plone - zope.annotation example in documentation fails. Help needed to correct it -

i trying understand annotations document:

http://docs.zope.org/zope.annotation/index.html

however example fails when run.

i get:

traceback (most recent call last):   file "./zopepy", line 366, in <module>     exec(compile(__file__f.read(), __file__, "exec"))   file "test1.py", line 29, in <module>     bar = ibar(foo)   file "eggs/zope.component-3.9.5-py2.7.egg/zope/component/_api.py", line 156, in adapter_hook     return sitemanager.queryadapter(object, interface, name, default)   file "eggs/zope.component-3.9.5-    py2.7.egg/zope/component/registry.py", line 228, in queryadapter     return self.adapters.queryadapter(object, interface, name, default)   file "eggs/zope.annotation-3.5.0-py2.7.egg/zope/annotation/factory.py", line 42, in getannotation     annotations = zope.annotation.interfaces.iannotations(context) typeerror: ('could not adapt', <__main__.foo object @ 0xb6d6956c>,    <interfaceclass zope.annotation.interfaces.iannotations>) 

example missing following statements:

from zope.annotation.attribute import attributeannotations provideadapter(attributeannotations)