pll_1.py

from typing import Any, Union


class Node:
    """A linked list node implementation"""

    def __init__(self, node_data: Any) -> None:
        """Initialize the node with the given data and pointing to None"""
        self._data = node_data
        self._next_node = None

    def __str__(self) -> str:
        """Return a string representation of the node"""
        return str(self.data)

    @property
    def data(self) -> Any:
        """Returns the node's data"""
        return self._data

    @data.setter
    def data(self, node_data: Any) -> None:
        """Replaces the node's data with the given data"""
        self._data = node_data

    @property
    def next_node(self) -> Union["Node", None]:
        """Returns the node's next"""
        return self._next_node

    @next_node.setter
    def next_node(self, next_node: Union["Node", None]) -> None:
        """Replaces the node's data with the given data"""
        self._next_node = next_node