{
"metadata": {
"name": "ch10"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 10 : Inheritance and Polymorphism: Blackjack"
]
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": [
"example 10.1 page no: 334"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"'''\n",
"//Simple Boss\n",
"//Demonstrates inheritance\n",
"'''\n",
"\n",
"class Enemy:\n",
" def __init__(self):\n",
" self.m_Damage = 10\n",
"\n",
" def Attack(self):\n",
" print \"An enemy attacks and inflicts \" , self.m_Damage , \" damage points!\";\n",
" \n",
" def __del__(self):\n",
" print \"In Enemy destructor, deleting m_pDamage.\\n\";\n",
"\n",
"class Boss(Enemy):\n",
" def __init__(self):\n",
" Enemy.__init__(self)\n",
" self.m_DamageMultiplier = 3\n",
"\n",
" def SpecialAttack(self):\n",
" print \"A boss attacks and inflicts \" , (self.m_DamageMultiplier * self.m_Damage),\n",
" print \" damage points!\";\n",
"\n",
"print \"Creating an enemy.\\n\";\n",
"enemy1 = Enemy()\n",
"enemy1.Attack();\n",
"print \"\\nCreating a boss.\\n\";\n",
"boss1 = Boss()\n",
"boss1.Attack();\n",
"boss1.SpecialAttack();"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Creating an enemy.\n",
"\n",
"An enemy attacks and inflicts 10 damage points!\n",
"\n",
"Creating a boss.\n",
"\n",
"An enemy attacks and inflicts 10 damage points!\n",
"A boss attacks and inflicts 30 damage points!\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": [
"example 10.2 page no : 338"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"'''\n",
"//Simple Boss 2.0\n",
"//Demonstrates access control under inheritance\n",
"'''\n",
"\n",
"\n",
"class Enemy:\n",
" def __init__(self):\n",
" self.m_Damage = 10\n",
"\n",
" def Attack(self):\n",
" print \"Attack inflicts \" , self.m_Damage , \" damage points!\";\n",
"\n",
"class Boss(Enemy):\n",
" def __init__(self):\n",
" Enemy.__init__(self)\n",
" self.m_DamageMultiplier = 3\n",
"\n",
" def SpecialAttack(self):\n",
" print \"Special Attack inflicts \" , (self.m_DamageMultiplier * self.m_Damage),\n",
" print \" damage points!\";\n",
"\n",
"print \"Creating an enemy.\\n\";\n",
"enemy1 = Enemy()\n",
"enemy1.Attack();\n",
"print \"\\nCreating a boss.\\n\";\n",
"boss1 = Boss()\n",
"boss1.Attack();\n",
"boss1.SpecialAttack();"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Creating an enemy.\n",
"\n",
"Attack inflicts 10 damage points!\n",
"\n",
"Creating a boss.\n",
"\n",
"Attack inflicts 10 damage points!\n",
"Special Attack inflicts 30 damage points!\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": [
"example 10.3 page no : 343"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"'''\n",
"//Overriding Boss\n",
"//Demonstrates calling and overriding base member functions\n",
"'''\n",
"class Enemy:\n",
" def __init__(self,d=10):\n",
" self.m_Damage = d\n",
"\n",
" def Attack(self):\n",
" print \"Attack inflicts \" , self.m_Damage , \" damage points!\";\n",
"\n",
" def Taunt(self):\n",
" print \"The enemy says he will fight you.\";\n",
" __Attack = Attack \n",
"\n",
"\n",
"class Boss(Enemy):\n",
" def __init__(self,d=30):\n",
" Enemy.__init__(self)\n",
" self.m_DamageMultiplier = d\n",
"\n",
" def SpecialAttack(self):\n",
" print \"Special Attack inflicts \" , (self.m_DamageMultiplier * self.m_Damage),\n",
" print \" damage points!\";\n",
"\n",
" def Taunt(self): #override base class member function\n",
" print \"The boss says he will end your pitiful existence.\"\n",
"\n",
" def Attack(self): #override base class member function\n",
