{
 "metadata": {
  "name": "",
  "signature": "sha256:9d02541e3ea8d7af1efd977534b7150b993557acd6da8dc30b83dcacb798d681"
 },
 "nbformat": 3,
 "nbformat_minor": 0,
 "worksheets": [
  {
   "cells": [
    {
     "cell_type": "heading",
     "level": 1,
     "metadata": {},
     "source": [
      "Chapter 11 : File Input and Output"
     ]
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 11.1, Page No 250"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "try:\n",
      "    pRead = open(\"file1.dat\",\"r\")\n",
      "except IOError:\n",
      "    print \"\\nFile can not be opened\\n\"\n",
      "\n",
      "\"\"\"\n",
      "Input file:- file1.dat\n",
      "\"\"\""
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 3
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 11.2, Page No 252"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "try:\n",
      "    pRead = open(\"file1.dat\",\"r\")\n",
      "    if(not isinstance(pRead,file)):\n",
      "        print \"\\nFile can not be opened\\n\"\n",
      "    else:\n",
      "        print \"\\nFile opened for reading\\n\"\n",
      "    pRead.close()\n",
      "except IOError:\n",
      "    print \"\\nFile can not be opened\\n\"\n",
      "\n",
      "\"\"\"\n",
      "Input file:- file1.dat\n",
      "\"\"\""
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "\n",
        "File opened for reading\n",
        "\n"
       ]
      }
     ],
     "prompt_number": 2
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 11.3, Page No 253"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "try:\n",
      "    pRead = open(\"names.dat\",\"r\")\n",
      "    if(not isinstance(pRead,file)):\n",
      "        print \"\\nFile can not be opened\\n\"\n",
      "    else:\n",
      "        print \"\\nContents of names.dat\\n\"\n",
      "        while(1):\n",
      "            t = pRead.readline() \n",
      "            if(t != \"\"):\n",
      "                print t\n",
      "            else:\n",
      "                break\n",
      "    pRead.close()\n",
      "except IOError:\n",
      "    print \"\\nFile can not be opened\\n\"\n",
      "    \n",
      "\"\"\" \n",
      "Input File :- names.dat\n",
      "\n",
      "Michael\n",
      "Sheila\n",
      "Spencer\n",
      "Olivia\n",
      "\n",
      "\"\"\""
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "\n",
        "Contents of names.dat\n",
        "\n",
        "Michael\n",
        "\n",
        "Sheila\n",
        "\n",
        "Spencer\n",
        "\n",
        "Olivia\n"
       ]
      }
     ],
     "prompt_number": 3
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 11.4, Page No 255"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "try:\n",
      "    pRead = open(\"hobbies.dat\",\"r\")\n",
      "    if(not isinstance(pRead,file)):\n",
      "        print \"\\nFile can not be opened\\n\"\n",
      "    else:\n",
      "        print \"\\nName\\tHobby\\n\\n\"\n",
      "        while(1):\n",
      "            name = pRead.readline()\n",
      "            hobby = pRead.readline()\n",
      "            if(name != \"\"):\n",
      "                print name + \"\\t\"\n",
      "                print hobby\n",
      "            else:\n",
      "                break\n",
      "    pRead.close()\n",
      "except IOError:\n",
      "    print \"\\nFile can not be opened\\n\"\n",
      "    \n",
      "\"\"\"\n",
      "Input file :- hobbies.dat\n",
      "\n",
      "Michael\tProgramming\n",
      "Sheila\tShopping\n",
      "Spencer\tFootball\n",
      "Olivia\tDancing\n",
      "Waytt\tEating\n",
      "\"\"\""
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "\n",
        "Name\tHobby\n",
        "\n",
        "\n",
        "Michael\tProgramming\n",
        "\t\n",
        "Sheila\tShopping\n",
        "\n",
        "Spencer\tFootball\n",
        "\t\n",
        "Olivia\tDancing\n"
       ]
      }
     ],
     "prompt_number": 5
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 11.5, Page No 256"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "try:\n",
      "    pWrite = open(\"students.dat\",\"w\")\n",
      "    if(not isinstance(pWrite,file)):\n",
      "        print \"\\nFile can not be opened\\n\"\n",
      "    else:\n",
      "        fname = raw_input(\"Enter first name: \")\n",
      "        lname = raw_input(\"Enter last name: \")\n",
      "        id1 = raw_input(\"Enter id: \")\n",
