noteannotableadapter.py

from noteannotation import NoteAnnotation
from zope.annotation.interfaces import IAnnotations 

from interfaces import noteannotationkey, INoteAnnotation

def NoteAnnotableAdapter(context) :
    annotations = IAnnotations(context)

    try :
        na = annotations[noteannotationkey]
    except KeyError :
        na = annotations[noteannotationkey] = NoteAnnotation()

    return INoteAnnotation(na)