Something like this would be especially helpful for classes using __slots__. 

The member objects show-up in help(), but there is no way to attach an explanation like we can with property objects.

So there is a slots only alternative that would only involve modifying help() and nothing else:

   class Bicycle:

       __slots__ = dict(
           category = 'Primary use: road, cross-over, or hybrid',
           model = 'Unique six digit vendor-supplied code',
           size = 'Rider size: child, small, medium, large, extra-large',
           price = 'Manufacturer suggested retail price', 
       )