OOPS

.ipynb_checkpoints/OOPS-checkpoint.ipynb

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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# OOPS:\n",
+    "\n",
+    "Object Oriented Programming or OOP is working with classes and objects. It involves interaction between objects having various attributes.\n",
+    "\n",
+    "Python is a object oriented programming language. This meand that all the types are representation or instance of a type class."
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Components:\n",
+    "1. Class\n",
+    "2. Object\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Class:\n",
+    "\n",
+    "It is a structure or a building block (a code block) representing or defining the attributes (features and behaviour) of similar parameters.\n",
+    "\n",
+    "### Definition:\n",
+    "Using `class` keyword.\n",
+    "Name of a class should start with an uppercase letter.\n",
+    "\n",
+    "Syntax: `class Class_name`"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "class Student:\n",
+    "    roll_no = int()\n",
+    "    name = str()"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Object:\n",
+    "\n",
+    "It is an instance of a class.\n",
+    "\n",
+    "Syntax: `obj_name = Class_name()`"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "student1 = Student() # creating a new object\n",
+    "\n",
+    "student1.roll_no = 1\n",
+    "student1.name = 'Prabhu'"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Prabhu\n",
+      "1\n"
+     ]
+    }
+   ],
+   "source": [
+    "print(student1.name)\n",
+    "print(student1.roll_no)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## *self* Keyword:\n",
+    "\n",
+    "Calls the attributes for current instance or object.\n",
+    "\n",
+    "Syntax: `self.attribute_name`"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Defining attributes in a class:\n",
+    "\n",
+    "Attributes or Properties are  defined using a constructor.\n",
+    "\n",
+    "### Constructor:\n",
+    "Executes a set of code whenever a new object/instance is created.\n",
+    "\n",
+    "Defined by \\_\\_init\\_\\_ method."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "class Student:\n",
+    "    def __init__(self): # default constructor\n",
+    "        self.roll_no = 0\n",
+    "        self.name = 'Name'\n",
+    "#         print('__init__ file')\n",
+    "    \n",
+    "    def study():\n",
+    "        print('Studying....')"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 8,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "__init__ file\n",
+      "Roll No: 1, Name: Ravi\n"
+     ]
+    }
+   ],
+   "source": [
+    "st1 = Student()\n",
+    "st1.roll_no = 1\n",
+    "st1.name = 'Ravi'\n",
+    "print(f'Roll No: {st1.roll_no}, Name: {st1.name}')"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 9,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "class Student:\n",
+    "    def __init__(self, rn = 0, st_name = 'Name'): # Parametric Constructor\n",
+    "        self.roll_no = rn\n",
+    "        self.name = st_name\n",
+    "#         print('__init__ file')\n",
+    "    \n",
+    "    def study():\n",
+    "        print('Studying....')"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 10,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Roll No: 2, Name: Rahul\n"
+     ]
+    }
+   ],
+   "source": [
+    "st2 = Student(2, 'Rahul')\n",
+    "print(f'Roll No: {st2.roll_no}, Name: {st2.name}')"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## destructor:\n",
+    "Delete the current instance of class or object.\n",
+    "\n",
+    "Use \\_\\_del\\_\\_ method"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.8.6"
+  }
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+ "nbformat": 4,
+ "nbformat_minor": 4
+}