Abstract class

[Mr.SpOOn]

Hi,
I'm going to work on a project to represent some musical theory in
Python, in an object oriented way.

I have to manage many elements of music such as notes, intervals,
scales, chords and so on. All these elements share properties and
behavior, so what I want to do is an abstract class "Note" and other
subclasses, for example "NaturalNote", "FlatNote", "SharpNote" etc.

The idea is not original, I read it in some papers where they talk
about an implementation in smalltalk.

I want to use Python (of course) and I'd like to know what is the
practice in such a case. I mean, in python there aren't abstract
classes, but I read about some way to emulate the same behavior.

What do you suggest me?

Thanks,
Carlo