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meta.py

Some useful metaclasses.
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    A metaclass for classes that keeps track of all of them that
    aren't base classes.

    >>> Parent = LeafClassesMeta('MyParentClass', (), {})
    >>> Parent in Parent._leaf_classes
    True
    >>> Child = LeafClassesMeta('MyChildClass', (Parent,), {})
    >>> Child in Parent._leaf_classes
    True
    >>> Parent in Parent._leaf_classes
    False

    >>> Other = LeafClassesMeta('OtherClass', (), {})
    >>> Parent in Other._leaf_classes
    False
    >>> len(Other._leaf_classes)
    1
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TagRegisteredaY
    As classes of this metaclass are created, they keep a registry in the
    base class of all classes by a class attribute, indicated by attr_name.

    >>> FooObject = TagRegistered('FooObject', (), dict(tag='foo'))
    >>> FooObject._registry['foo'] is FooObject
    True
    >>> BarObject = TagRegistered('Barobject', (FooObject,), dict(tag='bar'))
    >>> FooObject._registry is BarObject._registry
    True
    >>> len(FooObject._registry)
    2

    '...' below should be 'jaraco.classes' but for pytest-dev/pytest#3396
    >>> FooObject._registry['bar']
    <class '....meta.Barobject'>
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