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sunilzambresunilzambre
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Classes objects inheritance
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‎OOPS-Python.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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"id": "34562270",
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"metadata": {},
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"source": [
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"# Classes & Objects\n",
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"- A Class is an object constructor or a \"blueprint\" for creating objects.<br>\n",
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"- Objects are nothing but an encapsulation of variables and functions into a single entity.<br>\n",
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"- Objects get their variables and functions from classes.<br>\n",
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"- To create a class we use the keyword class.<br>\n",
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"- The first string inside the class is called docstring which gives the brief description about the\n",
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" class.<br>\n",
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"- All classes have a function called which is always executed when the class is being initiated.<br>\n",
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"- We can use function to assign values to object properties or other operations that are necessary to perform when the object is being created<br>\n",
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"- The self parameter is a reference to the current instance of the class and is used to access\n",
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" class variables.<br>\n",
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"- self must be the first parameter of any function in the class<br>\n",
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"- The super() builtin function returns a temporary object of the superclass that allows us to access methods of the base class.<br>\n",
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"- super() allows us to avoid using the base class name explicitly and to enable multiple inheritance."
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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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"id": "8492620c",
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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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"10\n"
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]
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}
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],
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"source": [
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"# Create a class with property \"var1\"\n",
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"class myclass:\n",
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" var1 = 10\n",
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"\n",
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"obj1 = myclass() # Create an object of class \"myclass()\"\n",
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"print(obj1.var1)"
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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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"id": "cafb7464",
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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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"Name :- Sunil\n",
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"Employee ID :- 942194\n",
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"Thanks for joining Neosoft Company Sunil!!\n"
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]
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}
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],
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"source": [
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"#Create an employee class\n",
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"class Employee:\n",
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" def __init__(self, name, empid): # __init__() function is used to assign values\n",
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" self.name = name\n",
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" self.empid = empid\n",
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" def greet(self): # Class Method\n",
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" print(\"Thanks for joining Neosoft Company {}!!\".format(self.name))\n",
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"emp1 = Employee(\"Sunil\", 942194) # Create an employee object\n",
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"print('Name :- ',emp1.name)\n",
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"print('Employee ID :- ',emp1.empid)\n",
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"emp1.greet()"
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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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"id": "3a23246e",
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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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"'Rohit'"
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]
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},
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"execution_count": 3,
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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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"emp1.name = 'Rohit' # Modify Object Properties\n",
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"emp1.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": 4,
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"id": "2b08a434",
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"metadata": {},
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"outputs": [
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{
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"ename": "AttributeError",
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"evalue": "'Employee' object has no attribute 'empid'",
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"output_type": "error",
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"traceback": [
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"\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
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"\u001b[1;31mAttributeError\u001b[0m Traceback (most recent call last)",
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"Cell \u001b[1;32mIn[4], line 2\u001b[0m\n\u001b[0;32m 1\u001b[0m \u001b[38;5;28;01mdel\u001b[39;00m emp1\u001b[38;5;241m.\u001b[39mempid \u001b[38;5;66;03m# Delete Object Properties\u001b[39;00m\n\u001b[1;32m----> 2\u001b[0m \u001b[43memp1\u001b[49m\u001b[38;5;241;43m.\u001b[39;49m\u001b[43mempid\u001b[49m\n",
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"\u001b[1;31mAttributeError\u001b[0m: 'Employee' object has no attribute 'empid'"
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]
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}
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],
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"source": [
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"del emp1.empid # Delete Object Properties\n",
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"emp1.empid"
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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": 5,
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"id": "f0ef5fac",
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"metadata": {},
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"outputs": [
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{
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"ename": "NameError",
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"evalue": "name 'emp1' is not defined",
