PYTHON Tutorial

🔒 Constants in Python

Python does not have built-in constant types like some other languages. However, by convention, constants are defined using all uppercase letters, and they should not be changed once defined.

✅ Declaring Constants

PI = 3.14159
MAX_USERS = 100
APP_NAME = "Technorank"
  

These values should not be modified in your program.

📦 Constants in a Module

You can store constants in a separate file (e.g., constants.py) and import them:

# constants.py
API_KEY = "123ABC"
TIMEOUT = 30

# main.py
import constants

print(constants.API_KEY)
  

⚠️ Python Doesn’t Enforce Constants

Python allows you to reassign a constant (but it's discouraged):

PI = 3.14
PI = 4   # ❌ Not recommended!