Am 20.04.2017 um 14:26 schrieb Steven D'Aprano:
On Thu, Apr 20, 2017 at 10:39:57AM +0200, Thomas Güttler wrote:
- its hard to get classproperty to work right.
What is "righ"?
In my case a read-only classproperty is enough. Inheritance should be
supported.
I don't have a usecase for a setter.
The standard library is not just for you :-)
If Peter's solution is "good enough" for you, then great, go ahead and
use it. But beware: of the two implementations I know, you cannot have
both:
- access from instances;
- read-only property;
You can have access from instances, but then the classproperty is not
read-only. Or you can have read-only access, but only from the class
object.
I can't follow what you. What do you mean with "... is not read-only".
This snippet works fine:
{{{
class classproperty(object):
def __init__(self, f):
self.f = f
def __get__(self, obj, owner):
return self.f(owner)
class Foo(object):
@classproperty
def my_prop(cls):
return 42
print Foo.my_prop
print Foo().my_prop
}}}
Regards,
Thomas
--
Thomas Guettler http://www.thomas-guettler.de/
_______________________________________________
Tutor maillist - Tutor@python.org
To unsubscribe or change subscription options:
https://mail.python.org/mailman/listinfo/tutor
