input: 
  def calculate_circle_area() -> float:
      """ 
      Prompts the user to enter the radius of a circle and calculates the area of the circle.
      >>> calculate_circle_area()
      Please enter the radius of the circle: 5
      78.5
      """
      Pi = 3.14
      radius = float(input("Please enter the radius of the circle: "))
      area = Pi * radius ** 2
      print(area)
      return area
  
output:     Pi = 3.14
      radius = float(input("Please enter the radius of the circle: "))
      area = Pi * radius ** 2
      print(area)
      return area