What does the following Python code snippet accomplish?class LinkedList: def __init__(self): self.head = None def insert_at_beginning(self, data): new_node = Node(data) new_node.next = self.head self.head = new_node
Question
What does the following Python code snippet accomplish?class LinkedList: def init(self): self.head = None def insert_at_beginning(self, data): new_node = Node(data) new_node.next = self.head self.head = new_node
Solution
This Python code snippet defines a simple implementation of a linked list data structure. Here's a step-by-step explanation:
-
The
LinkedListclass is defined. This class will represent the linked list. -
Inside the
LinkedListclass, the__init__method is defined. This is the constructor for the class. It initializes a new instance of the class withself.headset toNone. This means that when a newLinkedListis created, it doesn't have any nodes - it's empty. -
The
insert_at_beginningmethod is defined. This method is used to add a new node at the beginning of the linked list. It takes one argument,data, which is the data to be stored in the new node. -
Inside
insert_at_beginning, a new node is created with the given data. This is done by creating a new instance of theNodeclass (which is not shown in the code snippet, but we can assume it's defined somewhere else). The new node'snextattribute is set to the current head of the list, which means the new node is now pointing to the first node of the list. -
Finally,
self.headis updated to point to the new node. This means the new node is now the first node in the list.
In summary, this code snippet defines a basic linked list data structure and provides a method to add a new node at the beginning of the list.
Similar Questions
What will be the output of the following code?class Node: def __init__(self, data=None): self.data = data self.next = Noneclass LinkedList: def __init__(self): self.head = None def print_list(self): current_node = self.head while current_node: print(current_node.data) current_node = current_node.next def insert_at_beginning(self, new_data): new_node = Node(new_data) new_node.next = self.head self.head = new_nodellist = LinkedList()llist.insert_at_beginning(3)llist.insert_at_beginning(2)llist.insert_at_beginning(1)llist.print_list()Options1 2 31 3 22 3 13 2 1
What is the output of the following Python code snippet?class LinkedList: def __init__(self): self.head = None def append(self, data): new_node = Node(data) if self.head is None: self.head = new_node else: current = self.head while current.next: current = current.next current.next = new_node def display(self): current = self.head while current: print(current.data, end=" ") current = current.nextll = LinkedList()ll.append(1)ll.append(2)ll.display()
What does the following Python code snippet accomplish?def reverse_linked_list(head): prev = None current = head while current is not None: next_node = current.next current.next = prev prev = current current = next_node head = prev return head
What does the following Python code snippet accomplish?class Node: def __init__(self, data): self.data = data self.next = Nonenode1 = Node(1)node2 = Node(2)node1.next = node2Creates two linked list nodes with data 1 and 2, respectivelyCreates a singly linked list with two nodes containing data 1 and 2, respectivelyCreates a doubly linked list with two nodes containing data 1 and 2, respectivelyRaises a syntax error
What is the purpose of the append method in a linked list?Inserts a new node at the beginning of the linked listDeletes the last node of the linked listAppends a new node to the end of the linked listReverses the linked list
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