Get your own Python server
Python code
data.csv
 
  --------BEFORE--------
          age  qualified
  Sally    50       True
  Mary     40      False
  John     30      False
  Monica   40      False
  --------AFTER--------
          age qualified
  Robert  NaN       NaN
  Cindy   NaN       NaN
  Chloe   NaN       NaN
  Pete    NaN       NaN