Defining with def

Concepts: pyFuncDef

Why Use Functions? Before diving deeper into function syntax, it is important to understand why functions matter so much in professional software development. Consider a data pipeline that processes customer orders. Without functions, you might write the same validation logic in dozens of places: check if the order ID is valid, verify the customer exists, confirm the product is in stock, calculate taxes, and format the receipt. Each copy is an opportunity for bugs and inconsistencies. Function Naming Conventions Indentation: Function Body Python uses indentation to determine which code belongs to a function. Every line in the function body must be indented by the same amount, typically four spaces. This is not just a style preference; Python requires consistent indentation. When you reduce