{
 "metadata": {
  "name": ""
 },
 "nbformat": 3,
 "nbformat_minor": 0,
 "worksheets": [
  {
   "cells": [
    {
     "cell_type": "heading",
     "level": 1,
     "metadata": {},
     "source": [
      "1: Overview of Data Structures and Algorithms"
     ]
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 1: Page 20"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "class Thermostat:\n",
      "\t\"\"\"A simple thermostat class\"\"\"\n",
      "    \n",
      "\t#since private instance variables don't exist in Python,\n",
      "    #hence using a convention: name prefixed with an underscore, to treat them as non-public part\n",
      "\t_currentTemp = 0.0\n",
      "\t_desiredTemp = 0.0\n",
      "\n",
      "\tdef furnace_on(self):\n",
      "\t\t#method body goes here\n",
      "\t\tpass\n",
      "\n",
      "\tdef furnace_off(self):\n",
      "\t\t#method body goes here\n",
      "\t\tpass\n",
      "    \n",
      "#end class Thermostat"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 1
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 2: Page 22"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "#demonstrates basic OOP syntax\n",
      "\n",
      "class BankAccount:\n",
      "\t\"\"\"A simple bank account class\"\"\"\n",
      "\t\n",
      "\tdef __init__(self, openingBalance):\t#special method to create objects\n",
      "        #with instances customized to a specific initial state\n",
      "\t\t\n",
      "        #since private instance variables don't exist in Python,\n",
      "        #hence using a convention: name prefixed with an underscore, to treat them as non-public part\n",
      "\t    self._balance = openingBalance\t#account balance\n",
      "\n",
      "\tdef deposit(self, amount):\t#makes deposit\n",
      "\t\tself._balance = self._balance + amount\n",
      "\n",
      "\tdef withdraw(self, amount):\t#makes withdrawl\n",
      "\t\tself._balance = self._balance - amount\n",
      "\n",
      "\tdef display(self):\t#displays balance\n",
      "\t\tprint 'Balance=', self._balance\n",
      "        \n",
      "#end class BankAccount\n",
      "\n",
      "ba1 = BankAccount(100.00)\t#create account\n",
      "\n",
      "print 'Before transactions, ',\n",
      "ba1.display()\t#display balance\n",
      "\n",
      "ba1.deposit(74.35)\t#make deposit\n",
      "ba1.withdraw(20.00)\t#make withdrawl\n",
      "\n",
      "print 'After transactions, ',\n",
      "ba1.display()\t#display balance\n",
      "#end"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Before transactions,  Balance= 100.0\n",
        "After transactions,  Balance= 154.35\n"
       ]
      }
     ],
     "prompt_number": 2
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 3: Page 25"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "#creating string objects\n",
      "str1 = ''\n",
      "str2 = 'George'\n",
      "\n",
      "#verifying results\n",
      "print str1\n",
      "print str2\n",
      "\n",
      "#naming string object\n",
      "str3 = 'amanuensis'\n",
      "\n",
      "#verifying results\n",
      "print str3\n",
      "\n",
      "#accessing specific characters from string using [] operator\n",
      "ch1 = str2[3]\n",
      "\n",
      "#verifying results\n",
      "print ch1\n",
      "\n",
      "#finding and printing number of characters in a string\n",
      "print len(str1)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "\n",
        "George\n",
        "amanuensis\n",
        "r\n",
        "0\n"
       ]
      }
     ],
     "prompt_number": 3
    }
   ],
   "metadata": {}
  }
 ]
}