Milestone Project 1- Complete Walkthrough Solution.ipynb

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   "source": [
    "# Milestone Project 1: Full Walk-through Code Solution\n",
    "\n",
    "Below is the filled in code that goes along with the complete walk-through video. Check out the corresponding lecture videos for more information on this code!"
   ]
  },
  {
   "cell_type": "code",
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   "source": [
    "# For using the same code in either Python 2 or 3\n",
    "from __future__ import print_function \n",
    "\n",
    "## Note: Python 2 users, use raw_input() to get player input. Python 3 users, use input()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Step 1: Write a function that can print out a board. Set up your board as a list, where each index 1-9 corresponds with a number on a number pad, so you get a 3 by 3 board representation.**"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
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   "source": [
    "from IPython.display import clear_output\n",
    "def display_board(board):\n",
    "    \n",
    "    clear_output()\n",
    "    print('   |   |')\n",
    "    print(' ' + board[7] + ' | ' + board[8] + ' | ' + board[9])\n",
    "    print('   |   |')\n",
    "    print('-----------')\n",
    "    print('   |   |')\n",
    "    print(' ' + board[4] + ' | ' + board[5] + ' | ' + board[6])\n",
    "    print('   |   |')\n",
    "    print('-----------')\n",
    "    print('   |   |')\n",
    "    print(' ' + board[1] + ' | ' + board[2] + ' | ' + board[3])\n",
    "    print('   |   |')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Step 2: Write a function that can take in a player input and assign their marker as 'X' or 'O'. Think about using *while* loops to continually ask until you get a correct answer.**"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
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   "source": [
    "def player_input():\n",
    "    \n",
    "    marker = ''\n",
    "    while not (marker == 'X' or marker == 'O'):\n",
    "        marker = raw_input('Player 1: Do you want to be X or O?').upper()\n",
    "\n",
    "    if marker == 'X':\n",
    "        return ('X', 'O')\n",
    "    else:\n",
    "        return ('O', 'X')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Step 3: Write a function that takes, in the board list object, a marker ('X' or 'O'), and a desired position (number 1-9) and assigns it to the board.**"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {
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   "outputs": [],
   "source": [
    "def place_marker(board, marker, position):\n",
    "    board[position] = marker"
   ]
  },
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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Step 4: Write a function that takes in a board and checks to see if someone has won. **"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {
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   "source": [
    "def win_check(board,mark):\n",
    "    \n",
    "    return ((board[7] == mark and board[8] == mark and board[9] == mark) or # across the top\n",
    "    (board[4] == mark and board[5] == mark and board[6] == mark) or # across the middle\n",
    "    (board[1] == mark and board[2] == mark and board[3] == mark) or # across the bottom\n",
    "    (board[7] == mark and board[4] == mark and board[1] == mark) or # down the middle\n",
    "    (board[8] == mark and board[5] == mark and board[2] == mark) or # down the middle\n",
    "    (board[9] == mark and board[6] == mark and board[3] == mark) or # down the right side\n",
    "    (board[7] == mark and board[5] == mark and board[3] == mark) or # diagonal\n",
    "    (board[9] == mark and board[5] == mark and board[1] == mark)) # diagonal"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Step 5: Write a function that uses the random module to randomly decide which player goes first. You may want to lookup random.randint() Return a string of which player went first.**"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
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   "source": [
    "import random\n",
    "def choose_first():\n",
    "    if random.randint(0, 1) == 0:\n",
    "        return 'Player 2'\n",
    "    else:\n",
    "        return 'Player 1'"
   ]
  },
  {
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   "metadata": {},
   "source": [
    "**Step 6: Write a function that returns a boolean indicating whether a space on the board is freely available.**"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {
    "collapsed": true
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   "outputs": [],
   "source": [
    "def space_check(board, position):\n",
    "    \n",
    "    return board[position] == ' '"
   ]
  },
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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Step 7: Write a function that checks if the board is full and returns a boolean value. True if full, False otherwise.**"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {
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   "source": [
    "def full_board_check(board):\n",
    "    for i in range(1,10):\n",
    "        if space_check(board, i):\n",
    "            return False\n",
    "    return True"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Step 8: Write a function that asks for a player's next position (as a number 1-9) and then uses the function from step 6 to check if its a free position. If it is, then return the position for later use. **"
   ]
  },
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   "cell_type": "code",
   "execution_count": 11,
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   "source": [
    "def player_choice(board):\n",
    "    # Using strings because of raw_input\n",
    "    position = ' '\n",
    "    while position not in '1 2 3 4 5 6 7 8 9'.split() or not space_check(board, int(position)):\n",
    "        \n",
    "        position = raw_input('Choose your next position: (1-9) ')\n",
    "    return int(position)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Step 9: Write a function that asks the player if they want to play again and returns a boolean True if they do want to play again.**"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {
    "collapsed": true
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   "outputs": [],
   "source": [
    "def replay():\n",
    "    \n",
    "    return raw_input('Do you want to play again? Enter Yes or No: ').lower().startswith('y')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
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   "source": [
    "**Step 10: Here comes the hard part! Use while loops and the functions you've made to run the game!**"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
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     "text": [
      "   |   |\n",
      " O | X | O\n",
      "   |   |\n",
      "-----------\n",
      "   |   |\n",
      " O | X | X\n",
      "   |   |\n",
      "-----------\n",
      "   |   |\n",
      " X | O | X\n",
      "   |   |\n",
      "The game is a draw!\n",
      "Do you want to play again? Enter Yes or No: n\n"
     ]
    }
   ],
   "source": [
    "print('Welcome to Tic Tac Toe!')\n",
    "\n",
    "while True:\n",
    "    # Reset the board\n",
    "    theBoard = [' '] * 10\n",
    "    player1_marker, player2_marker = player_input()\n",
    "    turn = choose_first()\n",
    "    print(turn + ' will go first.')\n",
    "    game_on = True\n",
    "\n",
    "    while game_on:\n",
    "        if turn == 'Player 1':\n",
    "            # Player1's turn.\n",
    "            \n",
    "            display_board(theBoard)\n",
    "            position = player_choice(theBoard)\n",
    "            place_marker(theBoard, player1_marker, position)\n",
    "\n",
    "            if win_check(theBoard, player1_marker):\n",
    "                display_board(theBoard)\n",
    "                print('Congratulations! You have won the game!')\n",
    "                game_on = False\n",
    "            else:\n",
    "                if full_board_check(theBoard):\n",
    "                    display_board(theBoard)\n",
    "                    print('The game is a draw!')\n",
    "                    break\n",
    "                else:\n",
    "                    turn = 'Player 2'\n",
    "\n",
    "        else:\n",
    "            # Player2's turn.\n",
    "            \n",
    "            display_board(theBoard)\n",
    "            position = player_choice(theBoard)\n",
    "            place_marker(theBoard, player2_marker, position)\n",
    "\n",
    "            if win_check(theBoard, player2_marker):\n",
    "                display_board(theBoard)\n",
    "                print('Player 2 has won!')\n",
    "                game_on = False\n",
    "            else:\n",
    "                if full_board_check(theBoard):\n",
    "                    display_board(theBoard)\n",
    "                    print('The game is a tie!')\n",
    "                    break\n",
    "                else:\n",
    "                    turn = 'Player 1'\n",
    "\n",
    "    if not replay():\n",
    "        break"
   ]
  },
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   "cell_type": "markdown",
   "metadata": {
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   },
   "source": [
    "## Good Job!"
   ]
  }
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