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    "# Battleship\n",
    "### You can learn a lot when you are having fun - [Gerard Gorman](http://www.imperial.ac.uk/people/g.gorman)"
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    "import random\n",
    "\n",
    "def create_board(size):\n",
    "    ''''Initialise the board using a Python list.'''\n",
    "    board = []\n",
    "    for x in range(0, size):\n",
    "        board.append([\"O\"] * size)\n",
    "    return board\n",
    "\n",
    "def print_board(board):\n",
    "    '''Print out the current board.'''\n",
    "    for row in board:\n",
    "        print(\" \".join(row))\n",
    "    return\n",
    "\n",
    "def generate_ship(max_ship_size, board_size):\n",
    "    # We are going to define a ship as a list of board coordinates.\n",
    "    ship = []\n",
    "    \n",
    "    # Randomly select define the size of the ship.\n",
    "    ship_size = random.randint(1, max_ship_size)\n",
    "    \n",
    "    # Randomly define the orientation.\n",
    "    orientation = random.randint(0, 1)\n",
    "\n",
    "    # Randomly select the seed point for the ship.\n",
    "    iseed = random.randint(0, board_size)\n",
    "    jseed = random.randint(0, board_size)\n",
    "\n",
    "    # Generate ship - here I'm not going to worry if it goes off the edge.\n",
    "    if orientation==0:\n",
    "        for i in range(ship_size):\n",
    "            ship.append((iseed+i, jseed))\n",
    "    else:\n",
    "        for j in range(ship_size):\n",
    "            ship.append((iseed, jseed+j))\n",
    "\n",
    "    return ship\n",
    "            \n",
    "# Set the size of the board and initialise the board.\n",
    "board_size = 10\n",
    "board = create_board(board_size)\n",
    "print_board(board)\n",
    "\n",
    "# Add the ship\n",
    "ship = generate_ship(6, board_size)\n",
    "\n",
    "print(\"Let's play Battleship!\")\n",
    "\n",
    "for turn in range(4):\n",
    "    try:\n",
    "        row = int(input(\"Guess row:\"))\n",
    "        if row<0 or row>board_size-1:\n",
    "            raise ValueError\n",
    "    except:\n",
    "        print(\"Value must be an integer between 0 and %d. Try again.\"%(board_size))\n",
    "        continue\n",
    "\n",
    "    try:\n",
    "        column = int(input(\"Guess column:\"))\n",
    "        if column<0 or column>board_size-1:\n",
    "            raise ValueError\n",
    "    except:\n",
    "        print(\"Value must be an integer between 0 and %d. Try again.\"%(board_size))\n",
    "        continue\n",
    "        \n",
    "    if (row, column) in ship:\n",
    "        print(\"Congratulations! You sunk my battleship!\")\n",
    "        break\n",
    "    else:\n",
    "        if turn == 3:\n",
    "            board[row][column] = \"X\"\n",
    "            print_board(board)\n",
    "            print(\"Game Over\")\n",
    "        else:\n",
    "            board[row][column] = \"X\"\n",
    "            print_board(board)"
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