Build a Data Processor: Your First Real Python Project

You have been learning individual tools for fourteen posts. Variables. Loops. Functions. Classes. Files. Error handling. Modules. All separate. All practiced in isolation. Now you stop practicing in isolation. This post is a real project. Not a toy example. A complete data processing program that reads student records from a CSV file, cleans the data, calculates statistics, finds the top performers, flags who failed, and writes a summary report. Every piece of Python you learned gets used here.