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    "from turtle import * \n",
    "import time\n",
    "\n",
    "def initturtle():\n",
    "        \n",
    "        pencolor('blue')\n",
    "        \n",
    "        speed('slowest')\n",
    "        \n",
    "        tracer(1)\n",
    "        \n",
    "        goto(0,0)\n",
    "        \n",
    "        pendown()\n",
    "\n",
    "\n",
    "def graphword(str):\n",
    "\n",
    "        for char in str:\n",
    "\n",
    "            if char == 'F':\n",
    "                \n",
    "                forward(100)\n",
    "\n",
    "\n",
    "            if char == '-':\n",
    "                \n",
    "                left(90)\n",
    "\n",
    "\n",
    "            if char == '[':  # when you see a '[', save the current 'state' of the turtle\n",
    "                \n",
    "                (xpos, ypos) = position()  # get current turtle position\n",
    "               \n",
    "                angle = heading()  # get current turtle heading angle\n",
    "               \n",
    "                TurtleState = (xpos, ypos, angle)  # form a tuple containing the state of the turtle\n",
    "               \n",
    "                stack.append(TurtleState)  # store turtle state in a stack\n",
    "\n",
    "\n",
    "            if char == ']':  # when you see a ']', restore last stored turtle state\n",
    "                \n",
    "                stackpointer = len(stack) - 1\n",
    "                \n",
    "                (xpos, ypos, angle) = stack[stackpointer]  # retrieve turtle state from stack\n",
    "                \n",
    "                del stack[stackpointer]  # once retrieved, delete from stack\n",
    "                \n",
    "                goto(xpos, ypos)  # use retrieved info to set the coordinates of the turtle\n",
    "                \n",
    "                setheading(angle) # also set heading angle\n",
    "\n",
    "\n",
    "initturtle()          \n",
    "\n",
    "stack = list()\n",
    "\n",
    "graphword('F[-F]F')\n",
    "\n",
    "done()\n",
    "\n"
   ]
  },
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   "execution_count": null,
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