Python Functions Made Simple — Write Reusable Code
Welcome to Day 3 of the mister tech Python beginner series.
Today you’ll learn one of the most important programming concepts: functions — how to write code once and reuse it anywhere.
In this practical 4-minute lesson, we build together step by step and learn:
• How to define and call functions in Python
• How to pass parameters into a function
• The difference between printing and returning values
• Why functions help avoid repetition
• How to write clean, single-purpose functions
We also implement two real examples:
greet(name)
is_even(number)
This lesson is designed for beginners who want to understand how developers structure real programs — not just memorize syntax.
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Practice Exercise:
Create a Python file that:
• Defines the greet(name) function
• Defines the is_even(number) function
• Tests both functions
• Explains how functions make code reusable
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