Python Functions Explained | def, Calling Functions & Basics | MO Academy 2025–2026

Описание: Welcome to MO Academy’s Python Full Course (2025–2026)!
In this lesson, we begin one of the most important and foundational topics in programming — Functions in Python.

Functions allow you to organize code, avoid repetition, improve readability, and build programs that are cleaner, faster, and easier to maintain. Every professional Python project — from web apps to data analysis, automation, and AI — relies heavily on functions.

This video offers a complete, beginner-friendly introduction to how functions work, how to define them, and how to use them confidently in your code.

📘 What You Will Learn in This Lesson
🔹 1. What Is a Function?

You will learn what functions are, why we create them, and how they help reduce code repetition and increase efficiency.

🔹 2. Defining Functions Using def

Understanding the def keyword
Writing your first custom function
Function naming rules
Indentation and scope basics

🔹 3. Calling a Function

How to execute a function
Calling functions multiple times
Using functions inside loops and conditions

🔹 4. Built-in vs User-Defined Functions

You’ll understand the difference and see examples of both types.

🔹 5. Real-World Examples

✔ Creating a calculator function
✔ Greeting function
✔ Automated message function
✔ Beginner project ideas

🧠 Why Functions Matter

Learning functions is essential for:
✔ Writing organized, modular code
✔ Creating reusable logic
✔ Working with large projects
✔ Reducing errors
✔ Preparing for parameters, arguments, and return values (next topic!)

Functions form the backbone of professional Python development, and mastering them early gives you a strong advantage for 2025–2026 and beyond.

▶️ Next Lessons

➡️ Function Parameters & Arguments
➡️ Return Values
➡️ Variable Scope

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