[Python-Dev] PEP 203 Augmented Assignment
Moshe Zadka
Moshe Zadka <moshez@math.huji.ac.il>
Fri, 28 Jul 2000 08:49:30 +0300 (IDT)
On Thu, 27 Jul 2000, Guido van Rossum wrote:
> Another solution: require a class variable to indicate the class's
> awareness: e.g. you must define __getslice_takes_three_args__ when
> __getslice__(lo, hi, step) is supported, otherwise the call goes to
> __getitem__(slice(lo, hi, step)).
I don't think it can work: what about inheritance? Think of these
two cases:
class A:
__getslice_takes_3_args__
def __getslice__(...):
...
class B(A):
def __getslice__(...):
... # something completely different
and
class C(A):
def __getslice__(self, *args):
# do something
apply(A.__getslice__, (self,)+args)
> This is a bit like the feature flag bits in the type struct.
Which are ugly as hell too.....and only work because builtin types
have a flat inheritance.
oh-well-python-3000-is-just-around-the-corner-ly y'rs, Z.
--
Moshe Zadka <moshez@math.huji.ac.il>
There is no IGLU cabal.
http://advogato.org/person/moshez