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diff --git a/Programming_in_C_using_ANSI_C/KamthaneChapter14.ipynb b/Programming_in_C_using_ANSI_C/KamthaneChapter14.ipynb new file mode 100755 index 00000000..409585bd --- /dev/null +++ b/Programming_in_C_using_ANSI_C/KamthaneChapter14.ipynb @@ -0,0 +1,2311 @@ +{
+ "metadata": {
+ "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h1>Chapter 14: Files<h1>"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.1, Page number: 454<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Write data to text file and read it\n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Open file\n",
+ "fp = open('C:\\Users\\Aathira\\Documents\\IPython Notebooks\\data.txt','a')\n",
+ "\n",
+ "#Write data to file if successfully created the file\n",
+ "if fp == 0:\n",
+ " sys.stdout.write(\"Cannot open file\")\n",
+ "else:\n",
+ " sys.stdout.write(\"Write data & to stop press '.'\")\n",
+ " c = ''\n",
+ " while c != '.':\n",
+ " c = raw_input(\"Write data & to stop press '.'\")\n",
+ " fp.write(c)\n",
+ " fp.close()\n",
+ "\n",
+ " #Read and display the contents of file\n",
+ " sys.stdout.write(\"\\nContents read : \")\n",
+ " fp = open('C:\\Users\\Aathira\\Documents\\IPython Notebooks\\data.txt','r')\n",
+ " f = fp.readlines()\n",
+ " for f1 in f:\n",
+ " print f1\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Write data & to stop press '.'"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Write data & to stop press '.'ABCDEFGHIJK\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Write data & to stop press '.'.\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "Contents read : ABCDEFGHIJK.\n"
+ ]
+ }
+ ],
+ "prompt_number": 2
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.2, Page number: 455<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Display the contents of the file before and after appending.\n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Open file for read data\n",
+ "fp = open('C:\\Users\\Aathira\\Documents\\IPython Notebooks\\data.txt','r')\n",
+ "\n",
+ "#Read and display the contents of file\n",
+ "sys.stdout.write(\"\\nContents of file before appending :\\n\")\n",
+ "fp = open('C:\\Users\\Aathira\\Documents\\IPython Notebooks\\data.txt','r')\n",
+ "f = fp.readlines()\n",
+ "for f1 in f:\n",
+ " print f1\n",
+ "\n",
+ "#Open file for appending\n",
+ "fp = open('C:\\Users\\Aathira\\Documents\\IPython Notebooks\\data.txt','a')\n",
+ "\n",
+ "if f == 0:\n",
+ " sys.stdout.write(\"File can not appended\")\n",
+ "else:\n",
+ " c = ''\n",
+ " #fp.write('\\n')\n",
+ " while c != '.':\n",
+ " c = raw_input(\"Enter string to append\")\n",
+ " fp.write(c)\n",
+ " \n",
+ " fp.close()\n",
+ " \n",
+ " #Read and display the contents of file\n",
+ " sys.stdout.write(\"\\nContents of file After appending\\n\")\n",
+ " fp = open('C:\\Users\\Aathira\\Documents\\IPython Notebooks\\data.txt','r')\n",
+ " f = fp.readlines()\n",
+ " for f1 in f:\n",
+ " print f1\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "Contents of file before appending :\n",
+ "String is terminated with '\\0'.\n",
+ "\n",
+ "Contents of file After appending\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "String is terminated with '\\0'.This character is called as NULL character.\n"
+ ]
+ }
+ ],
+ "prompt_number": 16
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.3, Page number: 457<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Writing and reading of a file.\n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Open file\n",
+ "fp = open('C:\\Users\\Aathira\\Documents\\IPython Notebooks\\data.txt','w+')\n",
+ "\n",
+ "#Write data to file if successfully created the file\n",
+ "if fp == 0:\n",
+ " sys.stdout.write(\"Cannot open file\")\n",
+ "else:\n",
+ " sys.stdout.write(\"Write data & to stop press '.'\")\n",
+ " c = ''\n",
+ " while c != '.':\n",
+ " c = raw_input(\"Write data & to stop press '.'\")\n",
+ " fp.write(c)\n",
+ " fp.close()\n",
+ "\n",
+ " #Read and display the contents of file\n",
+ " sys.stdout.write(\"\\nContents read : \")\n",
+ " fp = open('C:\\Users\\Aathira\\Documents\\IPython Notebooks\\data.txt','r')\n",
+ " f = fp.readlines()\n",
+ " for f1 in f:\n",
+ " print f1\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Write data & to stop press '.'\n",
+ "Contents read : "
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "ABCDEFGHIJK.\n"
+ ]
+ }
+ ],
+ "prompt_number": 5
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.4, Page number: 458<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Open a file in append mode and add new records in it.\n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Open file\n",
+ "fp = open('C:\\Users\\Aathira\\Documents\\IPython Notebooks\\data.txt','a+')\n",
+ "\n",
+ "#Write data to file if successfully created the file\n",
+ "if fp == 0:\n",
+ " sys.stdout.write(\"Cannot open file\")\n",
+ "else:\n",
+ " sys.stdout.write(\"Write data & to stop press '.'\")\n",
+ " c = ''\n",
+ " while c != '.':\n",
+ " c = raw_input(\"Write data & to stop press '.'\")\n",
+ " fp.write(c)\n",
+ " fp.close()\n",
+ "\n",
+ " #Read and display the contents of file\n",
+ " sys.stdout.write(\"\\nContents read : \")\n",
+ " fp = open('C:\\Users\\Aathira\\Documents\\IPython Notebooks\\data.txt','a+')\n",
+ " f = fp.readlines()\n",
+ " for f1 in f:\n",
+ " print f1\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Write data & to stop press '.'\n",
+ "Contents read : "
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "This is append and read mode.\n"
+ ]
+ }
+ ],
+ "prompt_number": 2
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.5, Page number: 459<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Open a file in read/write mode in it\n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Open file\n",
+ "fp = open('C:\\Users\\Aathira\\Documents\\IPython Notebooks\\data.txt','r+')\n",
+ "\n",
+ "#Write data to file if successfully created the file\n",
+ "if fp == 0:\n",
+ " sys.stdout.write(\"Cannot open file\")\n",
+ "else:\n",
+ " #Read and display the contents of file\n",
+ " sys.stdout.write(\"\\nContents read : \")\n",
+ " f = fp.readlines()\n",
+ " for f1 in f:\n",
+ " print f1\n",
+ " \n",
+ " sys.stdout.write(\"Write data & to stop press '.'\")\n",
+ " c = ''\n",
+ " while c != '.':\n",
+ " c = raw_input(\"Write data & to stop press '.'\")\n",
+ " fp.write(c)\n",
+ " fp.close()\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "Contents read : Help me.\n",
+ "Write data & to stop press '.'"
