我有一个包含以下内容的文件:
X1, y1,50
X1, y2,20
X1, y3,30
X1, y4,40
X1, y1,70
X1, y2,40
X1, y3,60
X1, y4,80
X3, y1,100
X3, y2,200
X3, y3,300
X3, y4,400
X3, y1,500
X3, y2,600
X3, y3,700
X3, y4,800
X3, xx, d
如何以以下结构从上述数据创建列表:[[X1,[50,20,30,40],[-1],[70,40,60,80],[-1]],[X2,[100,200,300,400],[-1], [500,600,700,800