Advanced Inventory Management App We have already built a basic inventory management system . Now, we are going to extend it into a full-featured app that demonstrates many advanced Python concepts in practice. This will give you a strong foundation before moving into larger systems like APIs, frameworks, or even AI-based workflows. What We Will Cover In this extended version, we will build the app step by step. Each step focuses on a specific advanced Python concept and shows how it fits into the project. 1. Custom Exceptions in Inventory App Define meaningful exception classes like , , Use them to improve error handling instead of just generic 2. Search & Filter Search items by partial name match Filter inventory by price range or stock quantity 3. Sorting Inventory Sort items by name, price, stock, or total value Use Python’s powerful with custom keys 4. Reports & Summaries Generate reports like total stock value, most expensive item, average price Useful for business insights 5. Persistence & Backup Store data in JSON Add automatic backup with timestamp to avoid data loss 6. Iterators & Generators in Inventory Use a generator to yield items that meet conditions (e.g., low stock alerts) 7. Final App – Bringing It All Together A CLI-based app that combines all these features into a structured, modular project Goal of this Section By the end, you will: Be confident in applying advanced Python concepts in real projects Understand how to structure a multi-module application See how features like custom exceptions, sorting, filtering, and persistence make an app production-ready Have a reusable project you can extend further (add database, API, or UI later) Next, let’s start with Custom Exceptions in Inventory App .