+ ]
+ }
+ ],
+ "prompt_number": 2
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.6, Page number: 460<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Open a file for read/write operation in binary mode\n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Open file\n",
+ "fp = open('C:\\Users\\Aathira\\Documents\\IPython Notebooks\\data.txt','wb')\n",
+ "\n",
+ "#Write data to file if successfully created the file\n",
+ "if fp == 0:\n",
+ " sys.stdout.write(\"Cannot open file\")\n",
+ "else:\n",
+ " sys.stdout.write(\"Write data & to stop press '.'\")\n",
+ " c = ''\n",
+ " while c != '.':\n",
+ " c = raw_input(\"Write data & to stop press '.'\")\n",
+ " fp.write(c)\n",
+ " fp.close()\n",
+ "\n",
+ " #Read and display the contents of file\n",
+ " sys.stdout.write(\"\\nContents read : \")\n",
+ " fp = open('C:\\Users\\Aathira\\Documents\\IPython Notebooks\\data.txt','rb')\n",
+ " f = fp.readlines()\n",
+ " for f1 in f:\n",
+ " print f1\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Write data & to stop press '.'\n",
+ "Contents read : "
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "ABCDEFGHIJK.\n"
+ ]
+ }
+ ],
+ "prompt_number": 3
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.7, Page number: 462<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Open a text file and write some text \n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Open file\n",
+ "fp = open('C:\\Users\\Aathira\\Documents\\IPython Notebooks\\data.txt','w')\n",
+ "\n",
+ "#Read the string\n",
+ "text = raw_input(\"Enter Text Here : \")\n",
+ "\n",
+ "#Write to the file\n",
+ "#fp.write() is the equivalent function for fprintf() in python\n",
+ "fp.write(\"%s\"%(text))\n",
+ "\n",
+ "#To see the result, open the data.txt file"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [],
+ "prompt_number": 4
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.8, Page number: 463<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Enter data into the text file and read the same. \n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Open file\n",
+ "fp = open('C:\\Users\\Aathira\\Documents\\IPython Notebooks\\data.txt','w')\n",
+ "\n",
+ "#Read the data\n",
+ "text = raw_input(\"Name & Age\")\n",
+ "age = int(raw_input(\"Name & Age\"))\n",
+ "\n",
+ "#Write to file\n",
+ "fp.write(\"%s %d\"%(text,age))\n",
+ "\n",
+ "fp = open('C:\\Users\\Aathira\\Documents\\IPython Notebooks\\data.txt','r')\n",
+ "#Result\n",
+ "sys.stdout.write(\"Name\\tAge\\n\")\n",
+ "text = fp.read()\n",
+ "age = fp.read()\n",
+ "sys.stdout.write(\"%s\\t%s\\n\"%(text,age))\n",
+ "fp.close()"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Name\tAge\n",
+ "AMIT 12\t\n"
+ ]
+ }
+ ],
+ "prompt_number": 15
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.9, Page number: 463<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Read the contents of the file \n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Open file\n",
+ "f = open('C:\\Users\\Aathira\\Documents\\IPython Notebooks\\list.txt','r')\n",
+ "\n",
+ "if f == 0:\n",
+ " sys.stdout.write(\"Cannot open file\")\n",
+ "else:\n",
+ " for c in f:\n",
+ " sys.stdout.write(\"%s\"%(c))\n",
+ " #Python gives iterative statements there is no getc() fucntion"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "aman\n",
+ "akash\n",
+ "amit\n",
+ "ajay\n",
+ "ankit"
+ ]
+ }
+ ],
+ "prompt_number": 1
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.10, Page number: 464<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Write some text into the file \n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Open file\n",
+ "fp = open('C:\\Users\\Aathira\\Documents\\IPython Notebooks\\words.doc','w')\n",
+ "\n",
+ "#Write data to file\n",
+ "c = ''\n",
+ "while c != '*':\n",
+ " c = raw_input(\"Enter Few Words '*' to Exit\")\n",
+ " fp.write(c)\n",
+ "\n",
+ "fp.close()\n",
+ " #There is no putc() function in python\n",
+ " #Open the file to see the result"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [],
+ "prompt_number": 3
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.11, Page number: 465<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Count\n",
+ "\n",
+ "# Total number of statements\n",
+ "# Total number of included files\n",
+ "# Total number of blocks and brackets\n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Open file\n",
+ "fs = open('C:\\Users\\Aathira\\Documents\\IPython Notebooks\\PRG2.C','r')\n",
+ "\n",
+ "#variable initialization\n",
+ "i = 0\n",
+ "c = 0\n",
+ "sb = 0\n",
+ "b = 0\n",
+ "\n",
+ "if fs == 0:\n",
+ " sys.stdout.write(\"File opening error\")\n",
+ "else:\n",
+ " for line in fs:\n",
+ " k = 0\n",
+ " while k < len(line):\n",
+ " if line[k] == ';':\n",
+ " c += 1\n",
+ " else:\n",
+ " if line[k] == '{':\n",
+ " sb += 1\n",
+ " else:\n",
+ " if line[k] == '(':\n",
+ " b += 1\n",
+ " else:\n",
+ " if line[k] == '#':\n",
+ " i += 1\n",
+ " k += 1\n",
+ " \n",
+ " #Result\n",
+ " sys.stdout.write(\"\\nSummary of 'C' Program\\n\")\n",
