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Пример связанного списка дважды (сохранить как linkedlist.py):

class node:
    def __init__(self, before=None, cargo=None, next=None): 
        self._previous = before
        self._cargo = cargo 
        self._next  = next 

    def __str__(self):
        return str(self._cargo) or None 

class linkedList:
    def __init__(self): 
        self._head = None 
        self._length = 0

    def add(self, cargo):
        n = node(None, cargo, self._head)
        if self._head:
            self._head._previous = n
        self._head = n
        self._length += 1

    def search(self,cargo):
        node = self._head
        while (node and node._cargo != cargo):
            node = node._next
        return node

    def delete(self,cargo):
        node = self.search(cargo)
        if node:
            prev = node._previous
            nx = node._next
            if prev:
                prev._next = node._next
            else:
                self._head = nx
                nx._previous = None
            if nx:
                nx._previous = prev 
            else:
                prev._next = None
        self._length -= 1

    def __str__(self):
        print 'Size of linked list: ',self._length
        node = self._head
        while node:
            print node
            node = node._next

Тестирование (сохранить как test.py):

from linkedlist import node, linkedList

def test():

    print 'Testing Linked List'

    l = linkedList()

    l.add(10)
    l.add(20)
    l.add(30)
    l.add(40)
    l.add(50)
    l.add(60)

    print 'Linked List after insert nodes:'
    l.__str__()

    print 'Search some value, 30:'
    node = l.search(30)
    print node

    print 'Delete some value, 30:'
    node = l.delete(30)
    l.__str__()

    print 'Delete first element, 60:'
    node = l.delete(60)
    l.__str__()

    print 'Delete last element, 10:'
    node = l.delete(10)
    l.__str__()


if __name__ == "__main__":
    test()

Выход:

Testing Linked List
Linked List after insert nodes:
Size of linked list:  6
60
50
40
30
20
10
Search some value, 30:
30
Delete some value, 30:
Size of linked list:  5
60
50
40
20
10
Delete first element, 60:
Size of linked list:  4
50
40
20
10
Delete last element, 10:
Size of linked list:  3
50
40
20