A very simple linked list in Python.

linked_list.py

import random


class Item:
    next = None
    data = 0

    def __init__(self):
        self.data = random.random()


class LinkedList:
    head = None
    length = 0

    def add(self, item):
        item.next = self.head
        self.head = item
        self.length += 1

    def iterate(self):
        head = self.head
        while head is not None:
            yield head
            head = head.next


ll = LinkedList()

for i in range(0,100):
    item = Item()
    ll.add(item)

for i in ll.iterate():
    print(i.data)