iat, iloc don't work with no unique index

[zhangruoyu]

import pandas as pd

s = pd.Series(range(5), index=[1,1,2,2,3])
s.iat[2]

which returns array([2, 3], dtype=int64), I think the result should be 2.

s.iloc[2] works, but s.iloc[[2, 3]] raise error.

[jreback]

thanks for the report!