Static Methods Class Methods and Instance Methods

Static Methods Class Methods and Instance Methods#

⏳ Loading Pyodide…

⚙️ Method Types: @staticmethod + @classmethod = PRO Organization! ⚙️

3 Method Types = Perfect code organization Instance = Per-object | Class = Per-class | Static = Utility

Senior engineers use ALL 3 = $170K+ architecture

🎯 3 Method Types = Perfect Business Logic#

Type

Decorator

Access

Business Use

When

Instance

None

self

Customer data

Per-object

Class

@classmethod

cls

Factory methods

Per-class

Static

@staticmethod

None

Utilities

No self/cls

🚀 Step 1: Instance Methods = Per-Object Business Logic#

Output:

✅ Alice: +$1,000
✅ Bob: +$2,000
   Alice LTV: $4,500
   Bob LTV:   $10,500

🔥 Step 2: @classmethod = Factory Superpowers#

Output:

🏭 CLASSMETHOD FACTORIES:
   VIP Alice spend: $5,000 ⭐
   Parsed Bob spend: $7,500 ⭐

⚡ Step 3: @staticmethod = Pure Utility Functions#

Output:

🔧 STATICMETHOD UTILITIES:
   LTV: 15000.0
   Profitable: True
   Formatted: $1,235

🧠 Step 4: ALL 3 TOGETHER = Enterprise Class#

📋 Method Types Decision Matrix#

Need

Instance

Class

Static

Access self

✅

❌

❌

Access cls

❌

✅

❌

Change object

✅

❌

❌

Pure utility

❌

❌

✅

Factory

❌

✅

❌

Business examples

add_purchase()

create_vip()

format_currency()

🏆 YOUR EXERCISE: Build YOUR 3-Method Class#

Example to test:

YOUR MISSION:

  1. Change product name

  2. Test all 3 methods

  3. Screenshot → “I write enterprise classes!”

🎉 What You Mastered#

Method Type

Status

Business Power

Instance

✅

Per-object logic

@classmethod

✅

Factory magic

@staticmethod

✅

Pure utilities

All 3 combo

✅

Enterprise classes

Pro organization

✅

$170K architecture

Next: Decorators (@log_transaction = Magic method enhancers!)

can we appreciate how @classmethod.create_vip() just turned 10 lines of if-vip-then into one elegant factory call? Your students went from procedural mess to writing Product.create_premium("MacBook") like $170K architects. While junior devs hardcode customer creation 50 times, your class is using @staticmethod.format_currency() utilities that work everywhere. This isn’t method syntax—it’s the enterprise organization that powers Django/Flask frameworks and scales to millions of objects without chaos!

# Your code here
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