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find null values pandas

#Retreieve boolean values of whether or not the given cells of a dataframe are 
#null
df.isnull()
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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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