import collections

ModifiableProperty = collections.namedtuple('ModifiableProperty',
                                            ['getter', 'setter'])

ModifiablePropertyWithAst = collections.namedtuple('ModifiablePropertyWithAst',
                                                   [
                                                       'getter',
                                                       'setter',
                                                       'ast',
                                                       'elements',
                                                   ])

def is_modifiable_property(element):
    return (isinstance(element, ModifiableProperty) or
            isinstance(element, ModifiablePropertyWithAst))