list.py

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

class List:

    def __init__(self):
        self.head = None

    def addInEnd(self, el):
        newNode = Node(el)
        if self.head is None:
            self.head = newNode
            return
        else:
            tmp = self.head
            while tmp.next:
                tmp = tmp.next
            tmp.next = newNode

    def display(self):
        node = self.head
        while node:
            print(node.data)
            node = node.next


l = List()

l.addInEnd(3)
l.addInEnd(5)
l.addInEnd(6)

l.display()