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Ternary Search Tree Data Structure Implements using Python
{
"cells": [
{
"cell_type": "code",
"execution_count": 1,
"metadata": {},
"outputs": [],
"source": [
"class Node(object):\n",
" def __init__(self, char):\n",
" self.char = char\n",
" self.left = self.middle = self.right = None\n",
" self.value = None\n",
" \n",
"class TernarySearchTree(object):\n",
" def __init__(self):\n",
" self.root = None\n",
" \n",
" def __repr__(self):\n",
" return 'TernarySearchTree()'\n",
" \n",
" def put(self, key, value):\n",
" self.root = self.recursive(key, value)(self.root, 0)\n",
" \n",
" def get(self, key):\n",
" node = self.recursive(key)(self.root, 0)\n",
" if node:\n",
" return node.value\n",
" return -1\n",
" \n",
" def recursive(self, key, value=None):\n",
" \n",
" def putter(node, index): \n",
" char = key[index]\n",
" \n",
" if node is None:\n",
" node = Node(char) \n",
" if char < node.char:\n",
" node.left = putter(node.left, index)\n",
" elif char > node.char:\n",
" node.right = putter(node.right, index)\n",
" elif index < len(key) - 1:\n",
" node.middle = putter(node.middle, index+1)\n",
" else:\n",
" node.value = value\n",
" \n",
" return node\n",
" \n",
" def getter(node, index):\n",
" char = key[index]\n",
" \n",
" if node is None:\n",
" return None\n",
" \n",
" if char < node.char:\n",
" return getter(node.left, index)\n",
" elif char > node.char:\n",
" return getter(node.right, index)\n",
" elif index < len(key) - 1:\n",
" return getter(node.middle, index+1)\n",
" else:\n",
" return node\n",
" \n",
" if value:\n",
" return putter\n",
" else:\n",
" return getter"
]
},
{
"cell_type": "code",
"execution_count": 2,
"metadata": {},
"outputs": [],
"source": [
"tst = TernarySearchTree()"
]
},
{
"cell_type": "code",
"execution_count": 3,
"metadata": {},
"outputs": [],
"source": [
"tst.put('apple', 1)\n",
"tst.put('admin', 2)\n",
"tst.put('cute', 3)"
]
},
{
"cell_type": "code",
"execution_count": 4,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"3"
]
},
"execution_count": 4,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"tst.get('cute')"
]
},
{
"cell_type": "code",
"execution_count": 5,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"-1"
]
},
"execution_count": 5,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"tst.get('orange')"
]
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 3",
"language": "python",
"name": "python3"
},
"language_info": {
"codemirror_mode": {
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"file_extension": ".py",
"mimetype": "text/x-python",
"name": "python",
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"version": "3.5.2"
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