You have a pandas dataframe like: df = pd.dataframe({''b1: [[23, 18, 33], [12, 10, 3]], 'b2': [[12, 16, 19], [7, 8, 4]]}).

How to merge two array columns in dataframe into one?

The result should be like df2 = {'b': [[23, 18, 33, 12, 16, 19], [12, 10, 3, 7, 8, 4]]}