関連ワード:  how to write a linked list in python    how to create a linked list in python    how to implement a linked list in python    how to create a new linked list in python    how to create a singly linked list in python    how to create a doubly linked list in python    how to create a circular linked list in python    how to implement a doubly linked list in python    how to implement a singly linked list in python    how to create a node in linked list in python