from zope.annotation.interfaces import IAnnotations from zope.interface import implementer @implementer(IAnnotations) class MyClass: def __init__(self): self.annotations = {} obj = MyClass() obj.annotations['foo'] = 'bar' assert obj.annotations.get('foo') == 'bar'
from zope.annotation.interfaces import IAnnotations from zope.interface import implements from persistent import Persistent class MyClass(Persistent): implements(IAnnotations) obj = MyClass() annotations = IAnnotations(obj) annotations['foo'] = 'bar' assert annotations.get('foo') == 'bar'In this example, we subclass the `persistent.Persistent` class to create a persistent object that can be stored in a database. We then implement the IAnnotations interface using the `zope.interface.implements` decorator. We then instantiate the class and use the `zope.annotation.interfaces.IAnnotations` function to retrieve the annotations dictionary for the object. We add an annotation to the object and retrieve it to confirm that it was successfully added. Overall, the zope.annotation.interfaces package library provides a useful tool for adding metadata to objects in a flexible and scalable way.