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‎.ipynb_checkpoints/OOPS-checkpoint.ipynb‎

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