>>> A = namedtuple('A', ['x', 'y'])
>>> A(1, 2)._asdict()
OrderedDict([('x', 1), ('y', 2)])
>>> class B(namedtuple('B', ['x', 'y'])):
...     pass
...
>>> B(1, 2)._asdict()
{}
>>> class C(namedtuple('C', ['x', 'y'])):
...     __slots__ = ()
...
>>> C(1, 2)._asdict()
OrderedDict([('x', 1), ('y', 2)])