Hey everybody 
Given a DataFrame df with columns I, A and C. Is there an way to set I as row index such that I can use df[i,:]or df[i,a] with i in I and a in A.
No, that is not possible in DataFrames.
You can do groupby(df, :I) or groupby(df, [:I, :A]) and index this object, but when indexed it will return a SubDataFrame not a single row.
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Is that something what we need?