An empty node object for a linked list with full test coverage.

node.py

class Node(object):
    """A node to be used for a linked list"""
    def __init__(self, data):
        """Create a new Node instance

        >>> head = Node(4)
        >>> print(head.next)
        None
        >>> head.data
        4
        """
        pass

    def __len__(self):
        """Get the length of the list from the current node

        >>> head = Node(4)
        >>> len(head)
        1
        >>> head.insert_after(Node(1))
        >>> len(head)
        2
        """
        pass

    def __str__(self):
        """Print the data the node contains and what it points to
        
        >>> head = Node(4)
        >>> print(head)
        4 => None
        >>> head.insert_after(Node(5))
        >>> print(head)
        4 => 5 => None
        """
        pass

    def insert_after(self, new):
        """Insert a node after the current node.

        >>> head = Node(4)
        >>> head.insert_after(Node(5))
        >>> print(head)
        4 => 5 => None
        """
        pass

    def insert_beginning(self, new):
        """Insert a node at the beginning of a list.

        >>> head = Node(5)
        >>> print(head)
        5 => None
        >>> head = head.insert_beginning(Node(2))
        >>> print(head)
        2 => 5 => None
        """
        pass

    def remove_after(self):
        """Remove the node following the current node.
        
        >>> head = Node(2)
        >>> head.insert_after(Node(3))
        >>> head.remove_after()
        >>> print(head)
        2 => None
        """
        pass

    def remove_beginning(self):
        """Remove the current head.

        >>> head = Node(1)
        >>> head.insert_after(Node(2))
        >>> head = head.remove_beginning()
        >>> print(head)
        2 => None
        """
        pass


if __name__ == "__main__":
    import doctest
    doctest.testmod()