合并pandas数据帧索引

Question

如何合并2个索引

index1
Out[8]: Int64Index([22, 23, 24, 25, 32, 33, 34], dtype='int64')

index2
Out[8]: Int64Index([20, 23, 24, 25, 32, 33, 34], dtype='int64')

所以要获得

index3
Out[8]: Int64Index([20, 22, 23, 24, 25, 32, 33, 34], dtype='int64')

包含index1和index2没有重复项？

Answer 1

使用union

In [1331]: index1.union(index2)
Out[1331]: Int64Index([20, 22, 23, 24, 25, 32, 33, 34], dtype='int64')

Answer 2

使用逻辑OR符号（|）获取两个索引之间的唯一集合。

>>> index1 | index2
Int64Index([20, 22, 23, 24, 25, 32, 33, 34], dtype='int64')