Python Nodes In A List

1
class Node:
2
    def __init__(self,value):
3
        self.data = value
4
        self.next = 0
5

6
class List:
7
    def __init__(self):
8
        self.firstNode = Node(0)
9
    def __ShowNodeData(self,aNode):
10
        if aNode.next != 0:
11
           print aNode.data
12
           self.__ShowNodeData(aNode.next)
13
    def Dump(self):
14
        self.__ShowNodeData(self.firstNode)
15
    def InsertAfter(self,aNode,aNewNode):
16
        aNewNode.next = aNode.next
17
        aNode.next = aNewNode
18
    def InsertBeginning(self,aNewNode):
19
        aNewNode.next = self.firstNode
20
        self.firstNode = aNewNode
21

22
nodeA = Node("A")
23
nodeB = Node("B")
24
nodeC = Node("C")
25
nodeD = Node("D")
26

27
aList = List()
28

29
aList.InsertBeginning(nodeB)
30
aList.InsertAfter(nodeB,nodeD)
31
aList.InsertAfter(nodeD,nodeC)
32
aList.InsertAfter(nodeC,nodeA)
33

34
aList.Dump()