+ " sys.stdout.write(\"===========================\")\n",
+ " sys.stdout.write(\"\\nTotal Statments : %d\"%(c+i))\n",
+ " sys.stdout.write(\"\\nInclude Statements : %d\"%(i))\n",
+ " sys.stdout.write(\"\\nTotal Blocks {} : %d\"%(sb))\n",
+ " sys.stdout.write(\"\\nTotal Brackets () : %d\"%(b))\n",
+ " sys.stdout.write(\"\\n============================\")\n",
+ " "
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "Summary of 'C' Program\n",
+ "===========================\n",
+ "Total Statments : 8\n",
+ "Include Statements : 2\n",
+ "Total Blocks {} : 2\n",
+ "Total Brackets () : 9\n",
+ "============================"
+ ]
+ }
+ ],
+ "prompt_number": 8
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.12, Page number: 466<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Write text to a file \n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Open file\n",
+ "fp = open('C:\\Users\\Aathira\\Documents\\IPython Notebooks\\lines.txt','w')\n",
+ "\n",
+ "if fp == 0:\n",
+ " sys.stdout.write(\"\")\n",
+ "else:\n",
+ " #Write data to file\n",
+ " c = ''\n",
+ " while c != '*':\n",
+ " c = raw_input(\"\")\n",
+ " fp.write(c)\n",
+ " fp.close()\n",
+ " #There is no fputc() function in python\n",
+ " #Open the file to see the result"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [],
+ "prompt_number": 10
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.13, Page number: 467<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Read text from the given file \n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Open file\n",
+ "\n",
+ "file1 = raw_input(\"Enter File Name : \")\n",
+ "fp = open(file1,'r')\n",
+ "\n",
+ "if fp == 0:\n",
+ " sys.stdout.write(\"File not found\\n\")\n",
+ "else:\n",
+ " for text in fp:\n",
+ " print text\n",
+ " #File pointer itself is iterable in python"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "#include <stdio.h>\n"
+ ]
+ }
+ ],
+ "prompt_number": 11
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.14, Page number: 468<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Write a string into a file \n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Open file\n",
+ "\n",
+ "file1 = raw_input(\"Enter the name of file : \")\n",
+ "fp = open(file1,'w')\n",
+ "\n",
+ "if fp == 0:\n",
+ " sys.stdout.write(\"File can not opened\\n\")\n",
+ "else:\n",
+ " text = raw_input(\"Enter Text Here : \")\n",
+ " fp.write(text)\n",
+ " \n",
+ " #Write() function is used to write character or string into the file in python\n",
+ " # there is no fputc() function in python\n",
+ "#open the file to see the result"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [],
+ "prompt_number": 13
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.15, Page number: 469<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Write integers in a file \n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Open file\n",
+ "fp = open('num.txt','w')\n",
+ "\n",
+ "if fp == 0:\n",
+ " sys.stdout.write(\"File does not exist\\n\")\n",
+ "else:\n",
+ " v = ' '\n",
+ " while v != '0':\n",
+ " fp.write(v)\n",
+ " v = raw_input(\"Enter Numbers\")\n",
+ " \n",
+ " #open the file to see the result"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [],
+ "prompt_number": 3
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.16, Page number: 470<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Read integers from the file \n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Open file\n",
+ "fp = open('num.txt','r')\n",
+ "\n",
+ "if fp == 0:\n",
+ " sys.stdout.write(\"File does not exist\\n\")\n",
+ "else:\n",
+ " for v in fp:\n",
+ " print v"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "1 2 3 4 5\n"
+ ]
+ }
+ ],
+ "prompt_number": 1
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.17, Page number: 471<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Write a block of structure elements to the given file \n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Class declaration\n",
+ "class student:\n",
+ " name = ''\n",
+ " age = 0\n",
+ " \n",
+ "#Class variable declaration\n",
+ "stud = [student() for i in range(0,5)]\n",
+ "\n",
+ "#Open file\n",
+ "file1 = raw_input(\"Enter the file name : \")\n",
+ "fp = open(file1,'w')\n",
+ "\n",
+ "if fp == 0:\n",
+ " sys.stdout.write(\"File does not exist\\n\")\n",
+ "else:\n",
+ " n = int(raw_input(\"How Many Records : \"))\n",
+ " for i in range(0,n):\n",
+ " stud[i].name = raw_input(\"Name : \")\n",
+ " stud[i].age = int(raw_input(\"Age : \"))\n",
+ " \n",
+ " j = 0\n",
+ " while j < n:\n",
+ " fp.write(\"%s %d\\n\"%(stud[j].name,stud[j].age))\n",
+ " j += 1\n",
+ " \n",
+ " fp.close()\n",
+ " \n",
+ " #open the file to see the result"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [],
+ "prompt_number": 3
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.18, Page number: 472<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Write and read the information about the player \n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Class declaration\n",
