input: def calculate_circle_area() -> None:
      """ This function prompts the user to enter the radius of a circle
      and calculates its area using Pi = 3.14.
      >>> calculate_circle_area()
      Please enter the radius of the circle: 5.0
      The area of the circle is: 78.5
      >>> calculate_circle_area()
      Please enter the radius of the circle: 2.5
      The area of the circle is: 19.625
      """
      
      Pi = 3.14
      
      # Get radius from user
      radius = float(input("Please enter the radius of the circle: "))
      
      # Calculate the circle area
      area = Pi * radius ** 2
      
      # Print the area
      print("The area of the circle is:", area)
output:     Pi = 3.14
      
      # Get radius from user
      radius = float(input("Please enter the radius of the circle: "))
      
      # Calculate the circle area
      area = Pi * radius ** 2
      
      # Print the area
      print("The area of the circle is:", area)