link_list.py

from typing import Union


class Node:
   def __init__(self, data):
      self.data = data
      self.next: Node = None # type: ignore

class LinkedList:
   def __init__(self):
      self.head: Node = None  # type: ignore

   def append(self , data):
      new_node: Node = Node(data)
      if not self.head:
         self.head = new_node
         return
      current = self.head
      while current.next:
         current = current.next
      current.next = new_node
      
   def display(self):
      current: Node = self.head
      while current:
         print(current.data, end=" -> ")   
         current = current.next

linked_list = LinkedList()
linked_list.append(3)
linked_list.append(332)
linked_list.append(930)
linked_list.display()