python - Merging pandas dataframe indices -

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how can 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 obtain

index3 out[8]: int64index([20, 22, 23, 24, 25, 32, 33, 34], dtype='int64')

that contains index1 , index2 without duplicates?

use union

in [1331]: index1.union(index2) out[1331]: int64index([20, 22, 23, 24, 25, 32, 33, 34], dtype='int64')




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