old_contents: """
  Just to check
  """
  
  
  def add(a, b):
      """
      >>> add(2, 2)
      4
      >>> add(2, -2)
      0
      """
      return a + b
  
  
  if __name__ == "__main__":
      a = 5
      b = 6
      print(f"The sum of {a} + {b} is {add(a, b)}")
  
new_contents: """
  Just to check
  """
  
  
  def add(a: float, b: float) -> float:
      """
      >>> add(2, 2)
      4
      >>> add(2, -2)
      0
      """
      return a + b
  
  
  if __name__ == "__main__":
      a = 5
      b = 6
      print(f"The sum of {a} + {b} is {add(a, b)}")
  
subject: Add typing to maths/add.py (#7064)