Python namedtuple, but a base class.

namedtuple_cls.py

# https://gist.github.com/TheArcherST/fd9d924323de6e50cc7794d4a67fffd7


from typing import ClassVar, Type

from collections import namedtuple
from itertools import chain


class Namedtuple(
    tuple  # for IDE typechecker
):
    """Namedtuple base class

    Allows to create namedtuple with explicitly defined fields,
    to allow IDE like PuCharm infer field names and their types.

    Example
    -------

    >>> from typing import Generic, TypeVar
    >>> from numbers import Number
    ...
    >>> _T = TypeVar("_T", bound=Number)
    ...
    >>> class Coordinates2D(Namedtuple, Generic[_T]):
    ...    x: _T
    ...    y: _T
    ...
    >>> class Coordinates3D(Coordinates2D[_T]):
    ...     z: _T
    ...
    >>> coord = Coordinates3D(1, 2, 3)
    >>> print(coord)
    Coordinates3D(x=1, y=2, z=3)
    >>> print(coord.x)
    1

    """

    __tp: ClassVar[Type[tuple]]

    def __init_subclass__(cls, **kwargs):
        cls.__tp = namedtuple(
            cls.__name__,
            chain.from_iterable(
                filter(lambda x: not x.startswith("_" + i.__name__),
                       getattr(i, "__annotations__", {}))
                for i in reversed(cls.__mro__)
            ),
        )

    def __new__(cls, *args, **kwargs):
        return cls.__tp(*args, **kwargs)