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"output_type": "error",
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"traceback": [
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"\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
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"\u001b[1;31mNameError\u001b[0m Traceback (most recent call last)",
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"Cell \u001b[1;32mIn[5], line 2\u001b[0m\n\u001b[0;32m 1\u001b[0m \u001b[38;5;28;01mdel\u001b[39;00m emp1 \u001b[38;5;66;03m# Delete the object\u001b[39;00m\n\u001b[1;32m----> 2\u001b[0m \u001b[43memp1\u001b[49m\n",
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"\u001b[1;31mNameError\u001b[0m: name 'emp1' is not defined"
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]
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}
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],
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"source": [
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"del emp1 # Delete the object\n",
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"emp1"
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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": 6,
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"id": "88c319b1",
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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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"Name :- Kartik\n",
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"Employee ID :- 9970\n",
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"Thanks for joining Neosoft Company Kartik!!\n"
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]
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}
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],
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"source": [
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"emp2 = Employee(\"Kartik\", 9970) # Create an employee object\n",
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"print('Name :- ',emp2.name)\n",
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"print('Employee ID :- ',emp2.empid)\n",
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"emp2.greet()"
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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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"id": "24d83028",
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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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"'India'"
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]
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},
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"execution_count": 7,
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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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"emp2.country = 'India' #instance variable can be created manually\n",
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"emp2.country"
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]
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},
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{
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"cell_type": "markdown",
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"id": "7b8759b8",
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"metadata": {},
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"source": [
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"# Inheritance\n",
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"- Inheritance is a powerful feature in object oriented programming.\n",
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"- Inheritance provides code reusability in the program because we can use an existing class\n",
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"- (Super Class/ Parent Class / Base Class) to create a new class (Sub Class / Child Class /Derived Class) \n",
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" instead of creating it from scratch.\n",
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"- The child class inherits data definitions and methods from the parent class which facilitates the reuse of features already available. The child class can add few more definitions or redefine a base class method.\n",
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"- Inheritance comes into picture when a new class possesses the 'IS A' relationship with an existing class. \n",
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"- E.g Student is a person. Hence person is the base class and student is derived class"
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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": 13,
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"id": "ae97e23d",
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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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"Student Details\n",
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"---------------\n",
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"Name :- Sunil\n",
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"Age :- 40\n",
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"Gender :- Male\n",
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"Student ID :- 12345\n",
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"Fees :- 25000\n",
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"\n",
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"Employee Details\n",
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"---------------\n",
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"Name :- Albert\n",
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"Age :- 45\n",
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"Gender :- Male\n",
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"Employee ID :- 6789\n",
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"Salary :- 75000\n"
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]
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}
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],
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"source": [
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"class person: # Parent Class\n",
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" def __init__(self, name , age , gender):\n",
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" self.name = name\n",
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" self.age = age\n",
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" self.gender = gender\n",
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" def PersonInfo(self):\n",
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" print('Name :- {}'.format(self.name))\n",
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" print('Age :- {}'.format(self.age))\n",
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" print('Gender :- {}'.format(self.gender))\n",
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"\n",
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"class student(person): # Child Class\n",
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" def __init__(self,name,age,gender,studentid,fees):\n",
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" person.__init__(self,name,age,gender)\n",
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" self.studentid = studentid\n",
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" self.fees = fees\n",
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" \n",
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" def StudentInfo(self):\n",
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" print('Student ID :- {}'.format(self.studentid))\n",
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" print('Fees :- {}'.format(self.fees))\n",
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"\n",
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"class teacher(person): # Child Class\n",
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" def __init__(self,name,age,gender,empid,salary):\n",
