Order with OrderLines

Challenge on lesson: Checkpoint: Domain Modeling

CHALLENGE

Difficulty: intermediate+25 XP

Define a dataclass OrderLine(sku, quantity, unit_price) and a class Order that starts empty. add_line(sku, quantity, unit_price) appends an OrderLine and returns the line count (raise ValueError if quantity <= 0). total() sums quantity * unit_price. repr(Order()) must contain 'Order'.

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