Single LinkedList

.py

class Node:
  def __init__(self, data=None, next=None):
    self.data = data
    self.next = next
    
class LinkedList:
  def __init__(self):
    self.head = None

  def get_length(self):
      counter = 0
      head = self.head
      while head:
          counter += 1
          head = head.next
      return counter
    
  def insert_at_start(self, data):
    node = Node(data, self.head)
    self.head = node
    
  def insert_at_end(self, data):
    
    itr = self.head
    if self.head is None:
      self.head = Node(data, none)
      return
    
    while itr.next:
      itr = itr.next
    itr.next = Node(data)

  def insert_at(self, index, data):
    if index < 0:
      print("Cannot have negative index")
      return
    elif index > self.get_length():
      print("Length exceeded")
      return
    elif index == 0:
      self.insert_at_start(data)
    else:
      itr = self.head
      count = 0
      while itr:
        if count == index-1:
          node = Node(data, itr.next)
          itr.next = node
          break
        itr = itr.next
        count = count + 1

  def delete_at(self, index):
    if index < 0:
      print("Cannot have negative index")
      return
    elif index > self.get_length():
      print("Length exceeded")
      return
    elif index == 0:
      self.head = self.head.next
    else:
      itr = self.head
      count = 0
      while itr:
        if count == index-1:
          itr.next = itr.next.next
          break
        itr = itr.next
        count = count + 1
        
  def insert_values(self, data_list):
    self.head = none
    for data in data_list:
      self.insert_at_end(data)
    
      
  
  def print(self):
    head = self.head
    while head:
      print("Value: ", head.data)
      head = head.next
    return


  
  
ll = LinkedList()
ll.insert_at_start(2)
ll.insert_at_start(18)
ll.insert_at_end(11)
ll.insert_at_start(221)
ll.print()
print(ll.get_length())
ll.insert_at(2,65)
ll.insert_at(3,8787)
ll.print()
ll.delete_at(1)

print("Removing values")
ll.print()