On Sep 10, 7:41 am, Chris <[EMAIL PROTECTED]> wrote: > Hi, > > I'd like to be able to access an attribute of a particular Python > object as fast as possible from some C code. > > I wondered if using __slots__ to store the attribute would allow me to > do this in a faster way. > > The reason I'd like to do this is because I need to access the > attribute inside a loop within some C code, and I find that the > attribute lookup using the 'PyObject_GetAttrString' call is far slower > than any of the subsequent calculations I perform in C. > > Using the 'PyObject_GetAttrString' function to get the attribute, I > find it is slightly faster when the attribute is a slot than when it > isn't, but that the attribute lookup remains the performance-limiting > factor.
You can determine the offset the of the slot in the object structure by querying the member descriptor of the type object. descr = GetAttrString(cls,"varname"); offset = descr->d_member->offset; slotvar = (PyObject*)(((char*)obj)+offset) There might be some macros to simplify this. Use at your own risk. Carl Banks -- http://mail.python.org/mailman/listinfo/python-list
