# Python Programming Examples on Trees

Here is the listing of Python programming examples on Trees.

## 1. Python Examples on Tree Traversals

Tree traversals are most naturally expressed in recursion. Inorder Traversal method, the left subtree is visited first, then the root and later the right sub-tree. Depth-first search is an algorithm for traversing or searching tree or graph data structures. One starts at the root and explores as far as possible along each branch before backtracking. Breadth-first search is an algorithm for traversing or searching tree or graph data structures. It starts at the tree root and explores the neighbor nodes first, before moving to the next level neighbors. This section contains Python programs on dfs, bfs, finding largest value in a tree using inorder traversal, implementing dfs using post order, program on creating a mirror copy of tree using bfs, program to build binary tree, programs on depth first binary tree search with and without using recursion.

Python Program for Depth First Binary Tree Search using Recursion Python Program for Depth First Binary Tree Search without using Recursion Python Program to Find Nth Node in the Inorder Traversal of a Tree Python Program to Find the Largest value in a Tree using Inorder Traversal Python Program to Implement Depth First Search Traversal using Post Order Python Program to Create a Mirror Copy of a Tree and Display using BFS Traversal Python Program to Build Binary Tree if Inorder or Postorder Traversal as Input Python Program to Traverse the Tree Recursively Python Program to Search an Element in a Tree Recursively Python Program to Search an Element in a Tree Non-Recursively Python Program to Traverse the Tree Non-Recursively |

## 2. Python Examples on Heap and Binary Tree Implementation

Binary heap is a complete binary tree which satisfies the heap ordering property. Heap is a special tree structure in which each parent node is less than or equal to its child node. Heap is created by using python’s inbuilt library named heapq. This section contains Python programs on constructing binary search tree and performing delete operation and inorder traversal, finding the largest and smallest elements in the binary search tree, programs on heap, finding the common ancestor and prints the path, constructing a b tree and balanced binary tree using sorted array.

Python Program to Construct a Binary Search Tree and perform deletion and inorder traversal Python Program To Find the Smallest and Largest Elements in the Binary Search Tree Python Program to Implement a Heap & provide Insertion & Deletion Operation Python Program to Construct a B Tree Python Program to Construct a Balanced Binary Tree using Sorted Array Python Program to Find the Common Ancestor and Print the Path |

## 3. Python Examples dealing with the Nodes of a Tree

In a tree each node may have two or more links to other nodes. A tree is not a sequential data structure. A node is a leaf node if both left and right child nodes of it are null. This section contains Python programs on counting leaf nodes in a tree, finding binary nodes in a tree, printing the border of given tree in anticlockwise direction, finding the maximum distance nodes in a binary tree, program to print height and depth of a given binary tree.

Python Program to Count Number of Leaf Node in a Tree Python Program to Find the Number of Nodes in a Binary Tree Python Program to Print Border of given Tree in Anticlockwise Direction Python Program to Count Number of Non Leaf Nodes of a given Tree Python Program to Print Height and Depth of given Binary Tree Python Program to Find Nodes which are at Maximum Distance in Binary Tree |

## 4. Python Examples on Special Properties of Binary Trees

A binary search tree relies on the property that keys that are less than the parent are found in the left subtree, and keys that are greater than the parent are found in the right subtree. Common ancestor traverses the tree in depth-first order, keeping track of which of N1 and N2 have been visited so far. The Python programs in this section checks whether a given tree and its mirror image are same, program on creating mirror copy of tree and displaying using bfs, finding the nearest common ancestor in a given nodes, converting binary tree to binary search tree, finding the total vertical lines in a given binary search tree.

Python Program to Find the Sum of all Nodes in a Tree Python Program to Check whether a Tree and its Mirror Image are same Python Program to Create a Mirror Copy of a Tree and Display using BFS Traversal Python Program to Find the Nearest Common Ancestor in the Given set of Nodes Python Program to Find the Common Ancestor and Print the Path Python Program to Print all the Elements of Nth Level in Single Line Python Program to Convert Binary Tree to Binary Search Tree Python Program to find the Total Columns/Vertical Lines of a given Binary Search Tree |

## 5. Python Examples on BFS and DFS Traversals

The left subtree of a node contains only nodes with keys less than the node’s key. In Inorder Traversal, left subtree is visited first, then the root and later the right sub-tree. Dfs and bfs is an algorithms for traversing or searching tree or graph data structures. This section contains Python programs on constructing a tree and performing operations like insertion, deletion and display, program to check whether given tree is a binary search tree or not, program to print all the paths from leaf root in a tree, displaying nodes in a tree using bfs traversal, finding the nearest sibling node in a given tree, finding the 2 longest nodes in a tree and displaying using inorder traversal.

Python Program to Construct a Tree & Perform Insertion, Deletion, Display Python Program to Check whether a Tree is a Binary Search Tree Python Program to Print all the Paths from the Root to the Leaf in a Tree Python Program to Print only Nodes in Left SubTree Python Program to Display the Nodes of a Tree using BFS Traversal Python Program to Find the Nearest Sibling of a Node in a Tree Python Program to Find 2 Nodes with Longest Distance and Display using Inorder Traversal |

## 6. Python Examples on Inorder Traversal of a Binary Tree

A binary tree is a tree like structure that has a root and in which each vertex has no more than two children. Each child of a vertex is called a left or right child. This section contains Python programs on constructing binary search tree and performing deletion operation and inorder traversal, searching for a particular value in a given binary tree, finding the sum of all nodes and maximum distance nodes in a given binary tree.

Python Program to Find the Sum of All Nodes in a Binary Tree Python Program to Search for a Particular Value in a Binary Tree Python Program to Find Nodes which are at Maximum Distance in Binary Tree Python Program to Construct a Binary Search Tree and perform deletion and inorder traversal |