split-apply-combine

python pandas, DF.groupby().agg(), column reference in agg() Question: On a concrete problem, say I have a DataFrame DF word tag count 0 a S 30 1 the S 20 2 a T 60 3 an T 5 4 the T 10 I want to find, for every “word”, the “tag” that has the most “count”. …