My code does not produce the required output, can anyone let me know what seems to be off? Input: from Node import Node from LinkedList import LinkedList def print_linkedlist(list): print(f'Linked List ------ Nodes ----------------------------------') print(f'head: {list.head.name:<6}', end=' ') node = list.head while node != None: print(f"{node.name:<12}", end=' ') node = node.next print() print(f'tail: {list.tail.name:<6}', end=' ') node = list.head while node != None: print(f"data:{node.data:<7}", end=' ') node = node.next print() print(f' ', end=' ') node = list.head while node != None: if node.next != None: print(f"next:{node.next.name:<7}", end=' ') else: print("next:None") node = node.next print() print(f' ', end=' ') node = list.tail while node != None: if node.prev != None: print(f"prev:{node.prev.name:<7}", end=' ') else: print("prev:None") node = node.prev print() num_list = LinkedList() node_a = Node(14, "node_a") node_b = Node(99, "node_b") node_c = Node(44, "node_c") node_d = Node(95, "node_d") node_e = Node(42, "node_e") node_f = Node(55, "node_f") num_list.append(node_a) print_linkedlist(num_list) num_list.append(node_f) num_list.append(node_e) num_list.prepend(node_b) num_list.insert_after(node_b, node_c) num_list.insert_after(node_c, node_d) num_list.remove(node_f) num_list.remove(node_a) print('List after adding nodes:', end=' ') node = num_list.head while node != None: print(node.data, end=' ') node = node.next print() num_list.remove(node_f) num_list.remove(node_a) print_linkedlist(num_list) print('List after removing nodes:', end=' ') node = num_list.head while node != None: print(node.data, end=' ') node = node.next print() Output: Linked List ------ Nodes ----------------------------------head: node_a node_atail: node_a data:14 next:None prev:None List after adding nodes: 99 44 95 42Linked List ------ Nodes ----------------------------------head: node_b node_b node_c node_d node_etail: node_e data:42 data:95 data:44 data:99 next:node_c next:node_d next:node_e next:None prev:node_d prev:node_c prev:node_b prev:None List after removing nodes: 99 44 95 42 expected output: Linked List ------ Nodes ----------------------------------head: node_b node_b node_c node_d node_e tail: node_e data:99 data:44 data:95 data:42 next:node_c next:node_d next:node_e None prev:None prev:node_b prev:node_c prev:node_d

My code does not produce the required output, can anyone let me know what seems to be off? Input: from Node import Node from LinkedList import LinkedList def print_linkedlist(list): print(f'Linked List ------ Nodes ----------------------------------') print(f'head: {list.head.name:<6}', end=' ') node = list.head while node != None: print(f"{node.name:<12}", end=' ') node = node.next print() print(f'tail: {list.tail.name:<6}', end=' ') node = list.head while node != None: print(f"data:{node.data:<7}", end=' ') node = node.next print() print(f' ', end=' ') node = list.head while node != None: if node.next != None: print(f"next:{node.next.name:<7}", end=' ') else: print("next:None") node = node.next print() print(f' ', end=' ') node = list.tail while node != None: if node.prev != None: print(f"prev:{node.prev.name:<7}", end=' ') else: print("prev:None") node = node.prev print() num_list = LinkedList() node_a = Node(14, "node_a") node_b = Node(99, "node_b") node_c = Node(44, "node_c") node_d = Node(95, "node_d") node_e = Node(42, "node_e") node_f = Node(55, "node_f") num_list.append(node_a) print_linkedlist(num_list) num_list.append(node_f) num_list.append(node_e) num_list.prepend(node_b) num_list.insert_after(node_b, node_c) num_list.insert_after(node_c, node_d) num_list.remove(node_f) num_list.remove(node_a) print('List after adding nodes:', end=' ') node = num_list.head while node != None: print(node.data, end=' ') node = node.next print() num_list.remove(node_f) num_list.remove(node_a) print_linkedlist(num_list) print('List after removing nodes:', end=' ') node = num_list.head while node != None: print(node.data, end=' ') node = node.next print() Output: Linked List ------ Nodes ----------------------------------head: node_a node_atail: node_a data:14 next:None prev:None List after adding nodes: 99 44 95 42Linked List ------ Nodes ----------------------------------head: node_b node_b node_c node_d node_etail: node_e data:42 data:95 data:44 data:99 next:node_c next:node_d next:node_e next:None prev:node_d prev:node_c prev:node_b prev:None List after removing nodes: 99 44 95 42 expected output: Linked List ------ Nodes ----------------------------------head: node_b node_b node_c node_d node_e tail: node_e data:99 data:44 data:95 data:42 next:node_c next:node_d next:node_e None prev:None prev:node_b prev:node_c prev:node_d

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

My code does not produce the required output, can anyone let me know what seems to be off?

Input:

from Node import Node

from LinkedList import LinkedList

def print_linkedlist(list):

print(f'Linked List ------ Nodes ----------------------------------')

print(f'head: {list.head.name:<6}', end=' ')

node = list.head

while node != None:

print(f"{node.name:<12}", end=' ')

node = node.next

print()

print(f'tail: {list.tail.name:<6}', end=' ')

node = list.head

while node != None:

print(f"data:{node.data:<7}", end=' ')

node = node.next

print()

print(f' ', end=' ')

node = list.head

while node != None:

if node.next != None:

print(f"next:{node.next.name:<7}", end=' ')

else:

print("next:None")

node = node.next

print()

print(f' ', end=' ')

node = list.tail

while node != None:

if node.prev != None:

print(f"prev:{node.prev.name:<7}", end=' ')

else:

print("prev:None")

node = node.prev

print()

num_list = LinkedList()

node_a = Node(14, "node_a")

node_b = Node(99, "node_b")

node_c = Node(44, "node_c")

node_d = Node(95, "node_d")

node_e = Node(42, "node_e")

node_f = Node(55, "node_f")

num_list.append(node_a)

print_linkedlist(num_list)

num_list.append(node_f)

num_list.append(node_e)

num_list.prepend(node_b)

num_list.insert_after(node_b, node_c)

num_list.insert_after(node_c, node_d)

num_list.remove(node_f)

num_list.remove(node_a)

print('List after adding nodes:', end=' ')

node = num_list.head

while node != None:

print(node.data, end=' ')

node = node.next

print()

num_list.remove(node_f)

num_list.remove(node_a)

print_linkedlist(num_list)

print('List after removing nodes:', end=' ')

node = num_list.head

while node != None:

print(node.data, end=' ')

node = node.next

print()

Output:

Linked List ------ Nodes ----------------------------------
head: node_a node_a
tail: node_a data:14
next:None

prev:None

List after adding nodes: 99 44 95 42
Linked List ------ Nodes ----------------------------------
head: node_b node_b node_c node_d node_e
tail: node_e data:42 data:95 data:44 data:99
next:node_c next:node_d next:node_e next:None

prev:node_d prev:node_c prev:node_b prev:None

List after removing nodes: 99 44 95 42

expected output:

Linked List ------ Nodes ----------------------------------

head: node_b node_b       node_c       node_d       node_e

tail: node_e data:99      data:44      data:95      data:42

             next:node_c next:node_d next:node_e None

             prev:None    prev:node_b prev:node_c prev:node_d

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