input: 
  def calculate_circle_area() -> float:
      """
      Prompt the user to input the radius of a circle and calculate its area using the formula A = πr².
      
      >>> calculate_circle_area()
      Please enter the radius of the circle: 5
      The area of the circle is: 78.5
      78.5
      >>> calculate_circle_area()
      Please enter the radius of the circle: 7.2
      The area of the circle is: 162.7776
      162.7776
      """
      Pi = 3.14
      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
      radius = float(input("Please enter the radius of the circle: "))
      area = Pi * radius ** 2
      print("The area of the circle is:", area)
      return area