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enumerate(row) if x==identity]\n    rows,cols=zip(*coordinates)\n    boxes[identity]=(min(cols),min(rows),max(cols)+1,max(rows)+1)\nprint('实例图:'); [print(row) for row in instance]\nprint('语义图:'); [print(row) for row in semantic]\nprint('框(x0,y0,x1,y1；右/下边界不含):',boxes)\nassert semantic[1][2]==semantic[1][3]==1\nassert instance[1][2]!=instance[1][3]\n```","sha256":"97c6ebeeb2c6145e77f6ee50a38a0c718cf6a9716c5cb81ef7e2d329dbdc61b0","chapter":{"id":"course","title":"6. 活动：类别图与实例图怎样不同？ · 实现代码"},"unit":{"id":"notebook-blocks/a77753adddda4578b9601eba650283c3","title":"6. 活动：类别图与实例图怎样不同？ · 实现代码"},"page":{"id":"reading-opening","title":"6. 活动：类别图与实例图怎样不同？ · 实现代码","number":1},"sectionTitle":"6. 活动：类别图与实例图怎样不同？ · 实现代码","currentQuestion":"6. 活动：类别图与实例图怎样不同？ · 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