A linked list is composed of a chain of objects known as nodes. Each node contains a value and a pointer to the next node in the chain. The first node in a list is known as the head. The last element in the list points to null (indicating the end of the list).

Example implementation of a Node class:

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

The following example is a Linked List class that creates a single head node:

class LinkedList:
    def __init__(self):
        self.head = None

The following snippet creates a linked list with 3 elements:

my_linked_list = LinkedList()                   # create a LinkedList object
my_linked_list.head = Node("Jon")         # sets the head's value to "Jon"
element2 = Node("Sarah")                    # create a Node with value "Sarah"
element3 = Node("Matt")                     # create a Node with value "Matt"
my_linked_list.head.next = element2     # sets the head's next element to element2
element2.next = element3                    # sets element2's next element to element3