Compruebe si la columna DataFrame contiene solo alfabetos y no hay espacios y no hay caracteres especiales

df['Last Name Completely Alphabets ?'] = df.apply(lambda x: 1 if x['Last Name'].isalpha() == True else 0, axis = 1)
df['First Name Completely Alphabets ?'] = df.apply(lambda x: 1 if x['First Name'].isalpha() == True else 0, axis = 1)
Troubled Thrush