def get_origin(tp):
    """Get the unsubscripted version of a type. Supports generic types, Union,
    Callable, and Tuple. Returns None for unsupported types. Examples::

        get_origin(int) == None
        get_origin(ClassVar[int]) == None
        get_origin(Generic) == Generic
        get_origin(Generic[T]) == Generic
        get_origin(Union[T, int]) == Union
        get_origin(List[Tuple[T, T]][int]) == list  # List prior to Python 3.7
    """
    if NEW_TYPING:
        if isinstance(tp, _GenericAlias):
            return tp.__origin__ if tp.__origin__ is not ClassVar else None
        if tp is Generic:
            return Generic
        return None
    if isinstance(tp, GenericMeta):
        return _gorg(tp)
    if is_union_type(tp):
        return Union

    return None
Get the unsubscripted version of a type. Supports generic types, Union,
    Callable, and Tuple. Returns None for unsupported types. Examples::

        get_origin(int) == None
        get_origin(ClassVar[int]) == None
        get_origin(Generic) == Generic
        get_origin(Generic[T]) == Generic
        get_origin(Union[T, int]) == Union
        get_origin(List[Tuple[T, T]][int]) == list  # List prior to Python 3.7