Type AttributeInheritance

 object --+    
          |    
Inheritance --+
              |
             AttributeInheritance

Known Subclasses:

Locale, LocaleCalendar, LocaleDates, LocaleDisplayNames, LocaleFormatLength, LocaleInheritanceStub, LocaleNumbers, LocaleOrientation

Implementation of locale inheritance for attributes.

 >>> from zope.i18n.locales.tests.test_docstrings import \
 ...     LocaleInheritanceStub

 >>> root = LocaleInheritanceStub()
 >>> root.data = 'value'
 >>> root.attr = 'bar value'
 >>> root.data2 = AttributeInheritance()
 >>> root.data2.attr = 'value2' 

 >>> locale = LocaleInheritanceStub(root)
 >>> locale.attr = 'foo value'
 >>> locale.data2 = AttributeInheritance()

 Here is an attribute lookup directly from the locale ...

 >>> locale.data
 'value'
 >>> locale.attr
 'foo value'

 ... however, we can also have any amount of nesting.

 >>> locale.data2.attr
 'value2'

 Once we have looked up a particular attribute, it should be cached,
 i.e. exist in the dictionary of this inheritance object.

 >>> 'attr' in locale.data2.__dict__
 True
 >>> locale.data2.__dict__['attr']
 'value2'

 Make sure that None can be assigned as value as well.

 >>> locale.data2.attr = None
 >>> locale.data2.attr is None
 True