      "        gpa = float(raw_input(\"Enter GPA: \"))\n",
      "        pWrite.writelines(fname + \" \" + lname + \"\\t\" + id1 + \"\\t\" + str(gpa))\n",
      "    pWrite.close()\n",
      "except IOError:\n",
      "    print \"\\nFile can not be opened\\n\"\n",
      "\n",
      "\"\"\"\n",
      "Output file:- students.dat\n",
      "Patric Star\t888-66-9999\t2.0\n",
      "\"\"\""
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "name": "stdout",
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Enter first name: Patric\n"
       ]
      },
      {
       "name": "stdout",
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Enter last name: Star\n"
       ]
      },
      {
       "name": "stdout",
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Enter id: 888-66-9999\n"
       ]
      },
      {
       "name": "stdout",
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Enter GPA: 2.00\n"
       ]
      }
     ],
     "prompt_number": 7
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 11.6, Page No 258"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "try:\n",
      "    pRead = open(\"students.dat\",\"r\")\n",
      "    if(not isinstance(pRead,file)):\n",
      "        print \"\\nFile can not be opened\\n\"\n",
      "    else:\n",
      "        print \"\\nName\\t\\tID\\t\\tGPA\\n\\n\"\n",
      "        while(1):\n",
      "            fname = pRead.read()\n",
      "            lname = pRead.read()\n",
      "            id1 = pRead.read()\n",
      "            gpa = pRead.read()\n",
      "            \n",
      "            if(fname != \"\"):\n",
      "                print fname + lname + \"\\t\\t\" + id1 + \"\\t\" + str(gpa)\n",
      "            else:\n",
      "                break\n",
      "    pRead.close()\n",
      "except IOError:\n",
      "    print \"\\nFile can not be opened\\n\"\n",
      "\n",
      "\"\"\"\n",
      "Input file:- students.dat\n",
      "Patric Star\t888-66-9999\t2.0\n",
      "\"\"\""
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "\n",
        "Name\t\tID\t\tGPA\n",
        "\n",
        "\n",
        "Patric Star\t888-66-9999\t2.0\t\t\t\n"
       ]
      }
     ],
     "prompt_number": 8
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 11.7, Page No 259"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "def readData():\n",
      "    try:\n",
      "        pRead = open(\"hobbies.dat\",\"r\")\n",
      "        if(not isinstance(pRead,file)):\n",
      "            print \"\\nFile can not be opened\\n\"\n",
      "        else:\n",
      "            print \"\\nName\\tHobby\\n\\n\"\n",
      "            while(1):\n",
      "                name = pRead.readline()\n",
      "                hobby = pRead.readline()\n",
      "                if(name != \"\"):\n",
      "                    print name + \"\\t\"\n",
      "                    print hobby\n",
      "                else:\n",
      "                    break\n",
      "        pRead.close()\n",
      "    except IOError:\n",
      "        print \"\\nFile can not be opened\\n\"\n",
      "try:\n",
      "    print \"Current file contains\"\n",
      "    readData()\n",
      "    print \"\\n\"\n",
      "    name = raw_input(\"Enter a new name: \")\n",
      "    hobby = raw_input(\"Enter a new hobby: \")\n",
      "    pWrite = open(\"hobbies.dat\",\"a\")\n",
      "    if(not isinstance(pWrite,file)):\n",
      "        print \"\\nFile can not be opened\\n\"\n",
      "    else:\n",
      "        pWrite.writelines(\"\\n\" + name + \"\\t\" + hobby)\n",
      "    pWrite.close()\n",
      "    readData()\n",
      "except IOError:\n",
      "    print \"\\nFile can not be opened\\n\"\n",
      "    \n",
      "\"\"\"\n",
      "Input file and Output file:- hobbies.dat\n",
      "Michael\tProgramming\n",
      "Sheila\tShopping\n",
      "Spencer\tFootball\n",
      "Olivia\tDancing\n",
      "Waytt\tEating\n",
      "\"\"\"\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Current file contains\n",
        "\n",
        "Name\tHobby\n",
        "\n",
        "\n",
        "Michael\tProgramming\n",
        "\t\n",
        "Sheila\tShopping\n",
        "\n",
        "Spencer\tFootball\n",
        "\t\n",
        "Olivia\tDancing\n",
        "\n",
        "\n"
       ]
      },
      {
       "name": "stdout",
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Enter a new name: Waytt\n"
