Gregory Ewing wrote:
> Ethan Furman wrote:
>> And the thing going on is the normal python behavior (in
>> __getattribute__, I believe) of examining the returned attribute to see
>> if it is a descriptor, and if so invoking it.
>
> Only if you look it up through the instance, though.
> Normally, if you look up an attribute on a class,
> the descriptor protocol doesn't get triggered.
Since this whole thread is about giving instances their own individual
__call__ methods, I don't think that doing the look-up on the class is part
of the requirements :-)
This seems to work for me:
class call_instance(object):
def __get__(self, obj, cls=None):
if cls is None: cls = type(obj)
if obj is None: obj = cls
return obj.my_call
class SomeClass(object):
__call__ = call_instance()
a = SomeClass()
b = SomeClass()
c = SomeClass()
c.eggs = 23
from types import MethodType
a.my_call = lambda x, y=1: x/y
b.my_call = lambda spam: str(spam).upper()
c.my_call = MethodType(lambda self: self.eggs + 1, c)
--
Steven
--
https://mail.python.org/mailman/listinfo/python-list
