input: 
  def calculate_circle_area():
      """
      Prompts the user to enter the radius of a circle, calculates the area using the formula A = πr², 
      and prints the calculated area.
      >>> # Assuming the user enters '5' when prompted for the radius
      >>> calculate_circle_area()
      Please enter the radius of the circle: The area of the circle is: 78.5
      """
  
output:     radius = float(input("Please enter the radius of the circle: "))
      area = 3.14159 * radius ** 2
      print(f"The area of the circle is: {area}")