Python Day 80: Defining Functions in Python - Learn How to Use the def Keyword
23 April 2026·5 min
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Welcome to Day 80 of The Complete Python Bootcamp.
In this session, you will explore how to define functions in Python using the def keyword, a core skill for writing structured and reusable code.
Functions allow you to organise your logic into clear, reusable blocks. Today, you will learn the correct syntax for creating functions, how to pass arguments into functions and how to structure your code so it is easier to read, maintain and reuse.
By understanding how to define functions properly, you will begin building your own tools to simplify tasks and improve the overall design of your programs.
By the end of this lesson, you will confidently create and use your own functions in Python.
✅ What You Will Learn in Day 80
• How to define a function using the def keyword
• The correct syntax for creating functions
• How to pass arguments into a function
• How to structure reusable code blocks
• Practical examples of building your own functions
• How functions improve code organisation
This session builds directly on your introduction to functions and modular programming.
🌍 Why Defining Functions Matters
Understanding how to define functions helps you:
• Write reusable and modular code
• Reduce repetition in your programs
• Improve readability and structure
• Simplify complex tasks
• Build scalable and maintainable applications
Functions are essential for clean, professional Python development.
🎯 Who This Lesson Is For
• Beginners learning Python step by step
• Learners starting to build their own functions
• Students preparing for development or data roles
• Anyone wanting to write cleaner and more structured code
• Viewers who enjoy practical examples and clear explanations
This lesson prepares you for arguments, return values and more advanced function concepts.
🔥 Start Building Your Own Functions
Once you understand how to define functions, you gain the ability to create reusable tools within your code.
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🔎 Keywords
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