関連ワード:  how to define a linked list python    how to create a linked list python    how to declare a linked list in python    how to create a new linked list python    how to create a node in linked list python    how to create a linked list class 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 set up a linked list in python