input: 
  def calculate_circle_area() -> None:
      """Ask the user to input the radius of a circle and calculate its area.
      >>> # Test case 1
      >>> # User input: 0
      >>> calculate_circle_area()
      The area of the circle is: 0.0
      >>> # Test case 2
      >>> # User input: 1
      >>> calculate_circle_area()
      The area of the circle is: 3.14
      >>> # Test case 3
      >>> # User input: 5
      >>> calculate_circle_area()
      The area of the circle is: 78.5
      """
      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)
  
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)