Week 4 · Python foundations

Functions and debugging

Good builders make parts they can test separately: a wheel, a motor, a switch. In code those parts are functions. Today you build the first version of Project 1, a grade calculator, out of small functions — and learn how professionals hunt bugs.

Software, data and AI90 minutesBeginnerLevel 1 module

In this lesson you will

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Define functions with parameters and return values
Explain why splitting a program into functions makes it easier to test and fix
Use a repeatable debugging routine (read, reproduce, isolate, fix, retest)
Write simple automated checks with assert

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Functions and debugging

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