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

import pandas as pd

​

# Assuming the dataframe is already defined as "df" and the column name is "column_name"

​

# Check if the column contains any null values

if df['column_name'].isnull().values.any():

    print("The column contains null values.")

else:

    print("The column does not contain any null values.")