[Nipy-devel] help with attributes

[Brian Hawthorne]

>
> > from attributes import readonly
> > class Test (object):
> >     class x (readonly): default=4.
> >
> > d = Test()
> > d.x = 3.
> > d.y = 4.
> >
>
> Yes, but it won't fail with
>
> d.x = 'a'
>
> which is the commented out example in my script, i.e. there is no type
> checking, which I think is another nice feature of traits.


Attributes do perform (duck-)type checking. It will fail on d.x='a', because
if a default value is specified, but no type is specified, an attribute
takes the type of its default (in this case a float, which is why I put a
period after the 4).  I do encourage everyone to take a look at the
mini-tutorial doctest:
http://neuroimaging.scipy.org/api/attributes-module.html

- Brian
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