+ "class record:\n",
+ " player = ''\n",
+ " age = 0\n",
+ " runs = 0\n",
+ " \n",
+ "#Class variable declaration\n",
+ "emp = record()\n",
+ "\n",
+ "#Open file\n",
+ "fp = open('record.dat','w')\n",
+ "\n",
+ "if fp == 0:\n",
+ " sys.stdout.write(\"Can not open the file\\n\")\n",
+ "else:\n",
+ " emp.player = raw_input(\"Enter Player Name\")\n",
+ " emp.age = int(raw_input(\"Enter Age\"))\n",
+ " emp.runs = int(raw_input(\"Enter runs scored\"))\n",
+ " fp.write(\"%s %d %d\"%(emp.player,emp.age,emp.runs))\n",
+ " fp.close()\n",
+ " \n",
+ " fp = open('record.dat','r')\n",
+ " if fp == 0:\n",
+ " sys.stdout.write(\"Error in opening file\")\n",
+ " else:\n",
+ " sys.stdout.write(\"\\nRecord Entered is\\n\")\n",
+ " emp.player,emp.age,emp.runs = fp.read().split(' ')\n",
+ " sys.stdout.write(\"\\n%s %s %s\"%(emp.player,emp.age,emp.runs))\n",
+ " fp.close()"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter Player NameSachin\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter Age25\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter runs scored10000\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "Record Entered is\n",
+ "\n",
+ "Sachin 25 10000"
+ ]
+ }
+ ],
+ "prompt_number": 3
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.19, Page number: 473<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Write a block of structure elements to the given file \n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Variable Initialization\n",
+ "next1 = 'Y'\n",
+ "\n",
+ "#Class declaration\n",
+ "class bike:\n",
+ " name = ''\n",
+ " avg = 0\n",
+ " cost = 0.0\n",
+ " \n",
+ "#Class variable declaration\n",
+ "e = bike()\n",
+ "\n",
+ "#open file\n",
+ "fp = open('bk.txt','wb')\n",
+ "\n",
+ "if fp == 0:\n",
+ " sys.stdout.write(\"Cannot open file\")\n",
+ "else:\n",
+ " while next1 == 'Y':\n",
+ " e.name = raw_input(\"Model Name\")\n",
+ " e.avg = int(raw_input(\"Average\"))\n",
+ " e.cost = float(raw_input(\"Price\"))\n",
+ " fp.write(\"%s %d %f\\n\"%(e.name,e.avg,e.cost))\n",
+ " \n",
+ " next1 = raw_input(\"Add Another (Y/N):\")\n",
+ " fp.close()"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Model NameHONDA\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Average80\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Price45000\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Add Another (Y/N):Y\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Model NameSUZUKI\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Average65\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Price43000\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Add Another (Y/N):Y\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Model NameYAMAHA\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Average55\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Price48000\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Add Another (Y/N):N\n"
+ ]
+ }
+ ],
+ "prompt_number": 5
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.20, Page number: 474<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Read the information about the bike \n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Class declaration\n",
+ "class bike:\n",
+ " name = ''\n",
+ " avg = 0\n",
+ " cost = 0.0\n",
+ " \n",
+ "#Class variable declaration\n",
+ "e = bike()\n",
+ "\n",
+ "#open file\n",
+ "fp = open('bk.txt','rb')\n",
+ "\n",
+ "if fp == 0:\n",
+ " sys.stdout.write(\"Cannot open file\")\n",
+ "else:\n",
+ " lines = fp.readlines()\n",
+ " for line in lines:\n",
+ " e.name,e.avg,e.cost = line.split(' ')\n",
+ " e.avg = int(e.avg)\n",
+ " e.cost = float(e.cost)\n",
+ " sys.stdout.write(\"\\n%s %d %.2f\"%(e.name,e.avg,e.cost))"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "HONDA 80 45000.00\n",
+ "SUZUKI 65 43000.00\n",
+ "YAMAHA 55 48000.00"
+ ]
+ }
+ ],
+ "prompt_number": 1
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.21, Page number: 476<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Read the text after skipping n characters from beginning of the file\n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Open file\n",
+ "fp = open(\"text.txt\",\"r\")\n",
+ "\n",
+ "sys.stdout.write(\"\\nContents of file\\n\")\n",
+ "ch = fp.read()\n",
+ "sys.stdout.write(\"%s\"%(ch))\n",
+ "\n",
+ "#Read n\n",
+ "n = int(raw_input(\"How many characters including spaces would you like to skip?\"))\n",
+ "\n",
+ "#Result\n",
+ "sys.stdout.write(\"\\nInformation after %d bytes\\n\"%(n))\n",
+ "\n",
+ "ch = ch[n:]\n",
+ "sys.stdout.write(\"%s\"%(ch))\n",
+ "\n",
+ "fp.close()"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "Contents of file\n",
+ "THE C PROGRAMMING LANGUAGE INVENTED BY DENNIS RITCHIE"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "How many characters including spaces would you like to skip?18\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "Information after 18 bytes\n",
+ "LANGUAGE INVENTED BY DENNIS RITCHIE"
+ ]
+ }
+ ],
