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    "# -*- coding: utf-8-sig -*-\n",
    "\n",
    "# Source: http://www.daniweb.com/software-development/python/code/216557/turtle-graphics-python\n",
    "# Official python-turtle documentation: http://docs.python.org/2/library/turtle.html\n",
    "\n",
    "from turtle import *\n",
    "import time\n",
    "\n",
    "speed(\"slowest\")  #option 'fastest' will be handy for long iterations\n",
    "\n",
    "tracer(1)  # only the nth screen update is shown. Set to 0 to turn tracer off.\n",
    "\n",
    "# The pen/turtle starts at the center (x=0, y=0) of the turtle display area by default.\n",
    "\n",
    "pencolor(\"green\")\n",
    "\n",
    "# While the pen is up, turtle can't draw; this is useful if you want the turtle to \n",
    "# go to a different location.\n",
    "\n",
    "penup()\n",
    "\n",
    "# Have the turtle go to the center of the screen\n",
    "goto(0,0)\n",
    "\n",
    "# put the pen down so the turtle can draw\n",
    "pendown()\n",
    "\n",
    "# Draw a circle with radius = 50 units. \n",
    "# The turtle doesn't draw the circle with its center at (0,0) however; it only draws\n",
    "# a circle that passes through the point (0,0).\n",
    "circle(50)\n",
    "\n",
    "time.sleep(2)  # wait for 2 seconds\n",
    "\n",
    "# draw blue 100x100 squares\n",
    "pencolor(0.9,0.3,0.7)  #(red,green,blue) triplet\n",
    "\n",
    "# At this point, by default, the turtle is facing east (right)\n",
    "for deg in range(0, 61, 20):\n",
    "    \n",
    "    right(90 + deg)  # turn right by angle = 90 + deg\n",
    "    \n",
    "    forward(100)  # step forward by 100 units while drawing a line\n",
    "    \n",
    "    right(90)\n",
    "    \n",
    "    forward(100)\n",
    "    \n",
    "    right(90)\n",
    "    \n",
    "    forward(100)\n",
    "    \n",
    "    right(90)\n",
    "    \n",
    "    forward(100)\n",
    "    \n",
    "    time.sleep(1)\n",
    "    \n",
    "    ps = pensize()  # get curent size of pen\n",
    "    \n",
    "    pensize(ps + 1)  # set new size of pen\n",
    "    \n",
    "penup()\n",
    "\n",
    "goto(-150,-120)\n",
    "\n",
    "color(\"red\")\n",
    "\n",
    "write(\"Done!\")\n",
    "\n",
    "#IMPORTANT: if you don't do the following, the window might freeze\n",
    "done()  \n",
    "\n",
    "#finally close the window to release the console\n"
   ]
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