out how to do the kind of stuff
explained below...
I define a class in python, let's say this simple class, just for the
purpose of discussion :
class Vector:
def __init__(self, x1, x2, x3):
self.x1, self.x2, self.x3 = x1, x2, x3
def sum(self):
return self.x1 + self.x2 + self.x3
Now, I find that sum is slow, and I want to speedup things by replacing
sum by a call to C.
Looking at the manual, I can write something like:
static PyObject *sum( PyObject *self, PyObject *args )
and the manual tells me how to access elements passed in args, but does
not tell how to access elements (in fact attributes) of self. How can I
retrieve self.x1, self.x2, and self.x3 as defined in the python class
from *self passed to the C function ?
The goal for me is to create classes quickly in Python. These classes
have, say, a constructor and 5 to 30 methods. The object itself is quite
complex (lots of attributes of different types) and only one or two
method need very high speed and thus, must call C.
And i want to avoid passing all the attributes needed by those C calls
by increasing the *args !
Any help would be appreciated !
Christophe
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