text: # Ref : https://www.geeksforgeeks.org/python-plotting-fibonacci-spiral-fractal-using-turtle/
  # Python program for Plotting Fibonacci
  # spiral fractal using Turtle
  import math
  import turtle
  
  
  def fib_plot(n):
      a = 0
      b = 1
      square_a = a
      square_b = b
  
      # Setting the colour of the plotting pen to blue
      x.pencolor("blue")
  
      # Drawing the first square
      x.forward(b * factor)
      x.left(90)
      x.forward(b * factor)
      x.left(90)
      x.forward(b * factor)
      x.left(90)
      x.forward(b * factor)
  
      # Proceeding in the Fibonacci Series
      temp = square_b
      square_b = square_b + square_a
      square_a = temp
  
      # Drawing the rest of the squares
      for i in range(1, n):
          x.backward(square_a * factor)
          x.right(90)
          x.forward(square_b * factor)
          x.left(90)
          x.forward(square_b * factor)
          x.left(90)
          x.forward(square_b * factor)
  
          # Proceeding in the Fibonacci Series
          temp = square_b
          square_b = square_b + square_a
          square_a = temp
  
      # Bringing the pen to starting point of the spiral plot
      x.penup()
      x.setposition(factor, 0)
      x.seth(0)
      x.pendown()
  
      # Setting the colour of the plotting pen to red
      x.pencolor("red")
  
      # Fibonacci Spiral Plot
      x.left(90)
      for i in range(n):
          print(b)
          fdwd = math.pi * b * factor / 2
          fdwd /= 90
          for j in range(90):
              x.forward(fdwd)
              x.left(1)
          temp = a
          a = b
          b = temp + b
  
  
  if __name__ == "__main__":
      # factor which expands or shrinks the scale of the plot by a certain factor.
      factor = 1
  
      # Iterations our Algorithm will run
      nbre = 12
  
      # Plotting the Fibonacci Spiral Fractal and printing the corresponding Fibonacci Number
      print("Fibonacci series for", nbre, "elements :")
      x = turtle.Turtle()
      x.speed(100)
      fib_plot(nbre)
      turtle.done()
  