### Python program to find an element into binary tree

Description:
Since we have to write code for inserting an element into binary tree then we must know what is Binary tree.
Def of Binary tree: A tree is called binary tree, if each node has zero child, one child or two child.Empty tree is also a valid binary tree.So the idea is , if we  find a node whose left child is empty , we make new key as left child of the node, else if we
find a node whose right side is empty, we make new key as right child of the node.We keep traversing the
tree until we find a node whose either left or right child is empty.

Program:

import queue
class BinaryTreeNode:
def __init__(self, data):
self.data = data
self.left = None
self.right = None
def getData(self):
return self.data
def getLeft(self):
return self.left
def getRight(self):
return self.right
def insertLeft(self, newnode):
if self.left == None: self.left = newnode
self.left = newnode
else: newnode.left = self.left self.left = newnode
newnode.left = self.left
self.left = newnode
def insertRight(self, newnode):
if self.right == None: self.right = newnode
self.right = newnode
else: newnode.right = self.right self.right = newnode
newnode.right = self.right
self.right = newnode
def preorderR(self, a=None):
if not a: a = self print(a.data)
a = self
print(a.data)
if a.left: self.preorderR(a.left)
self.preorderR(a.left)
if a.right: self.preorderR(a.right)
self.preorderR(a.right)
def levelOrder(self):
print("Level Order Traversing:") q = queue.Queue() result = [] q.put(self)
q = queue.Queue()
result = []
q.put(self)
while not q.empty(): node = q.get() result.append(node.getData())
node = q.get()
result.append(node.getData())
if node.getLeft(): q.put(node.getLeft())
q.put(node.getLeft())
if node.getRight(): q.put(node.getRight()) print(result) A = BinaryTreeNode(
q.put(node.getRight())
print(result)
A = BinaryTreeNode("A") B = BinaryTreeNode(
B = BinaryTreeNode("B") C = BinaryTreeNode(
C = BinaryTreeNode("C") D = BinaryTreeNode(
D = BinaryTreeNode("D") E= BinaryTreeNode(
E= BinaryTreeNode("E") F = BinaryTreeNode(
F = BinaryTreeNode("F") G = BinaryTreeNode(
G = BinaryTreeNode("G") A.insertLeft(B) A.insertRight(C) B.insertLeft(D) B.insertRight(E) C.insertLeft(F) C.insertRight(G) print(
A.insertLeft(B)
A.insertRight(C)
B.insertLeft(D)
B.insertRight(E)
C.insertLeft(F)
C.insertRight(G)
print("Pre-Order Recursive:") A.preorderR() A.levelOrder()
A.preorderR()
A.levelOrder()

Output:
Pre-Order Recursive:
A
B
D
E
C
F
G
Level Order Traversing:
['A', 'B', 'C', 'D', 'E', 'F', 'G']

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