Traceback (most recent call last):
  File "bar.py", line 10, in <module>
    pickle.loads(pickle.dumps(foo))
TypeError: __new__() takes 1 positional argument but 3 were given

from collections import namedtuple
import pickle

class Foo(namedtuple("_Foo", ["a", "b"])):
    def __new__(cls, *args, **kwargs):
        self = super().__new__(cls, *args, **kwargs)
        # some custom code
        return self

foo = Foo(a=1, b=2)
pickle.loads(pickle.dumps(foo))