+ "prompt_number": 7
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.22, Page number: 477<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Read last few characters of the file \n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Open file\n",
+ "fp = open(\"text.txt\",\"r\")\n",
+ "\n",
+ "sys.stdout.write(\"\\nContents of file\\n\")\n",
+ "ch = fp.read()\n",
+ "sys.stdout.write(\"%s\"%(ch))\n",
+ "\n",
+ "#Read n\n",
+ "n = int(raw_input(\"How many characters including spaces would you like to skip?\"))\n",
+ "\n",
+ "#Result\n",
+ "sys.stdout.write(\"\\nInformation after %d bytes\\n\"%(n))\n",
+ "\n",
+ "print ch[-n:]\n",
+ "\n",
+ "fp.close()"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "Contents of file\n",
+ "HELLO WORLD"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "How many characters including spaces would you like to skip?5\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "Information after 5 bytes\n",
+ "WORLD\n"
+ ]
+ }
+ ],
+ "prompt_number": 9
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.23, Page number: 477<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Display 'c' program files in current directory. \n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Variable initialization\n",
+ "l = 0\n",
+ "c = 0\n",
+ "\n",
+ "#Open file\n",
+ "file1 = raw_input(\"Enter the file name : \")\n",
+ "fp = open(file1,'r')\n",
+ "\n",
+ "#Result\n",
+ "sys.stdout.write(\"\\nContents of 'c' program file in capital case\")\n",
+ "sys.stdout.write(\"\\n============================================\\n\")\n",
+ "\n",
+ "ch = fp.readlines()\n",
+ "\n",
+ "for line in ch:\n",
+ " i = 0\n",
+ " #print line.upper()\n",
+ " while i < len(line):\n",
+ " if line[i] =='\\n':\n",
+ " l += 1\n",
+ " else:\n",
+ " c += 1\n",
+ " sys.stdout.write(\"%c\"%(line[i].upper()))\n",
+ " i += 1\n",
+ "\n",
+ "sys.stdout.write(\"\\nTotal Characters : %d\"%(c))\n",
+ "sys.stdout.write(\"\\nTotal Lines : %d\"%(l))"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "Contents of 'c' program file in capital case\n",
+ "============================================\n",
+ "MAIN()\n",
+ "{\n",
+ "PRINTF(\" HELLO WORLD\");\n",
+ "}\n",
+ "\n",
+ "Total Characters : 31\n",
+ "Total Lines : 4"
+ ]
+ }
+ ],
+ "prompt_number": 20
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.24, Page number: 479<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Detect the end of file \n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Open file\n",
+ "fp = open(\"text.txt\",\"r\")\n",
+ "\n",
+ "#there is no feof() function in python\n",
+ "c = fp.tell()\n",
+ "sys.stdout.write(\"File pointer at the beginning of the file : %d\\n\"%(c))\n",
+ "\n",
+ "c = fp.read()\n",
+ "sys.stdout.write(\"%s\"%(c))\n",
+ "\n",
+ "c = fp.tell()\n",
+ "sys.stdout.write(\"\\nFile pointer at the end of file : %d\"%(c))"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "File pointer at the beginning of the file : 0\n",
+ "TECHNOCRATS LEAD THE WORLD \n",
+ "File pointer at the end of file : 32"
+ ]
+ }
+ ],
+ "prompt_number": 26
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.25, Page number: 480<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Detect an error while read/write operation of a file is in use.\n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Variable initialization\n",
+ "next1 = 'Y'\n",
+ "\n",
+ "#open file\n",
+ "fp = open('marks.dat','r')\n",
+ "\n",
+ "if fp == 0:\n",
+ " sys.stdout.write(\"Can not open file\")\n",
+ "else:\n",
+ " while next1 == 'Y':\n",
+ " name = raw_input(\"Enter Name, Marks, Percentage\")\n",
+ " marks = int(raw_input(\"Enter Name, Marks, Percentage\"))\n",
+ " \n",
+ " p = marks/7\n",
+ " try:\n",
+ " fp.write(\"%s %d %f\"%(name,marks,p))\n",
+ " except:\n",
+ " sys.stdout.write(\"\\nUnable to write data?\")\n",
+ " sys.stdout.write(\"\\nFile opening mode is incorrect.\")\n",
+ " fp.close()\n",
+ " \n",
+ " next1 = raw_input(\"Continue Y/N:\")"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter Name, Marks, PercentageKAMAL\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter Name, Marks, Percentage540\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "Unable to write data?\n",
+ "File opening mode is incorrect."
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Continue Y/N:N\n"
+ ]
+ }
+ ],
+ "prompt_number": 10
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.26, Page number: 481<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Catch the error that is occurred while file operation\n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Open file\n",
+ "f = open(\"io8.c\",\"w\")\n",
+ "\n",
+ "if f == 0:\n",
+ " sys.stdout.write(\"\\nCannot open file\")\n",
+ "else:\n",
+ " #Exception handling\n",
+ " try:\n",
+ " c = fp.readlines()\n",
+ " sys.stdout.write(\"%s\"%(c))\n",
+ " except:\n",
+ " sys.stdout.write(\"\\nCan't read file.\")\n",
+ "#There is no ferror() function python."
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "Can't read file."
