摘要： lines = [(1, 1, '父1节点'), (2, 1, '1-2'), (3, 1, '1-3'), (4, 3, '1-3-4'), (5, 3, '1-3-5'), (6, 3, '1-3-6'), (7, 7, '父7节点'), (8, 7, '7-8'), (9, 7, '7-9') 阅读全文