knowing the sum null values in a specific row in pandas dataframe
note:df is syour dataframe 
print(df['emp_title'].isnull().sum())
                                
                            knowing the sum null values in a specific row in pandas dataframe
note:df is syour dataframe 
print(df['emp_title'].isnull().sum())
                                
                            python if column is null then
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
                                
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