一个 Dataframe 名为 A
a b c e k g
0 1 2 3 4 5 6
1 1 2 3 4 6 6
2 2 2 3 4 1 2
3 3 4 4 4 1 2
一个二维数组
[[1 2 3]
[1 2 3]
[2 2 3]
[3 4 4]]
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一个二维数组
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