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" person.__init__(self,name,age,gender)\n",
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" self.empid = empid\n",
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" self.salary = salary\n",
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" def TeacherInfo(self):\n",
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" print('Employee ID :- {}'.format(self.empid))\n",
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" print('Salary :- {}'.format(self.salary))\n",
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"\n",
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"stud1 = student('Sunil' , 40 , 'Male' , 12345 , 25000)\n",
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"print('Student Details')\n",
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"print('---------------')\n",
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"stud1.PersonInfo() # PersonInfo() method presnt in Parent Class will be access\n",
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"stud1.StudentInfo()\n",
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"print()\n",
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"teacher1 = teacher('Albert' , 45 , 'Male' , 6789 , 75000)\n",
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"print('Employee Details')\n",
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"print('---------------')\n",
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"teacher1.PersonInfo() # PersonInfo() method presnt in Parent Class will be acc\n",
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"teacher1.TeacherInfo()"
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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": 14,
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"id": "558f40ae",
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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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"Contractual Employee Details\n",
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"****************************\n"
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]
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},
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{
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"ename": "NameError",
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"evalue": "name 'contractual' is not defined",
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"output_type": "error",
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"traceback": [
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"\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
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"\u001b[1;31mNameError\u001b[0m Traceback (most recent call last)",
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"Cell \u001b[1;32mIn[14], line 28\u001b[0m\n\u001b[0;32m 26\u001b[0m \u001b[38;5;28mprint\u001b[39m(\u001b[38;5;124m'\u001b[39m\u001b[38;5;124mContractual Employee Details\u001b[39m\u001b[38;5;124m'\u001b[39m)\n\u001b[0;32m 27\u001b[0m \u001b[38;5;28mprint\u001b[39m(\u001b[38;5;124m'\u001b[39m\u001b[38;5;124m****************************\u001b[39m\u001b[38;5;124m'\u001b[39m)\n\u001b[1;32m---> 28\u001b[0m contract1 \u001b[38;5;241m=\u001b[39m \u001b[43mcontractual\u001b[49m(\u001b[38;5;124m'\u001b[39m\u001b[38;5;124mDilip\u001b[39m\u001b[38;5;124m'\u001b[39m , \u001b[38;5;241m36\u001b[39m , \u001b[38;5;124m'\u001b[39m\u001b[38;5;124mMale\u001b[39m\u001b[38;5;124m'\u001b[39m , \u001b[38;5;241m4507\u001b[39m , \u001b[38;5;241m65000\u001b[39m,\u001b[38;5;124m'\u001b[39m\u001b[38;5;124m21-12-2024\u001b[39m\u001b[38;5;124m'\u001b[39m)\n\u001b[0;32m 29\u001b[0m contract1\u001b[38;5;241m.\u001b[39mPersonInfo()\n\u001b[0;32m 30\u001b[0m contract1\u001b[38;5;241m.\u001b[39memployeeInfo()\n",
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"\u001b[1;31mNameError\u001b[0m: name 'contractual' is not defined"
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]
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}
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],
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"source": [
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"class person: # Parent Class\n",
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" def __init__(self, name , age , gender):\n",
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" self.name = name\n",
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" self.age = age\n",
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" self.gender = gender\n",
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" def PersonInfo(self):\n",
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" print('Name :- {}'.format(self.name))\n",
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" print('Age :- {}'.format(self.age))\n",
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" print('Gender :- {}'.format(self.gender))\n",
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"\n",
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"class employee(person): # Child Class\n",
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" def __init__(self,name,age,gender,empid,salary):\n",
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" person.__init__(self,name,age,gender)\n",
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" self.empid = empid\n",
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" self.salary = salary\n",
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" def employeeInfo(self):\n",
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" print('Employee ID :- {}'.format(self.empid))\n",
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" print('Salary :- {}'.format(self.salary))\n",
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"\n",
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"class fulltime(employee): # Grand Child Class\n",
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" def __init__(self,name,age,gender,empid,salary,WorkExperience):\n",
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" employee.__init__(self,name,age,gender,empid,salary)\n",
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" self.WorkExperience = WorkExperience\n",
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" def FulltimeInfo(self):\n",
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" print('Work Experience :- {}'.format(self.WorkExperience))\n",
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"print('Contractual Employee Details')\n",
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"print('****************************')\n",
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"contract1 = contractual('Dilip' , 36 , 'Male' , 4507 , 65000,'21-12-2024')\n",
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"contract1.PersonInfo()\n",
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"contract1.employeeInfo()\n",
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"contract1.ContractInfo()\n",
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"print('\\n \\n')\n",
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"\n",
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"rint('Fulltime Employee Details')\n",
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"print('****************************')\n",
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"fulltim1= fulltime('Sunil' , 40 , 'Male' , 7021 , 75000, 12)\n",
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"fulltim1.PersonInfo()\n",
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"fulltim1.employeeInfo()\n",
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"fulltim1.FulltimeInfo()"
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]
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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 (ipykernel)",
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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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},
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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": "3.9.12"
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"nbformat": 4,
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