+ ]
+ }
+ ],
+ "prompt_number": 1
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.27, Page number: 482<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Detect and print the error message\n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Variable Initialization\n",
+ "file1 = \"lines.txt\"\n",
+ "\n",
+ "#Open file\n",
+ "fr = open(file1,\"w\")\n",
+ "\n",
+ "sys.stdout.write(\"%s : \"%(file1))\n",
+ "#Exception handling\n",
+ "try:\n",
+ " c = fp.readlines()\n",
+ "except:\n",
+ " sys.stdout.write(\"Permission Denied\")\n",
+ " "
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "lines.txt : Permission Denied"
+ ]
+ }
+ ],
+ "prompt_number": 1
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.28, Page number: 482<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Print the current position of the file pointer \n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Open file\n",
+ "fp = open(\"text.txt\",\"r\")\n",
+ "\n",
+ "#Set the pointer\n",
+ "fp.seek(21)\n",
+ "\n",
+ "#Result\n",
+ "while True:\n",
+ " c = fp.read(1)\n",
+ " if not c:\n",
+ " break\n",
+ " sys.stdout.write(\"%c\\t%d\\n\"%(c,fp.tell()))\n",
+ "#There is no endof file in python"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "W\t22\n",
+ "O\t23\n",
+ "R\t24\n",
+ "L\t25\n",
+ "D\t26\n"
+ ]
+ }
+ ],
+ "prompt_number": 12
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.29, Page number: 483<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Detect beginning of file\n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#open file\n",
+ "fp = open(\"text.txt\",\"r\")\n",
+ "\n",
+ "fp.seek(12)\n",
+ "sys.stdout.write(\"Pointer is at %d\\n\"%(fp.tell()))\n",
+ "sys.stdout.write(\"Before rewind() : \")\n",
+ "\n",
+ "#Result\n",
+ "while True:\n",
+ " c = fp.read(1)\n",
+ " if not c:\n",
+ " break\n",
+ " sys.stdout.write(\"%c\"%(c))\n",
+ " \n",
+ "sys.stdout.write(\"\\nAfter rewind() : \")\n",
+ "fp.seek(0)\n",
+ "#There is no rewind function in python\n",
+ "\n",
+ "while True:\n",
+ " c = fp.read(1)\n",
+ " if not c:\n",
+ " break\n",
+ " sys.stdout.write(\"%c\"%(c))\n",
+ " \n",
+ "fp.close()"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Pointer is at 12\n",
+ "Before rewind() : LEAD THE WORLD\n",
+ "After rewind() : TECHNOCRATS LEAD THE WORLD"
+ ]
+ }
+ ],
+ "prompt_number": 25
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.30, Page number: 484<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Delete the given file \n",
+ "\n",
+ "import sys\n",
+ "import os\n",
+ "\n",
+ "#Read file name\n",
+ "file1 = raw_input(\"Enter The File Name : \")\n",
+ "\n",
+ "#There is no remove or unlink file function in python.\n",
+ "#A file can be deleted using remove function in the os module.\n",
+ "\n",
+ "try:\n",
+ " os.remove(file1)\n",
+ " sys.stdout.write(\"\\nFile (%s) has been deleted!\"%(file1))\n",
+ "except:\n",
+ " sys.stdout.write(\"\\nFile does not exist\")\n",
+ "\n",
+ " "
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "File (TEXT.TXT) has been deleted!"
+ ]
+ }
+ ],
+ "prompt_number": 13
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.31, Page number: 485<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Change the name of the file\n",
+ "\n",
+ "import os\n",
+ "import sys\n",
+ "\n",
+ "old = raw_input(\"Old File Name : \")\n",
+ "\n",
+ "new = raw_input(\"New File Name : \")\n",
+ "\n",
+ "os.rename(old, new)\n",
+ "\n",
+ "#Check the directory to see the result\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [],
+ "prompt_number": 22
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.32, Page number: 486<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Copy the contents of one file to another file\n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "fs = open(\"a.txt\",\"r\")\n",
+ "ft = open(\"b.txt\",\"w\")\n",
+ "c = 0\n",
+ "\n",
+ "if fs == 0:\n",
+ " sys.stdout.write(\"\\nSource file opening error.\")\n",
+ "else:\n",
+ " if ft == 0:\n",
+ " sys.stdout.write(\"\\nTarget file opening error.\")\n",
+ " else:\n",
+ " while True:\n",
+ " ch = fs.read(1)\n",
+ " if not ch:\n",
+ " break\n",
+ " ft.write(\"%c\"%(ch))\n",
+ " c += 1\n",
+ " sys.stdout.write(\"\\n%d Bytes copied from 'a.txt' to 'b.txt'.\"%(c))\n",
+ " c = 0\n",
+ " #there is no fcloseall() function in python\n",
+ " fs.close()\n",
+ " c += 1\n",
+ " ft.close()\n",
+ " c += 1\n",
+ " sys.stdout.write(\"\\n%d files closed.\"%(c))"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "45 Bytes copied from 'a.txt' to 'b.txt'.\n",
+ "2 files closed."
+ ]
+ }
+ ],
+ "prompt_number": 5
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.33, Page number: 487<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Read the contents of three files and find the largest file\n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Variable Initialization\n",
+ "y = 0\n",
+ "k = 0\n",
+ "t = 0\n",
+ "name = [\"1.txt\",\"2.txt\",\"3.txt\"]\n",
+ "f = [0 for i in range(0,3)]\n",
+ "x = [0 for i in range(0,3)]\n",
+ "\n",
+ "#Open all the files\n",
+ "for l in range(0,3):\n",
+ " fp = open(name[l],\"r\")\n",
+ " f[l] = fp\n",
+ " if fp == 0:\n",
+ " sys.stdout.write(\"\\n%s file not found.\"%(name[l]))\n",
+ " break\n",
+ " \n",
+ "#Read contents of all files\n",
+ "for l in range(0,3):\n",
+ " while True:\n",
+ " c1 = f[l].read(1)\n",
+ " if not c1:\n",
+ " break\n",
+ " x[l] = y\n",
+ " y += 1\n",
+ " y = 0\n",
+ "\n",
+ "#close the files\n",
+ "for l in range(0,3):\n",
+ " f[l].close()\n",
+ "\n",
+ "#Print size of all files\n",
+ "for l in range(0,2+1):\n",
+ " sys.stdout.write(\"File : %s Bytes : %d\\n\"%(name[l],x[l]))\n",
+ " t = t + x[l]\n",
+ " \n",
+ "#Find largest\n",
+ "for l in range(t,1,-1):\n",
+ " for k in range(0,3):\n",
+ " if l == x[k]:\n",
+ " sys.stdout.write(\"\\n%s are the largest file.\"%(name[k]))\n",
+ " break\n",
+ " if l == x[k]:\n",
+ " break"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "File : 1.txt Bytes : 16\n",
+ "File : 2.txt Bytes : 20\n",
+ "File : 3.txt Bytes : 25\n",
+ "\n",
+ "3.txt are the largest file."
