On Wed, 28 Jun 2000, Andrew Kuchling wrote:
> You could imagine a Python implementation that added flag
> bits to every object, and set a bit if there was a __getattr__ method
> defined; code could then do 'if (obj->flags & GMAGICAL) ...' instead
> of the more complicated 'if (PyObject_HasAttrString(obj,
> "__getattr__")'.
That looks like a reasonable sort of optimization to me, though
as far as i can tell it looks like that optimization has already
been done:
in PyClass_New(bases, dict, name):
[...]
op->cl_getattr = class_lookup(op, getattrstr, &dummy);
[...]
in instance_getattr(inst, name):
if (res == NULL && (func = inst->in_class->cl_getattr) != NULL) {
[...special __getattr__ handling...]
}
In general, optimizations of the form "add a flag to avoid a
frequent expensive test" seem okay to me, as long they are a
demonstrable win and the flag can be given a clear, simple name.
-- ?!ng
"To be human is to continually change. Your desire to remain what
you are is what ultimately limits you."
-- The Puppet Master, Ghost in the Shell
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