📅  最后修改于: 2022-03-11 14:46:48.484000             🧑  作者: Mango
df['real_lastName'] = np.where(df['LastName'].isnull(), df['Middle'], df['LastName'] )
print (df)
FirstName Middle LastName real_lastName
0 Tom Ju NaN Ju
1 Kity NaN Rob Rob