python - How to compare rows in order to fill missing values in pandas -

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i have dataframe 10 fields. in 10th field there missing data, , need fill them.

so let's row, row-a, have 10th field empty. if there row-b such fields 3 7 row-a , row-b have same values, want copy value @ 10th field of row-b 10th field of row-a. , don't know how it.


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