input: Write a function to edit the given Python code to prompt the user to enter the value of radius to calculate the area of a circle.
  assert calculate_circle_area()==None
  assert input_value == "Please enter the radius of the circle: "
  assert output_value == "The area of the circle is: " + str(Pi * float(radius)**2)
output: def calculate_circle_area():
      radius = input("Please enter the radius of the circle: ")
      Pi = 3.14159
      area = Pi * float(radius)**2
      print("The area of the circle is: " + str(area))