" #call base class member function\n",
" Enemy.Attack(self)\n",
" print \" And laughs heartily at you.\\n\";\n",
"\n",
"\n",
"print \"Enemy object :\";\n",
"enemy1 = Enemy()\n",
"enemy1.Taunt()\n",
"enemy1.Attack();\n",
"print \"\\n boss object.\\n\";\n",
"boss1 = Boss()\n",
"boss1.Taunt()\n",
"boss1.Attack();\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enemy object :\n",
"The enemy says he will fight you.\n",
"Attack inflicts 10 damage points!\n",
"\n",
" boss object.\n",
"\n",
"The boss says he will end your pitiful existence.\n",
"Attack inflicts 10 damage points!\n",
" And laughs heartily at you.\n",
"\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": [
"example 10.4 page no : 341,348"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"'''\n",
"//Polymorphic Bad Guy\n",
"//Demonstrates calling member functions dynamically\n",
"'''\n",
"\n",
"class Enemy:\n",
" def __init__(self,d=10):\n",
" self.m_Damage = d\n",
"\n",
" def Attack(self):\n",
" print \"Attack inflicts \" , self.m_Damage , \" damage points!\";\n",
"\n",
" def __del__(self):\n",
" print \"In Enemy destructor, deleting m_pDamage.\";\n",
" \n",
"class Boss(Enemy):\n",
" def __init__(self,d=30):\n",
" Enemy.__init__(self)\n",
" self.m_DamageMultiplier = d\n",
"\n",
" def SpecialAttack(self):\n",
" print \"Special Attack inflicts \" , (self.m_DamageMultiplier * self.m_Damage),\n",
" print \" damage points!\";\n",
"\n",
" def Taunt(self): #override base class member function\n",
" print \"The boss says he will end your pitiful existence.\"\n",
"\n",
" def Attack(self): #override base class member function\n",
" #call base class member function\n",
" Enemy.Attack(self)\n",
" print \" And laughs heartily at you.\\n\";\n",
"\n",
" def __del__(self):\n",
" Enemy.__del__(self)\n",
" print \"In Boss destructor, deleting m_pMultiplier.\";\n",
" self.m_pMultiplier = 0;\n",
"\n",
"print \"Calling Attack() on Boss object through pointer to Enemy:\"\n",
"pBadGuy = Boss();\n",
"pBadGuy.Attack();\n",
"print \"\\nDeleting pointer to Enemy:\\n\";\n",
"pBadGuy = 0;"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Calling Attack() on Boss object through pointer to Enemy:\n",
"Attack inflicts 10 damage points!\n",
" And laughs heartily at you.\n",
"\n",
"\n",
"Deleting pointer to Enemy:\n",
"\n",
"In Enemy destructor, deleting m_pDamage.\n",
"In Boss destructor, deleting m_pMultiplier.\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": [
"example 10.5 page no : 353"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"'''\n",
"//Abstract Creature\n",
"//Demonstrates abstract classes\n",
"'''\n",
"class Creature :\n",
" def __init__(self,h=100):\n",
" self.m_Health = h\n",
" \n",
" def Greet(self): # pure virtual member function\n",
" pass\n",
"\n",
" def DisplayHealth(self):\n",
" print \"Health: \" , self.m_Health\n",
"\n",
"\n",
"class Orc(Creature):\n",
" def __init__(self,h=120):\n",
" Creature.__init__(self,h)\n",
"\n",
" def Greet(self):\n",
" print \"The orc grunts hello.\\n\";\n",
"\n",
"pCreature = Orc();\n",
"pCreature.Greet();\n",
"pCreature.DisplayHealth();"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The orc grunts hello.\n",
"\n",
"Health: 120\n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": [
"example 10.6, page no : 361-379"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"'''\n",
"defining game class.\n",
"Note : this would give error as we have not initialized player class here.\n",
