Python: Лабораторная работа №18 — Полный разбор

Build Python programs that respond clearly when input is invalid, a record is incomplete, or a file cannot be loaded. This complete Lab 18 walkthrough develops defensive programming techniques through guided examples, three challenges, and a final configuration-loader project. Topics covered: • Handling runtime errors with try and except • Catching specific exceptions such as ValueError and FileNotFoundError • Understanding the roles of else and finally • Validating input before using it • Building a safe division tool • Reading device records defensively • Validating severity levels • Loading and validating configuration data with JSON Follow along to see how exception handling and validation help a program recover from predictable problems and give users useful feedback. Pause to attempt each challenge, test invalid inputs, and compare your solution with the walkthrough.