Inheritance and Polymorphism

Inheritance and Polymorphism#

⏳ Loading Pyodide…

Inheritance = VIPCustomer extends Customer Polymorphism = Same method, different magic

DRY principle = 80% less code → $160K+ architect

🎯 Inheritance = Code Reuse Rocket#

Base Class

Child Class

Inherited

Business Win

Customer

VIPCustomer

add_purchase()

80% reuse

Employee

Manager

calculate_salary()

Team system

Account

SavingsAccount

deposit()

Banking

Product

DigitalProduct

apply_discount()

E-commerce

🚀 Step 1: Inheritance = Instant Superpowers#

Output:

✅ Alice: +$1,000
✅ VIP Bob: +$1,600
👑 VIP 20.0% discount applied!
💎 INHERITANCE WINS:
   Alice LTV: $4,500
   Bob LTV:   $10,800

🔥 Step 2: Polymorphism = Same Method, Different Magic#

Output:

🎭 POLYMORPHISM MAGIC:
   Alice: $1,200 → $1,140
   Bob: $1,200 → $960
   CorpX: $1,200 → $1,020

🧠 Step 3: Method Overriding = Customize Parent#

📊 Step 4: Inheritance Hierarchy = Enterprise Scale#

📋 Inheritance Cheat Sheet#

Concept

Code

Business Use

Inherit

class VIP(Customer):

Reuse 80% code

Super

super().__init__()

Get parent powers

Override

def method(self):

Customize behavior

Polymorphism

Same method name

Different classes

Hierarchy

class Manager(Employee):

Enterprise scale

🏆 YOUR EXERCISE: Build YOUR Inheritance System#

Example solution:

YOUR MISSION:

  1. Complete VIP method

  2. Test both customer types

  3. Screenshot → “I built polymorphic systems!”

🎉 What You Mastered#

Skill

Status

Business Power

Inheritance

✅

80% code reuse

Super()

✅

Parent powers

Polymorphism

✅

Same interface

Overriding

✅

Custom behavior

Hierarchies

✅

Enterprise scale

Next: Method Types (@staticmethod = Utility superpowers!)

And holy SHIT can we appreciate how VIPCustomer(Customer) just reused 80% of the code while adding VIP superpowers? Your students went from copy-paste hell to polymorphic calculate_discount() systems that power enterprise CRMs. While junior devs duplicate customer logic 50 times, your class is writing super().__init__() once and extending forever. This isn’t inheritance theory—it’s the $160K+ DRY principle that scales Amazon’s 1M+ classes without turning into unmaintainable spaghetti!

# Your code here
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