{
 "metadata": {
  "name": "",
  "signature": "sha256:3748f84e3bd0279efe47855bd2c4e23912ef725121f3591980fa33e19d6ccae4"
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 "worksheets": [
  {
   "cells": [
    {
     "cell_type": "heading",
     "level": 1,
     "metadata": {},
     "source": [
      "Chapter 14, Input/Output and Files"
     ]
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Program 14-5, Page Number: 424"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "# Files : Opening and Closing\n",
      "\n",
      "# Open the file for writing\n",
      "\n",
      "file_pointer = open(\"first_file\",\"w\")\n",
      "\n",
      "print \"Enter text:\"\n",
      "\n",
      "# Get characters and place them in the file\n",
      "\n",
      "text = \"BASIC is easy,\\nFORTAN is fun,\\nPascal may be structured,\\nBut C's the one!\"\n",
      "print text\n",
      "file_pointer.write(text)\n",
      "\n",
      "file_pointer.close()\n",
      "\n",
      "file_pointer = open(\"first_file\",\"r\")\n",
      "\n",
      "#Display the text from file\n",
      "\n",
      "print \"\\nYou entered:\"\n",
      "print file_pointer.read()\n",
      "\n",
      "file_pointer.close()"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Enter text:\n",
        "BASIC is easy,\n",
        "FORTAN is fun,\n",
        "Pascal may be structured,\n",
        "But C's the one!\n",
        "\n",
        "You entered:\n",
        "BASIC is easy,\n",
        "FORTAN is fun,\n",
        "Pascal may be structured,\n",
        "But C's the one!\n"
       ]
      }
     ],
     "prompt_number": 1
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Program 14-6, Page Number: 426"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "# Using several files\n",
      "\n",
      "# Open the source file for reading\n",
      "\n",
      "first_file_pointer = open(\"first_file\",\"r\")\n",
      "\n",
      "# Open the destination file for writing\n",
      "\n",
      "second_file_pointer = open(\"second_file\",\"w\")\n",
      "\n",
      "# Transfer characters from source to destination file\n",
      "\n",
      "c = first_file_pointer.read()\n",
      "second_file_pointer.write(c)\n",
      "\n",
      "# Close both files\n",
      "\n",
      "first_file_pointer.close()\n",
      "second_file_pointer.close()\n",
      "\n",
      "# Open second file for displaying contentes\n",
      "\n",
      "second_file_pointer = open(\"second_file\",\"r\")\n",
      "print(\"'second_file' contains:\")\n",
      "print second_file_pointer.read()"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "'second_file' contains:\n",
        "BASIC is easy,\n",
        "FORTAN is fun,\n",
        "Pascal may be structured,\n",
        "But C's the one!\n"
       ]
      }
     ],
     "prompt_number": 2
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Program 14-7, Page Number : 428"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "# Append mode\n",
      "\n",
      "# Open the first file for writing\n",
      "\n",
      "first_file_pointer = open(\"first_file\",\"w\")\n",
      "\n",
      "# Open the second file for appending\n",
      "\n",
      "second_file_pointer = open(\"second_file\",\"a\")\n",
      "\n",
      "# Writing to both files\n",
      "\n",
      "first_file_pointer.write(\"\\n--Anonymous\\n\")\n",
      "second_file_pointer.write(\"\\n--Anonymous\\n\")\n",
      "\n",
      "# Close both files\n",
      "\n",
      "first_file_pointer.close()\n",
      "second_file_pointer.close()\n",
      "\n",
      "# Display the contents of first file\n",
      "first_file_pointer = open(\"first_file\",\"r\")\n",
      "print(\"After write, 'first_file contains:\")\n",
      "print first_file_pointer.read()\n",
      "\n",
      "# Display the contents of second file\n",
      "second_file_pointer = open(\"second_file\",\"r\")\n",
      "print(\"After append, 'second_file' contains:\")\n",
      "print second_file_pointer.read()"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "After write, 'first_file contains:\n",
        "\n",
        "--Anonymous\n",
        "\n",
        "After append, 'second_file' contains:\n",
        "BASIC is easy,\n",
        "FORTAN is fun,\n",
        "Pascal may be structured,\n",
        "But C's the one!\n",
        "--Anonymous\n",
        "\n"
       ]
      }
     ],
     "prompt_number": 3
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Program 14-8, Page Number: 431"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "# The seek function\n",
      "\n",
      "# Open file for reading\n",
      "try :\n",
      "\tfile_pointer = open(\"second_file\",\"r\")\n",
      "except :\n",
      "\tprint \"'second_file' cannot be opened\"\n",
      "\texit ()\n",
      "\n",
      "# Skip the first 6 characters\n",
      "\n",
      "file_pointer.seek(6,0)\n",
      "print file_pointer.read()"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "is easy,\n",
        "FORTAN is fun,\n",
        "Pascal may be structured,\n",
        "But C's the one!\n",
        "--Anonymous\n",
        "\n"
       ]
      }
     ],
     "prompt_number": 4
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Program 14-9, Page Number: 433"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "# The 'w+' mode and seek to rewind a file\n",
      "\n",
      "# Open a file for read/write\n",
      "file_pointer = open(\"first_file\",\"w+\")\n",
      "\n",
      "print \"Enter text:\"\n",
      "text = \"BASIC is easy,\\nFORTAN is fun,\\nPascal may be structured,\\nBut C's the one!\"\n",
      "print text\n",
      "file_pointer.write(text)\n",
      "\n",
      "file_pointer.seek(0,0)\n",
      "\n",
      "# Display the file\n",
      "print \"\\nYou entered:\"\n",
      "print file_pointer.read()"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Enter text:\n",
        "BASIC is easy,\n",
        "FORTAN is fun,\n",
        "Pascal may be structured,\n",
        "But C's the one!\n",
        "\n",
        "You entered:\n",
        "BASIC is easy,\n",
        "FORTAN is fun,\n",
        "Pascal may be structured,\n",
        "But C's the one!\n"
       ]
      }
     ],
     "prompt_number": 5
    }
   ],
   "metadata": {}
  }
 ]
}