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class ApiAttribute(object):
    """A data descriptor that sets and returns values."""
    def __init__(self, name):
        """Create an instance of ApiAttribute.

    :param name: name of this attribute.
    :type name: str.
    """
        self.name = name
    
    def __get__(self, obj, type=None):
        """Accesses value of this attribute."""
        return obj.attr.get(self.name)
    
    def __set__(self, obj, value):
        """Write value of this attribute."""
        obj.attr[self.name] = value
        if obj.dirty.get(self.name) is not None:
            obj.dirty[self.name] = True
    
    def __del__(self, obj):
        """Delete value of this attribute."""
        del obj.attr[self.name]
        if obj.dirty.get(self.name) is not None:
            del obj.dirty[self.name]