[Numpy-discussion] np.where and ZeroDivisionError: float division by zero

0 In my code, I use the following calculation for a column in the dataframe: np.where(df_score['number'] ! = 0, 100 - ((100 * df_score[rank_column] -50)/df_score['number']), None),I have used df_score['number']! = 0, but the code is still wrong, ZeroDivisionError: float division by zero, even if I put df_score['number']! = 0 changed to df_score['number'] > 0, why? pandas version:1.1.5 numpy version:1.24.4 Here are my numbers： 12.00000 12.00000 12.00000 12.00000 12.00000 0.00000 0.00000 0.00000 0.00000 0.00000 12.00000 12.00000 12.00000 I want to know why it went wrong and what should be done to fix it? Thank you for your help