Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN: 9780133594140
Author: James Kurose, Keith Ross
Publisher: PEARSON
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using Python Programming.

### DoublyLinkedList Class Implementation Guide

#### Instructions:

1. **Implement and Test the DoublyLinkedList Class:**
   - Implement the class in `lab7_doublyLinkedList.py`.
   - Include both `Node` and `DoublyLinkedList` class implementations.
   - Print the output to the screen and save it in the file `lab7_output.txt` for testing purposes.

2. **Complexity Analysis:**
   - Output one line for each method, indicating its complexity: O(1), O(n), or O(n*n).

#### Class Overview:

##### DoublyLinkedList

- **Attributes:**
  - `+ head: Node`
  - `+ tail: Node`
  - `- _len: int`

- **Methods:**
  - `+ DoublyLinkedList()`
  - `insertAtHead(object item) : void`
  - `insertAtTail(object item) : void`
  - `insertAtAfter(object item, Node refNode) : void`
  - `insertBefore(object item, Node refNode) : void`
  - `deleteFromHead() : object`
  - `deleteFromTail() : object`
  - `deleteAt(Node node2Remove) : object`
  - `delete(item: object) : void`
  - `deleteAll(item: object) : void`
  - `+isEmpty() : boolean`
  - `+ clear() : void`
  - `+ __str__() : string`
  - `+ __len__() : int`
  - `+ __iter__()`
  - `+ __getitem__(int index) : object`
  - `+ __setitem__(int index, object item) : object`

##### Node

- **Attributes:**
  - `+ data : object`
  - `+ prev : Node`
  - `+ next : Node`

- **Methods:**
  - `+ Node(data, prev, nxt)`
  - `+ __str__() : string`

### Diagram Explanation:

The diagram represents the structure of a doubly linked list item and its basic operations. It shows how nodes are connected forward and backward, allowing traversal in both directions. The class includes methods for insertion, deletion, iteration, and checking emptiness, along with complexity notes for each operation.
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Transcribed Image Text:### DoublyLinkedList Class Implementation Guide #### Instructions: 1. **Implement and Test the DoublyLinkedList Class:** - Implement the class in `lab7_doublyLinkedList.py`. - Include both `Node` and `DoublyLinkedList` class implementations. - Print the output to the screen and save it in the file `lab7_output.txt` for testing purposes. 2. **Complexity Analysis:** - Output one line for each method, indicating its complexity: O(1), O(n), or O(n*n). #### Class Overview: ##### DoublyLinkedList - **Attributes:** - `+ head: Node` - `+ tail: Node` - `- _len: int` - **Methods:** - `+ DoublyLinkedList()` - `insertAtHead(object item) : void` - `insertAtTail(object item) : void` - `insertAtAfter(object item, Node refNode) : void` - `insertBefore(object item, Node refNode) : void` - `deleteFromHead() : object` - `deleteFromTail() : object` - `deleteAt(Node node2Remove) : object` - `delete(item: object) : void` - `deleteAll(item: object) : void` - `+isEmpty() : boolean` - `+ clear() : void` - `+ __str__() : string` - `+ __len__() : int` - `+ __iter__()` - `+ __getitem__(int index) : object` - `+ __setitem__(int index, object item) : object` ##### Node - **Attributes:** - `+ data : object` - `+ prev : Node` - `+ next : Node` - **Methods:** - `+ Node(data, prev, nxt)` - `+ __str__() : string` ### Diagram Explanation: The diagram represents the structure of a doubly linked list item and its basic operations. It shows how nodes are connected forward and backward, allowing traversal in both directions. The class includes methods for insertion, deletion, iteration, and checking emptiness, along with complexity notes for each operation.
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