"'''\n",
"\n",
"ACE = 1\n",
"TWO = 2\n",
"THREE = 3\n",
"FOUR = 4\n",
"FIVE = 5\n",
"SIX = 6\n",
"SEVEN = 7\n",
"EIGHT = 8\n",
"NINE = 9\n",
"TEN = 10\n",
"JACK = 11\n",
"QUEEN = 12\n",
"KING = 13\n",
"\n",
"CLUBS = 0\n",
"DIAMONDS = 1\n",
"HEARTS = 2\n",
"SPADES = 3\n",
"\n",
" \n",
"class Card:\n",
" def __init__(self,r = ACE,s = SPADES,ifu = True): #returns the value of a card, 1 - 11\n",
" self.m_Rank = r\n",
" self.m_Suit = s\n",
" self.m_IsFaceUp =ifu\n",
"\n",
" def GetValue(self):\n",
" #if a cards is face down, its value is 0\n",
" value = 0;\n",
" if (m_IsFaceUp):\n",
" #value is number showing on card\n",
" value = m_Rank;\n",
" #value is 10 for face cards\n",
" if (value > 10):\n",
" value = 10;\n",
" return value;\n",
"\n",
" def Flip(self):\n",
" self.m_IsFaceUp = not (m_IsFaceUp);\n",
"\n",
"class Hand:\n",
" def __init__(self):\n",
" self.m_Cards = []\n",
"\n",
" def __del__(self):\n",
" self.Clear() \n",
"\n",
" def Add(self,pCard):\n",
" self.m_Cards.append(pCard);\n",
"\n",
" def Clear(self):\n",
" #iterate through vector, freeing all memory on the heap\n",
" self.m_Cards = []\n",
"\n",
" def GetTotal(self):\n",
" #if no cards in hand, return 0\n",
" if (self.m_Cards.empty()):\n",
" return 0;\n",
" #if a first card has value of 0, then card is face down; return 0\n",
" if (m_Cards[0].GetValue() == 0):\n",
" return 0;\n",
" #add up card values, treat each ace as 1\n",
" total = 0;\n",
" for i in self.m_Cards:\n",
" total += i.GetValue()\n",
" #determine if hand contains an ace\n",
" containsAce = False;\n",
" for i in self.m_Cards:\n",
" if i.GetValue() == Card.ACE:\n",
" containsAce = True;\n",
"\n",
" #if hand contains ace and total is low enough, treat ace as 11\n",
" if (containsAce and total <= 11):\n",
" #add only 10 since we've already added 1 for the ace\n",
" total += 10;\n",
" return total;\n",
"\n",
"\n",
"class GenericPlayer(Hand):\n",
" def __init__(self,name):\n",
" self.m_Name = name\n",
"\n",
" def __del__(self):\n",
" pass\n",
"\n",
" def IsBusted(self):\n",
" return (self.GetTotal() > 21);\n",
"\n",
" def Bust(self):\n",
" print self.m_Name , \" busts.\";\n",
"\n",
"class Player(GenericPlayer):\n",
" def _init_(self,name):\n",
" GenericPlayer.__init__(self,name)\n",
" \n",
" def _del_(self):\n",
" pass\n",
"\n",
" def IsHitting(self):\n",
" print self.m_Name , \", do you want a hit? (Y/N): \",\n",
" response = raw_input()\n",
" return (response == 'y' or response == 'Y');\n",
"\n",
" def Win(self):\n",
" print self.m_Name , \" wins.\";\n",
"\n",
" def Lose(self):\n",
" print self.m_Name , \" loses.\";\n",
"\n",
" def Push(self):\n",
" print self.m_Name , \" pushes.\";\n",
"\n",
"class House(GenericPlayer):\n",
" def __init__(self,name):\n",
" GenericPlayer.__init__(self,name)\n",
"\n",
" def __del__(self):\n",
" pass\n",
"\n",
" def IsHitting(self):\n",
" return (self.GetTotal() <= 16)\n",
"\n",
" def FlipFirstCard(self):\n",
" if (not self.m_Cards):\n",
" m_Cards[0].Flip();\n",
" else:\n",
" print \"No card to flip!\";\n",
" \n",
"class Deck(Hand):\n",
" def __init__(self):\n",
" self.m_Cards = []\n",
" self.Populate();\n",
" \n",
" def __del__(self):\n",
" pass\n",
" \n",
" def Populate(self):\n",
" self.Clear();\n",
" #create standard deck\n",
" for s in range(Card.CLUBS,Card.SPADES+1):\n",
" for r in range(Card.ACE,Card.KING+1):\n",
" self.Add(Card(r,s))\n",
"\n",
" def Shuffle(self):\n",
" pass\n",
"\n",
" def Deal(self, aHand):\n",
" if (not m_Cards):\n",
