old_contents: score = 76
  if score < 60:
      grade = 'F'
  elif score < 70:
      grade = 'D'
  elif score < 80:
      grade = 'C'
  elif score < 90:
      grade = 'B'
  else:
      grade = 'A'
  print(grade)
  
new_contents: score = 76
  grades = [
      (60, 'F'),
      (70, 'D'),
      (80, 'C'),
      (90, 'B'),
  ]
  print(next((g for x, g in grades if score < x), 'A'))
  
subject: Replace swith statement with a mapping