Objects and Classes

• Some Examples of Objects:
  • Printer
  • Table
  • Car
  • Pen
  • Computer
• What can be an object:
  • Any thing that can be object which has
    • Characteristics => What this object does
    • Contents/Attributes => What it has
  • Printer
    • Characteristic => Print, Switch On/Off, Connect to a network
    • Contents/Attributes => Ink, Paper, Machine, Power Supply
  • Car
    • Characteristics => Commute, Start, Stop
    • Contents/Attributes => Colour, Make, Tyres, Engine,
• An object is a data structure that contains data (attributes) and methods (Characteristics)
• A class is a specification of object. Objects are created from classes.
• In python everything is an object
• Lets try to create some Classes
• In Python Class Names should follow Pascal Case
• Refer Here for the sample Printer class skeleton

Lets Design Classes For Movie Ticketing Platform

• The following will be classes
  • Movie: This class will have necessary information to contain a Movie
  • Theatre: This class will have necessary information to contain a Theatre
  • Screen: This class will represent the screen in the theatre
  • Seat: This class represents the seat for sale
  • User: This class will represent a User booking movie tickets
  • Ticket: This class represents a ticket given to the user

Lets Design Classes for Super Market POS (Point of Sale)

• The following will be classes
  • Product: This class represents product for sale
  • Customer:
  • Employee:
  • Bill
  • Feedback
  • Inventory
  • Branch:

Lets Design Classes for the Library Management System

• The following will be the Classes

  • Book:
  • Librarian:
  • Student:
  • Register:
  • Magazines:
  • E-Book:
  • NewsPaper:
  • Faculty:
  • Inventory:
  • LibraryCard:

• Given the Business problem, we can list some of the classes.

• Classes may have relationship b/w them

• Each class will have

  • Characteristic/Behaviour/Method
  • Attribute/Data

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