input: def calculate_circle_area():
      """
      Prompt the user to enter the value of radius to calculate the area of a circle.
      Then calculate the area using the formula πr² and print the result.
      >>> calculate_circle_area() # Assuming user inputs '5' when prompted
      Please enter the radius of the circle: 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)