check if column exists in dataframe
if 'A' in df.columns:check if column exists in dataframe
if 'A' in df.columns: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 RobCopyright © 2021 Codeinu
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