input: 
  def calculate_circle_area(radius: float = None) -> float:
      """ Calculate the area of a circle given a radius. If the radius is not provided,
      prompt the user to enter the value.
      >>> calculate_circle_area(5)
      78.5
      >>> calculate_circle_area()
      Please enter the radius of the circle: 5
      78.5
      """
      Pi = 3.14
      if radius is None:
          radius = float(input("Please enter the radius of the circle: "))
      area = Pi * radius ** 2
      print("The area of the circle is:", area)
      return area
  
output:     Pi = 3.14
      if radius is None:
          radius = float(input("Please enter the radius of the circle: "))
      area = Pi * radius ** 2
      print("The area of the circle is:", area)
      return area