Track 17 · Lesson 3 of 12

Project: inventory manager

Model a shop's stock with classes: validated products, an inventory with stock movements, a custom exception for overselling, an audit history, low-stock alerts, valuation and a stock report.

You will be able to

• Decide which classes a problem needs and what data and behaviour belong to each
• Validate constructor arguments so an object can never be created in an invalid state
• Define and raise a custom exception that carries the details of what went wrong
• Keep an audit history of changes and answer questions from it
• Aggregate object data into alerts, valuations and an aligned report