" aHand.Add(self.m_Cards[-1]);\n",
" self.m_Cards.pop();\n",
" else:\n",
" print \"Out of cards. Unable to deal.\";\n",
"\n",
" def AdditionalCards(self,aGenericPlayer):\n",
" print ''\n",
" #continue to deal a card as long as generic player isn't busted and\n",
" #wants another hit\n",
" while ( not (aGenericPlayer.IsBusted()) and aGenericPlayer.IsHitting() ):\n",
" self.Deal(aGenericPlayer);\n",
" print aGenericPlayer\n",
" if (aGenericPlayer.IsBusted()):\n",
" aGenericPlayer.Bust();\n",
" \n",
"\n",
"class Game:\n",
" def __init__(self,names):\n",
" #create a vector of players from a vector of names\n",
" self.pName = []\n",
" for i in names:\n",
" self.pName.append(Player(i))\n",
" self.m_Deck.Populate();\n",
" self.m_Deck.Shuffle();\n",
"\n",
" def __del__(self):\n",
" pass\n",
" \n",
" def Play(self):\n",
" # deal initial 2 cards to everyone\n",
" for i in range(2):\n",
" for pPlayer in self.m_Players:\n",
" self.m_Deck.Deal(*pPlayer);\n",
" self.m_Deck.Deal(m_House);\n",
" #hide house's first card\n",
" self.m_House.FlipFirstCard();\n",
" for pPlayer in self.m_Players:\n",
" print pPlayer \n",
"\n",
" print self.m_House\n",
" #deal additional cards to players\n",
" \n",
" for pPlayer in self.m_Players:\n",
" self.m_Deck.AdditionalCards(pPlayer);\n",
"\n",
" #reveal house's first card\n",
" self.m_House.FlipFirstCard();\n",
" print self.m_House;\n",
" #deal additional cards to house\n",
" self.m_Deck.AdditionalCards(m_House);\n",
" if (self.m_House.IsBusted()):\n",
" #everyone still playing wins\n",
" for pPlayer in self.m_Players:\n",
" if ( not (pPlayer.IsBusted()) ):\n",
" pPlayer.Win();\n",
" else:\n",
" #compare each player still playing to house\n",
" for pPlayer in self.m_Players:\n",
" if ( not (pPlayer.IsBusted()) ):\n",
" if (pPlayer.GetTotal() > self.m_House.GetTotal()):\n",
" pPlayer.Win();\n",
" elif (pPlayer.GetTotal() < self.m_House.GetTotal()):\n",
" pPlayer.Lose();\n",
" else:\n",
" pPlayer.Push();\n",
"\n",
" #remove everyones cards\n",
" for pPlayer in self.m_Players:\n",
" pPlayer.Clear();\n",
"\n",
" self.m_House.Clear();\n",
"\n",
"print \"\\t\\tWelcome to Blackjack!\\n\";\n",
"numPlayers = 0;\n",
"while (numPlayers < 1 or numPlayers > 7):\n",
" print \"How many players? (1 - 7): \";\n",
" numPlayers = int(raw_input())\n",
"\n",
"names = []\n",
"name = ''\n",
"for i in range(numPlayers):\n",
" print \"Enter player name: \";\n",
" name = raw_input()\n",
" names.append(name); \n",
"\n",
"print ''\n",
"#the game loop\n",
"aGame = Game(names);\n",
"again = 'y'\n",
"while (again != 'n' and again != 'N'):\n",
" aGame.Play();\n",
" print \"\\nDo you want to play again? (Y/N): \",\n",
" again = raw_input()\n",
"\n",
"#overloads << operator so Card object can be sent to cout\n",
"def print_(aCard):\n",
" RANKS = [\"0\", \"A\", \"2\", \"3\", \"4\", \"5\", \"6\", \"7\", \"8\", \"9\",\"10\", \"J\", \"Q\", \"K\"]\n",
" SUITS = [\"c\", \"d\", \"h\", \"s\"]\n",
" if (aCard.m_IsFaceUp):\n",
" print RANKS[aCard.m_Rank] , SUITS[aCard.m_Suit];\n",
" else:\n",
" print \"XX\";\n",
" \n",
"\n",
"def print__(aGenericPlayer):\n",
" print aGenericPlayer.m_Name\n",
" pCard = []\n",
" if (not aGenericPlayer.m_Cards):\n",
" for pCard in aGenericPlayer.m_Cards:\n",
" print pCard\n",
" \n",
" if (aGenericPlayer.GetTotal() != 0):\n",
" print \"(\" , aGenericPlayer.GetTotal() , \")\";\n",
" else:\n",
" print \"<empty>\";"
],
"language": "python",
"metadata": {},
"outputs": [
{
"ename": "StdinNotImplementedError",
