create new column with found val

create new column with found value from column after group by - Stack Overflow
I have data as follow:{'index': [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 49, 50, 51, 52, 53, 54, 55, 5
create new column with found value from column after group byStack Overflow
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