old_contents: from . import schedule
  
  
  @schedule
  def add(x, y):
      return x + y
  
  
  @schedule
  def sub(x, y):
      return x - y
  
  
  @schedule
  def mul(x, y):
      return x*y
  
  
  @schedule
  def accumulate(lst, start=0):
      return sum(lst, start)
  
new_contents: from . import schedule, schedule_hint
  
  
  @schedule
  def add(x, y):
      return x + y
  
  
  @schedule_hint(display="{a} + {b}", confirm=True)
  def log_add(a, b):
      return a + b
  
  
  @schedule
  def sub(x, y):
      return x - y
  
  
  @schedule
  def mul(x, y):
      return x*y
  
  
  @schedule
  def accumulate(lst, start=0):
      return sum(lst, start)
  
subject: add displaying function to tutorial