from typing import NamedTuple
from msgpack import Ext, packb, unpackb
# Note that Ext is now an alias for ExtType, allowing 1 char
# change between libraries


class _Serializable3(NamedTuple):
    foo: str
    bar: int


class Serializable3(Ext, _Serializable3):
    type = 1

    def __init__(self, *args, **kwargs):
        super().__init__(Serializable3.type, packb(self[:]))

    @classmethod
    def _unpackb(cls, ext: Ext) -> 'Serializable3':
        return cls(*unpackb(ext.data))


class Serializable3Alt(Ext, NamedTuple('_Serializable3Alt', [('foo', str), ('bar', int)])):
    code = 2  # code works as well, if you'd like

    def __init__(self, *args, **kwargs):
        super().__init__(Serializable3Alt.type, packb(self[:]))

    @classmethod
    def _unpackb(cls, ext: Ext) -> 'Serializable3Alt':
        return cls(*unpackb(ext.data))

from collections import namedtuple
from msgpack import Ext, packb, unpackb


class Serializable2(Ext, namedtuple('_Serializable2', ['foo', 'bar'])):
    type = 3

    def __init__(self, *args, **kwargs):
        super(Serializable2, self).__init__(Serializable2.type, packb(self[:]))

    @classmethod
    def _unpackb(cls, ext):
        return cls(*unpackb(ext.data))

from msgpack import Ext, packb, unpackb


class SerializableStub(Ext):
    type = 4

    def __init__(self, foo):
        self.foo = foo
        # note that Ext is not initialized for this style

    @property
    def data(self):
        return packb((self.foo, ))

    @classmethod
    def _unpackb(cls, ext):
        return cls(*unpackb(ext.data))