code: def load_lst(self):
          
          with open(self._lst_file, 'r') as fd:
              lines = fd.readlines()
  
          idx, uname, fname = list(), list(), list()
  
          for line in lines:
              values = line.split(',')
              values = [x.strip() for x in values]
  
              # preserve the idx ordering here in case variables are not
              # ordered by idx
              idx.append(int(values[0]))  # convert to integer
              uname.append(values[1])
              fname.append(values[2])
  
          self._idx = idx
          self._fname = fname
          self._uname = uname
docs: Load the lst file into internal data structures