Some combination of the above: GroupBy will examine the results of the apply step and try to return a sensibly combined result if it doesn’t fit into either of the above two categories. Since the set of object
I know it is not a problem per se but I think there should be some pandas built in solution for this problem, as no simple function exists for this. It is largely discussed here with various ideas (https://stackoverflow.com/questions/12680754/split-pandas-dataframe-string-entry-to-separate...