Characteristic doesn't appear to work with inheritance

[ctoth]

I'm willing to hack on this if you have a roadmap for it, or maybe I'm just doing something wrong!

[hynek]

I’m not exactly sure, what you mean by not working, but would you mind looking at my fork attrs whether it does what you need (see the example in http://attrs.readthedocs.org/en/latest/examples.html#basics) ? I just worked on inheritance there (I personally consider subclassing a mistake, so it’s mostly working by guessing).

[ctoth]

I totally agree with you -- it's a code smell. Sadly, I'm in the middle of porting a large old C++ codebase to Python. Characteristic would make my life a heck of a lot easier, and debugging a lot more pleasant, but the code in question makes use of inheritance.

On the new-style branch, I tried:

from characteristic import attributes, Attribute

@attributes
class SpaceObject(object):
    name = Attribute()

@attributes
class Ship(SpaceObject):
    hull_points = Attribute()

ship = Ship(name="Heart of Gold", hull_points=42)

To which I got ValueError: Missing keyword value for 'name'.

This makes me sad. Any possibility of supporting this use case?

[hynek]

Please really have a look at http://attrs.readthedocs.org/en/latest/examples.html#basics a first alpha is out and you have the chance to affect it before I freeze the behavior. :)

[ctoth]

Pardon my dumb. Attrs does indeed handle this use case properly. Thank you very much, and I apologize for taking up your time.

On 3/10/2015 3:33 AM, Hynek Schlawack wrote:

Please really have a look at http://attrs.readthedocs.org/en/latest/examples.html#basics a first alpha is out and you have the chance to affect it before I freeze the behavior. :)

— Reply to this email directly or view it on GitHub https://github.com/hynek/characteristic/issues/32#issuecomment-78020797.

    -Q

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