Python Classroom Notes – 28/April/2024

Object Oriented Programming using Python

• Refer Here for basics of OOP

• Basic constructs of OOP

  • class
  • object
  • attributes/members
  • methods

• objects represent litrerally anything (few examples below)

  • bank account
  • car
  • engine
  • movie
  • theatre
  • transcation

• object will have contents and charecteristics

  • laptop:
    • contents: (What it has) => members
      • cpu
      • ram
      • disk
      • monitor
      • keyboard
    • charecteristics: (What it does) => methods
      • started
      • stopped
      • browse
      • run applications
  • bank account
    • contents: (What it has) => members
      • id
      • name
      • address
      • mobile
      • email
      • balance
      • type
    • characteristics: => methods
      • deposit
      • withdraw
      • close

• Class: This is a design/template of object, we use class to create objects.

• Easiest way to represnt classes is uml diagram Refer Here

• oop in python

  • Real Python Refer Here
  • Programiz Refer Here

• Refer Here for basic oop in python

Problem 1:

• Lets create a demonstration of Bank Account

"""
This module will have Bank Account class
"""

class BankAccount:
    """
    This class will have basic Bank Account Functionality
    """
    def __init__(self, account_number:str,name:str, initial_deposit:float = 0) -> None:
        """
        This method initializes the object with initial values
        """
        self.account_number = account_number
        self.name = name
        self.balance = initial_deposit

    def withdraw(self, amount):
        """
        This method withdraw amount
        """
        self.balance -= amount

    def deposit(self, amount):
        """
        This method deposits amount
        """
        self.balance += amount

• Debug the account creation, deposits and withdrawls. Always print the balance
• Refer Here for the project structure.

Objects: Inheritence (is-a), composition (has-a)

• Refer Here for tutorial on Inheritance and composition

Problem 2

• We have two types of bank accounts
  • savings account
    • donot allow deposits more than 1 Million or 10 lakhs
    • dont allow negativ balance
  • Current account
    • allow deposits of any amount
    • allow negative balance
• Refer Here for changes

Problem 3

• Create Student and Course implemenation according to any institute and design classes. Refer Here for changes