Dinakaranevil/python-sample-code

A Python sample code used by Shun's Vineyard (shunsvineyard.info).

Sample Binary Tree Library

The Binary Tree Library is a Python sample project used by shunsvineyard.info. It is an example for Sphinx and My Python Coding Style.

Although it is a sample project, the Binary Tree Library is a usable tree data structure library, and has the following tree data structures:

• AVL Tree
• Binary Search Tree
• Red Black Tree
• Threaded Binary Trees

The library also provides the tree traversal feature to traverse binary trees.

• Binary Tree Traversal

  • In-order
  • Reversed In-order
  • Pre-order
  • Post-order
  • Level-order

Requirements

The Binary Tree Library requires Python 3.7 or newer. The key Python 3.7 feature used in the project is dataclass.

Installation

Install from Github

git clone https://github.com/shunsvineyard/python-sample-code.git
cd python-sample-code
pip install .

Examples

from trees import tree_exceptions
from trees.binary_trees import red_black_tree
from trees.binary_trees import traversal


class Map:
    def __init__(self):
        self._rbt = red_black_tree.RBTree()

    def __setitem__(self, key, value):
        self._rbt.insert(key=key, data=value)

    def __getitem__(self, key):
        return self._rbt.search(key=key).data

    def __delitem__(self, key):
        self._rbt.delete(key=key)

    def __iter__(self):
        return traversal.inorder_traverse(tree=self._rbt)


if __name__ == "__main__":

    # Initialize the Map instance.
    contacts = Map()

    # Add some items.
    contacts["Mark"] = "mark@email.com"
    contacts["John"] = "john@email.com"
    contacts["Luke"] = "luke@email.com"
    contacts["john"] = "john@email.com"

    # Iterate the items.
    for contact in contacts:
        print(contact)

    # Delete one item.
    del contacts["john"]

    # Check the deleted item.
    try:
        print(contacts["john"])
    except tree_exceptions.KeyNotFoundError:
        print("john does not exist")

Tree CLI

The Binary Tree Library provides a command line tool to simulate tree data structures.

tree-cli

It will show the interactive prompt. Use help to list all the available commands

Welcome to the Tree CLI. Type help or ? to list commands.

tree> help

Documented commands (type help <topic>):
========================================
build  delete  destroy  detail  exit  help  insert  search  traverse