How can I merge 2 indices
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')
so to obtain
index3
Out[8]: Int64Index([20, 22, 23, 24, 25, 32, 33, 34], dtype='int64')
that contains the index1 and index2 without duplicates?
Use union
In [1331]: index1.union(index2)
Out[1331]: Int64Index([20, 22, 23, 24, 25, 32, 33, 34], dtype='int64')