+ ]
+ }
+ ],
+ "prompt_number": 16
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.34, Page number: 488<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Copy 100 characters from a file to an array\n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Variable Initialization\n",
+ "SIZE = 100\n",
+ "s = 0\n",
+ "x = 0\n",
+ "ch = ['0' for i in range(0,100)]\n",
+ "\n",
+ "#Open the files\n",
+ "f = open(\"poem.txt\",\"r\")\n",
+ "f2 = open(\"alpha.txt\",\"w\")\n",
+ "\n",
+ "if f ==0 or f2 == 0:\n",
+ " sys.stdout.write(\"?\")\n",
+ "else:\n",
+ " while True:\n",
+ " c = f.read(1)\n",
+ " x += 1\n",
+ " if not c:\n",
+ " break\n",
+ " else:\n",
+ " if x == 99:\n",
+ " break\n",
+ " else:\n",
+ " ch[s] = c\n",
+ " s += 1\n",
+ "\n",
+ "for s in range(0,100):\n",
+ " f2.write(\"%c\"%(ch[s]))\n",
+ "\n",
+ "sys.stdout.write(\"Process Completed : Error 0\")\n",
+ "f.close()\n",
+ "f2.close()\n",
+ "\n",
+ "#There is no perror() function in python"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Process Completed : Error 0"
+ ]
+ }
+ ],
+ "prompt_number": 1
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.35, Page number: 491<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Low level disk I/O operations.\n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "\n",
+ "#Variable Initialization\n",
+ "file1 = raw_input(\"Enter a file name : \")\n",
+ "\n",
+ "#Open file\n",
+ "s = open(file1,\"w\")\n",
+ "\n",
+ "#Result\n",
+ "if s == -1:\n",
+ " sys.stdout.write(\"File does not exits\")\n",
+ "else:\n",
+ " buff = raw_input(\"Enter text below:\")\n",
+ " s.write(\"%s\"%(buff))\n",
+ " s.close()"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter a file name : TEXT\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter text below:PROGRAMMING IN C\n"
+ ]
+ }
+ ],
+ "prompt_number": 11
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.36, Page number: 492<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Read text from a specified file \n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Variable initialization\n",
+ "file1 = raw_input(\"Enter a file name \")\n",
+ "\n",
+ "#open file\n",
+ "s = open(file1,\"r\")\n",
+ "\n",
+ "#Result\n",
+ "if s == -1:\n",
+ " sys.stdout.write(\"File does not exists\")\n",
+ "else:\n",
+ " while True:\n",
+ " ch = s.read(1)\n",
+ " if not ch:\n",
+ " break\n",
+ " sys.stdout.write(\"%c\"%(ch))\n",
+ " \n",
+ "s.close()"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter a file name TEXT\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "PROGRAMMING IN C"
+ ]
+ }
+ ],
+ "prompt_number": 12
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.37, Page number: 493<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Set a buffer size \n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Result\n",
+ "sys.stdout.write(\"\\nThis book teaches C\")"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "This book teaches C"
+ ]
+ }
+ ],
+ "prompt_number": 6
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.38, Page number: 494<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Display number of arguments and their names\n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Result\n",
+ "sys.stdout.write(\"\\nTotal number of arguments are %d\\n\"%(len(sys.argv)))\n",
+ "\n",
+ "print str(sys.argv)\n",
+ "\n",
+ "#Command line arguments can be given in python by the command\n",
+ "\n",
+ "# python pgmname.py arg1 arg2 arg3\n",
+ "\n",
+ "#This is not possible in ipython notebook"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [],
+ "prompt_number": 8
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.39, Page number: 495<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Read any file from command prompt\n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#open file\n",
+ "fp = open(sys.argv[1],\"r\")\n",
+ "\n",
+ "#Result\n",
+ "if fp == 0:\n",
+ " sys.stdout.write(\"Can not open file\")\n",
+ "else:\n",
+ " while True:\n",
+ " ch = fp.read(1)\n",
+ " if not ch:\n",
+ " break\n",
+ " sys.stdout.write(\"%c\"%(ch))\n",
+ " \n",
+ "fp.close()\n",
+ "\n",
+ "#This program can be run in python as\n",
+ "\n",
+ "# python pgmname.py filename"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": []
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.40, Page number: 495<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Command line argument to perform the task of DEL command\n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Check number of arguments\n",
+ "if len(sys.argv) < 2:\n",
+ " sys.stdout.write(\"Insufficient Arguments\")\n",
+ "else:\n",
+ " fp = open(sys.argv[1],\"r\")\n",
+ " if fp == 0:\n",
+ " sys.stdout.write(\"File Not Found\")\n",
+ " fp.close()\n",
+ " os.remove(sys.argv[1])\n",
+ " sys.stdout.write(\"File has been deleted\")\n",
+ " \n",
+ "#This program can be deleted using\n",
+ "# python pgmname.py filename\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": []
