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Shu13ham-krShu13ham-kr
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Use of classes and objects to show OOPs
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‎Python/Book.ipynb‎

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{
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"cells": [
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{
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"cell_type": "code",
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"execution_count": 19,
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"metadata": {},
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"outputs": [],
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"source": [
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"class Book:\n",
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" \n",
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" BOOK_TYPES = (\"HARDCOVER\", \"PAPERBACK\", \"EBOOK\")\n",
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" __booklist = None\n",
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" \n",
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" @classmethod\n",
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" def getbooktypes(cls):\n",
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" return cls.BOOK_TYPES\n",
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" \n",
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" \n",
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" def __init__(self, title, author, pages, price, booktype):\n",
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" self.title = title\n",
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" self.author = author\n",
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" self.pages = pages\n",
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" self.price = price\n",
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" if (not booktype in Book.BOOK_TYPES):\n",
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" raise ValueError(f\"{booktype} is not a valid booktype.\")\n",
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" self.booktype = booktype\n",
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" \n",
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" @staticmethod\n",
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" def getbooklist():\n",
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" if Book.__booklist == None:\n",
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" Book.__booklist = []\n",
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" return Book.__booklist\n",
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" \n",
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" def getprice(self):\n",
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" if hasattr(self, \"_discount\"):\n",
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" return self.price - (self.price*self._discount)\n",
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" else:\n",
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" return self.price\n",
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" \n",
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" def setdiscount(self,amount):\n",
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" self._discount = amount\n",
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" \n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 9,
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"metadata": {},
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"outputs": [],
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"source": [
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"b1 = Book(\"War and Peace\", \"Leo Tolstoy\", 1225, 39.95)\n",
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"b2 = Book(\"The catcher in the Rye\", \"JD Salinger\", 234, 29.95)\n",
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"\n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 10,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"39.95\n"
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]
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}
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],
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"source": [
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"print(b1.getprice())"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 11,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"29.95\n",
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"22.4625\n"
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]
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}
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],
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"source": [
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"print(b2.getprice())\n",
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"b2.setdiscount(0.25)\n",
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"print(b2.getprice())"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 20,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"Book types: ('HARDCOVER', 'PAPERBACK', 'EBOOK')\n"
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]
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}
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],
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"source": [
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"\n",
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"print(\"Book types:\", Book.getbooktypes())\n",
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"b1 = Book(\"War and Peace\", \"Leo Tolstoy\", 1225, 39.95, \"HARDCOVER\")\n",
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"b2 = Book(\"War and Peace\", \"Leo Tolstoy\", 1225, 39.95, \"PAPERBACK\")\n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 22,
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"metadata": {},
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"outputs": [],
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"source": [
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"booklist = Book.getbooklist()\n",
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"booklist.append(b1)\n",
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"booklist.append(b2)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 23,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"[<__main__.Book at 0x1d32693c6a0>, <__main__.Book at 0x1d32693c970>]"
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]
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},
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"execution_count": 23,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"booklist"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 24,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"'War and Peace'"
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]
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},
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"execution_count": 24,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"booklist[0].title"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": []
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "Python 3",
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"language": "python",
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"name": "python3"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 3
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython3",
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"version": "3.8.5"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 4
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}

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