How to fill dataframe Nan values with empty list [] in pandas?

Question

This is my dataframe:

          date                          ids
0     2011-04-23  [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,...
1     2011-04-24  [0,         


        

Answer 1

Maybe more dense:

df['ids'] = [[] if type(x) != list else x for x in df['ids']]