       ]
      },
      {
       "name": "stdout",
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Enter a new hobby: Eating\n"
       ]
      },
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "\n",
        "Name\tHobby\n",
        "\n",
        "\n",
        "Michael\tProgramming\n",
        "\t\n",
        "Sheila\tShopping\n",
        "\n",
        "Spencer\tFootball\n",
        "\t\n",
        "Olivia\tDancing\n",
        "\n",
        "Waytt\tEating\t\n",
        "\n"
       ]
      }
     ],
     "prompt_number": 16
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 11.8, Page No 263"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "import sys\n",
      "try:\n",
      "    pRead = open(\"hobbies.dat\",\"r\")\n",
      "    if(not isinstance(pRead,file)):\n",
      "        print \"\\nFile can not be opened\\n\"\n",
      "        print \"The following error occurred\" #goto label\n",
      "        sys.exit(\"Some Error Occures\")\n",
      "    else:\n",
      "        print \"\\nName\\tHobby\\n\\n\"\n",
      "        while(1):\n",
      "            name = pRead.readline()\n",
      "            hobby = pRead.readline()\n",
      "            if(name != \"\"):\n",
      "                print name + \"\\t\"\n",
      "                print hobby\n",
      "            else:\n",
      "                break\n",
      "    pRead.close()\n",
      "    #sys.exit(\"Exit\")\n",
      "except IOError:\n",
      "    print \"\\nFile can not be opened\\n\"\n",
      "\n",
      "\"\"\"\n",
      "Input file:- hobbies.dat\n",
      "Michael\tProgramming\n",
      "Sheila\tShopping\n",
      "Spencer\tFootball\n",
      "Olivia\tDancing\n",
      "Waytt\tEating\n",
      "\"\"\""
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "\n",
        "Name\tHobby\n",
        "\n",
        "\n",
        "Michael\tProgramming\n",
        "\t\n",
        "Sheila\tShopping\n",
        "\n",
        "Spencer\tFootball\n",
        "\t\n",
        "Olivia\tDancing\n",
        "\n",
        "Waytt\tEating\t\n",
        "\n"
       ]
      }
     ],
     "prompt_number": 20
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 11.9, Page No 266"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "print \"\\n\\tPhone Book\\n\"\n",
      "print \"\\n 1 \\t Add phone book entry \\n\"\n",
      "print \"2 \\t Print phone book \\n\\n\"\n",
      "print \"Select an option: \"\n",
      "response = int(raw_input(\"Select an option: \"))\n",
      "print response\n",
      "if(response == 1):\n",
      "    fname = raw_input(\"Enter first name: \")\n",
      "    lname = raw_input(\"Enter last name: \")\n",
      "    number = raw_input(\"Enter phone number: \")\n",
      "    pWrite = open(\"phone_book.dat\",\"a\")\n",
      "    if(isinstance(pWrite,file)):\n",
      "       pWrite.writelines(fname + \" \" + lname + \" \" + number + \"\\n\")\n",
      "       pWrite.close()\n",
      "    else:\n",
      "        print \"The error occured\" #go to\n",
      "elif(response == 2):\n",
      "    pRead = open(\"phone_book.dat\",\"r\")\n",
      "    if(isinstance(pRead,file)):\n",
      "        while(1):\n",
      "            fname = pRead.read()\n",
      "            if(fname == \"\"):\n",
      "                break\n",
      "            lname = pRead.read()\n",
      "            number = pRead.read()\n",
      "            print fname\n",
      "            print lname\n",
      "            print number\n",
      "        print \"\\n\"\n",
      "    else:\n",
      "        print \"The error occured\" #go to\n",
      "else:\n",
      "    print \"Invalid Selection\"\n",
      "\n",
      "\"\"\"\n",
      "Input file and Output file:- phone_book.dat\n",
      "John Smith 538.676.1234\n",
      "\"\"\""
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "\n",
        "\tPhone Book\n",
        "\n",
        "\n",
        " 1 \t Add phone book entry \n",
        "\n",
        "2 \t Print phone book \n",
        "\n",
        "\n",
        "Select an option: \n"
       ]
      },
      {
       "name": "stdout",
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Select an option: 2\n"
       ]
      },
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "2\n",
        "John Smith 538.676.1234\n",
        "\n",
        "\n",
        "\n",
        "\n",
        "\n"
       ]
      }
     ],
     "prompt_number": 1
    }
   ],
   "metadata": {}
  }
 ]
}