"evalue": "raw_input was called, but this frontend does not support stdin.",
"output_type": "pyerr",
"traceback": [
"\u001b[1;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[1;31mStdinNotImplementedError\u001b[0m Traceback (most recent call last)",
"\u001b[1;32m<ipython-input-11-33b9c51ff816>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[0;32m 63\u001b[0m \u001b[1;32mwhile\u001b[0m \u001b[1;33m(\u001b[0m\u001b[0mnumPlayers\u001b[0m \u001b[1;33m<\u001b[0m \u001b[1;36m1\u001b[0m \u001b[1;32mor\u001b[0m \u001b[0mnumPlayers\u001b[0m \u001b[1;33m>\u001b[0m \u001b[1;36m7\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m 64\u001b[0m \u001b[1;32mprint\u001b[0m \u001b[1;34m\"How many players? (1 - 7): \"\u001b[0m\u001b[1;33m;\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m---> 65\u001b[1;33m \u001b[0mnumPlayers\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mint\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mraw_input\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m 66\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m 67\u001b[0m \u001b[0mnames\u001b[0m \u001b[1;33m=\u001b[0m \u001b[1;33m[\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
"\u001b[1;32m/home/jay/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/IPython/zmq/ipkernel.pyc\u001b[0m in \u001b[0;36m<lambda>\u001b[1;34m(prompt)\u001b[0m\n\u001b[0;32m 343\u001b[0m \u001b[0mraw_input\u001b[0m \u001b[1;33m=\u001b[0m \u001b[1;32mlambda\u001b[0m \u001b[0mprompt\u001b[0m\u001b[1;33m=\u001b[0m\u001b[1;34m''\u001b[0m\u001b[1;33m:\u001b[0m \u001b[0mself\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0m_raw_input\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mprompt\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0mident\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0mparent\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m 344\u001b[0m \u001b[1;32melse\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m--> 345\u001b[1;33m \u001b[0mraw_input\u001b[0m \u001b[1;33m=\u001b[0m \u001b[1;32mlambda\u001b[0m \u001b[0mprompt\u001b[0m\u001b[1;33m=\u001b[0m\u001b[1;34m''\u001b[0m \u001b[1;33m:\u001b[0m \u001b[0mself\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0m_no_raw_input\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m 346\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m 347\u001b[0m \u001b[1;32mif\u001b[0m \u001b[0mpy3compat\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mPY3\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
"\u001b[1;32m/home/jay/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/IPython/zmq/ipkernel.pyc\u001b[0m in \u001b[0;36m_no_raw_input\u001b[1;34m(self)\u001b[0m\n\u001b[0;32m 686\u001b[0m \"\"\"Raise StdinNotImplentedError if active frontend doesn't support\n\u001b[0;32m 687\u001b[0m stdin.\"\"\"\n\u001b[1;32m--> 688\u001b[1;33m raise StdinNotImplementedError(\"raw_input was called, but this \"\n\u001b[0m\u001b[0;32m 689\u001b[0m \"frontend does not support stdin.\") \n\u001b[0;32m 690\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n",
"\u001b[1;31mStdinNotImplementedError\u001b[0m: raw_input was called, but this frontend does not support stdin."
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\t\tWelcome to Blackjack!\n",
"\n",
"How many players? (1 - 7): \n"
]
}
],
"prompt_number": 11
},
{
"cell_type": "code",
"collapsed": false,
"input": [],
"language": "python",
"metadata": {},
"outputs": []
}
],
"metadata": {}
}
]
}