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.41, Page number: 496<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Command line argument to perform the task of REN command\n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Check number of arguments\n",
+ "if len(sys.srgv) < 3:\n",
+ " sys.stdout.write(\"Insufficient Arguments\")\n",
+ "else:\n",
+ " fp = open(sys.argv[1],\"r\")\n",
+ " if fp == 0:\n",
+ " sys.stdout.write(\"File Not Found\")\n",
+ " else:\n",
+ " sp = open(sys.argv[2],\"r\")\n",
+ " if sp == 0:\n",
+ " fp.close()\n",
+ " sp.close()\n",
+ " #Rename file\n",
+ " os.rename(sys.argv[1],sys.argv[2])\n",
+ " else:\n",
+ " sys.stdout.write(\"Duplicate file name or file is in use\")\n",
+ " \n",
+ "#This program can be executed as\n",
+ "\n",
+ "# python pgmname.py oldfilename newfilename\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": []
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.42, Page number: 497<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Environment variable and display the various settings.\n",
+ "\n",
+ "import sys\n",
+ "import os\n",
+ "\n",
+ "#Result\n",
+ "print os.environ\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "{'TMP': 'C:\\\\Users\\\\Aathira\\\\AppData\\\\Local\\\\Temp', 'COMPUTERNAME': 'AATHIRA-PC', 'GUROBI_HOME': 'B:\\\\gurobi510\\\\win32', 'USERDOMAIN': 'Aathira-PC', 'PSMODULEPATH': 'C:\\\\Windows\\\\system32\\\\WindowsPowerShell\\\\v1.0\\\\Modules\\\\', 'COMMONPROGRAMFILES': 'C:\\\\Program Files (x86)\\\\Common Files', 'PROCESSOR_IDENTIFIER': 'Intel64 Family 6 Model 15 Stepping 13, GenuineIntel', 'PROGRAMFILES': 'C:\\\\Program Files (x86)', 'PROCESSOR_REVISION': '0f0d', 'SYSTEMROOT': 'C:\\\\Windows', 'PATH': 'C:\\\\Anaconda\\\\lib\\\\site-packages\\\\numpy\\\\core;B:\\\\gurobi510\\\\win32\\\\bin;C:\\\\Windows\\\\system32;C:\\\\Windows;C:\\\\Windows\\\\System32\\\\Wbem;C:\\\\Windows\\\\System32\\\\WindowsPowerShell\\\\v1.0\\\\;C:\\\\Program Files (x86)\\\\Common Files\\\\Adobe\\\\AGL;C:\\\\Program Files\\\\MATLAB\\\\R2009a\\\\bin;C:\\\\Program Files\\\\MATLAB\\\\R2009a\\\\bin\\\\win64;c:\\\\python27\\\\scripts;C:\\\\Program Files (x86)\\\\MiKTeX 2.9\\\\miktex\\\\bin\\\\;C:\\\\Anaconda;C:\\\\Anaconda\\\\Scripts;C:\\\\Program Files (x86)\\\\ffmpeg', 'CLICOLOR': '1', 'PROGRAMFILES(X86)': 'C:\\\\Program Files (x86)', 'COMSPEC': 'C:\\\\Windows\\\\system32\\\\cmd.exe', 'TK_LIBRARY': 'C:\\\\Anaconda\\\\tcl\\\\tk8.5', 'TERM': 'xterm-color', 'TEMP': 'C:\\\\Users\\\\Aathira\\\\AppData\\\\Local\\\\Temp', 'COMMONPROGRAMFILES(X86)': 'C:\\\\Program Files (x86)\\\\Common Files', 'PROCESSOR_ARCHITECTURE': 'x86', 'TIX_LIBRARY': 'C:\\\\Anaconda\\\\tcl\\\\tix8.4.3', 'ALLUSERSPROFILE': 'C:\\\\ProgramData', 'LOCALAPPDATA': 'C:\\\\Users\\\\Aathira\\\\AppData\\\\Local', 'HOMEPATH': '\\\\Users\\\\Aathira', 'PROGRAMW6432': 'C:\\\\Program Files', 'USERNAME': 'Aathira', 'LOGONSERVER': '\\\\\\\\AATHIRA-PC', 'SESSIONNAME': 'Console', 'PROGRAMDATA': 'C:\\\\ProgramData', 'TCL_LIBRARY': 'C:\\\\Anaconda\\\\tcl\\\\tcl8.5', 'GIT_PAGER': 'cat', 'PATHEXT': '.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC', 'FP_NO_HOST_CHECK': 'NO', 'WINDIR': 'C:\\\\Windows', 'APPDATA': 'C:\\\\Users\\\\Aathira\\\\AppData\\\\Roaming', 'HOMEDRIVE': 'C:', 'PAGER': 'cat', 'SYSTEMDRIVE': 'C:', 'NUMBER_OF_PROCESSORS': '2', 'PROCESSOR_LEVEL': '6', 'PROCESSOR_ARCHITEW6432': 'AMD64', 'COMMONPROGRAMW6432': 'C:\\\\Program Files\\\\Common Files', 'OS': 'Windows_NT', 'PUBLIC': 'C:\\\\Users\\\\Public', 'USERPROFILE': 'C:\\\\Users\\\\Aathira'}\n"
+ ]
+ }
+ ],
+ "prompt_number": 3
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.43, Page number: 498<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Read character from keyboard \n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "c = '0'\n",
+ "\n",
+ "#Result\n",
+ "while c != ' ':\n",
+ " c = raw_input(\"\")\n",
+ " sys.stdout.write(\"%c \"%(c))\n",
+ " \n",
+ "#Give space at the end"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "1 2 "
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "3 4 "
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "5 6 "
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "7 8 "
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "9 "
+ ]
+ }
+ ],
+ "prompt_number": 9
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "<h3>Example 14.44, Page number: 499<h3>"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Display A to Z characters\n",
+ "\n",
+ "import sys\n",
+ "\n",
+ "#Result\n",
+ "for a in range(65,91):\n",
+ " sys.stdout.write(\"%c\\t\"%(chr(a)))"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "A\tB\tC\tD\tE\tF\tG\tH\tI\tJ\tK\tL\tM\tN\tO\tP\tQ\tR\tS\tT\tU\tV\tW\tX\tY\tZ\t"
+ ]
+ }
+ ],
+ "prompt_number": 11
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [],
+ "language": "python",
+ "metadata": {},
+ "outputs": []
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+}
\ No newline at end of file |