78 lines
1.9 KiB
Python
78 lines
1.9 KiB
Python
# Author: github.com/Mo-Shakib
|
|
|
|
class Node:
|
|
def __init__(self, data = None):
|
|
self.left = None
|
|
self.right = None
|
|
self.data = data
|
|
|
|
# for setting left node
|
|
def setLeft(self, node):
|
|
self.left = node
|
|
|
|
# for setting right node
|
|
def setRight(self, node):
|
|
self.right = node
|
|
|
|
# for getting the left node
|
|
def getLeft(self):
|
|
return self.left
|
|
|
|
# for getting right node
|
|
def getRight(self):
|
|
return self.right
|
|
|
|
# for setting data of a node
|
|
def setData(self, data):
|
|
self.data = data
|
|
|
|
# for getting data of a node
|
|
def getData(self):
|
|
return self.data
|
|
|
|
|
|
# in this we traverse first to the leftmost node, then print its data and then traverse for rightmost node
|
|
def inorder(Tree):
|
|
if Tree:
|
|
inorder(Tree.getLeft())
|
|
print(Tree.getData(), end = ' ')
|
|
inorder(Tree.getRight())
|
|
return
|
|
|
|
# in this we first print the root node and then traverse towards leftmost node and then to the rightmost node
|
|
def preorder(Tree):
|
|
if Tree:
|
|
print(Tree.getData(), end = ' ')
|
|
preorder(Tree.getLeft())
|
|
preorder(Tree.getRight())
|
|
return
|
|
|
|
# in this we first traverse to the leftmost node and then to the rightmost node and then print the data
|
|
def postorder(Tree):
|
|
if Tree:
|
|
postorder(Tree.getLeft())
|
|
postorder(Tree.getRight())
|
|
print(Tree.getData(), end = ' ')
|
|
return
|
|
|
|
if __name__ == '__main__':
|
|
root = Node(1)
|
|
root.setLeft(Node(2))
|
|
root.setRight(Node(3))
|
|
root.left.setLeft(Node(4))
|
|
|
|
print('Inorder Traversal:')
|
|
inorder(root)
|
|
print('\nPreorder Traversal:')
|
|
preorder(root)
|
|
print('\nPostorder Traversal:')
|
|
postorder(root)
|
|
|
|
# OUTPUT:
|
|
# Inorder Traversal:
|
|
# 4 2 1 3
|
|
# Preorder Traversal:
|
|
# 1 2 4 3
|
|
# Postorder Traversal:
|
|
# 4 2 3 1
|