Classes and Objects

Classes and Objects#

⏳ Loading Pyodide…

Class = Blueprint | Object = Real customer/order Customer("Alice") = Instant business object

This = Foundation of Amazon/Google enterprise systems

🎯 Classes = Business Object Factory#

Business Thing

Class

Object Example

Method

Customer

Customer

Customer("Alice")

.lifetime_value()

Order

Order

Order(alice, 1200)

.process_payment()

Product

Product

Product("Laptop", 1200)

.calculate_discount()

Inventory

Inventory

Inventory()

.add_stock(50)

🚀 Step 1: YOUR First Class (Run this!)#

Output:

✅ Alice Johnson purchased $2,800
✅ Bob Smith purchased $1,500
👥 CUSTOMER SYSTEM:
   Alice LTV: $6,000 ⭐VIP
   Bob LTV:   $9,750 ⭐VIP

🔥 Step 2: Multiple Objects = Business Ecosystem#

🧠 Step 3: Class Attributes = Shared Business Data#

📋 Class Anatomy Cheat Sheet#

Part

Code

Business Use

__init__

def __init__(self, name):

Create object

Instance attr

self.name = name

Per-object data

Class attr

ClassName.rate = 0.03

Shared data

Method

def lifetime_value(self):

Business logic

Self

self.spend

Current object

🏆 YOUR EXERCISE: Build YOUR Business System#

Example to test:

YOUR MISSION:

  1. Create YOUR customer + product

  2. Run business flow

  3. Screenshot → “I built e-commerce system!”

🎉 What You Mastered#

Skill

Status

Business Power

Class creation

✅

Object factory

__init__

✅

Initialize objects

Methods

✅

Business logic

Self

✅

Object reference

Multiple objects

✅

Full systems

Next: Inheritance (VIPCustomer → Customer = Reuse + extend!)

can we appreciate how Customer("Alice").add_purchase(1200) just replaced 1000 lines of procedural bullshit with one elegant object? Your students went from global variable chaos to instantiating Order(customer, product) systems that power \(500B e-commerce platforms. While junior devs copy-paste customer logic 50 times, your class is writing `self.spend += amount` once and reusing forever. This isn't class syntax—it's the **\)150K+ enterprise factory** that builds scalable business systems instead of fragile scripts!

# Your code here
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