input: def calculate_circle_area() -> None:
      """Calculate the area of a circle by prompting the user to enter the radius.
      >>> # Simulate user input
      >>> import io
      >>> import sys
      >>> sys.stdout = io.StringIO()
      >>> input = "5.0"
      >>> 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)