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+{
+ "metadata": {
+ "name": "",
+ "signature": "sha256:619858f96c40102945d24a70a3fd99304f6fb166114144600528626d39e31490"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "Hour 22 : Using Special File Functions"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 22.1, Page No 375"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "def PtrSeek(fptr):\n",
+ " offset1 = PtrTell(fptr)\n",
+ " DataRead(fptr)\n",
+ " offset2 = PtrTell(fptr)\n",
+ " DataRead(fptr)\n",
+ " offset3 = PtrTell(fptr)\n",
+ " DataRead(fptr)\n",
+ " print \"\\nRe-read the haiku:\\n\"\n",
+ " fptr.seek(offset3)\n",
+ " DataRead(fptr)\n",
+ " fptr.seek(offset2)\n",
+ " DataRead(fptr)\n",
+ " fptr.seek(offset1)\n",
+ " DataRead(fptr)\n",
+ "def PtrTell(fprt):\n",
+ " reval = fptr.tell()\n",
+ " print \"The fptr is at: \",reval,\"\\n\"\n",
+ " return reval\n",
+ "def DataRead(fptr):\n",
+ " buff = range(80)\n",
+ " buff = fptr.readline()\n",
+ " print buff\n",
+ "def ErrorMsg(str):\n",
+ " print \"Cannot open\",str,\"\\n\"\n",
+ " return FAIL\n",
+ "MAX_LEN = 80\n",
+ "try:\n",
+ " filename = \"haiku.txt\"\n",
+ " reval = \"SUCCESS\"\n",
+ " fptr = open(filename,\"r\")\n",
+ " if(not isinstance(fptr,file)):\n",
+ " reval = ErrorMsg(filename)\n",
+ " else:\n",
+ " PtrSeek(fptr)\n",
+ " fptr.close()\n",
+ "except IOError:\n",
+ " print \"\\nFile can not be opened\\n\"\n",
+ " \n",
+ " \n",
+ "\"\"\"\n",
+ "haiku.txt (Read file)\n",
+ "Leading me along\n",
+ "my shadow goes back home\n",
+ "from looking at the moon.\n",
+ "--- Sodo\n",
+ "(1641-1716)\n",
+ "A storm wind blows\n",
+ "out from among the grasses\n",
+ "the full moon grows.\n",
+ "--- Chora\n",
+ "(1729-1781)\n",
+ "\"\"\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The fptr is at: 0 \n",
+ "\n",
+ "Leading me along\n",
+ "\n",
+ "The fptr is at: 18 \n",
+ "\n",
+ "my shadow goes back home\n",
+ "\n",
+ "The fptr is at: 44 \n",
+ "\n",
+ "from looking at the moon.\n",
+ "\n",
+ "\n",
+ "Re-read the haiku:\n",
+ "\n",
+ "from looking at the moon.\n",
+ "\n",
+ "my shadow goes back home\n",
+ "\n",
+ "Leading me along\n",
+ "\n"
+ ]
+ }
+ ],
+ "prompt_number": 3
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 22.2, Page No 379"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "import sys\n",
+ "MAX_NUM = 3\n",
+ "def DataWrite(fout):\n",
+ " buff = [123.45,567.89,100.11]\n",
+ " print \"The size of buff:\",sys.getsizeof(buff),\"-byte\\n\u201d, sizeof(buff)\"\n",
+ " for i in range(MAX_NUM):\n",
+ " print buff[i],\"\\n\"\n",
+ " fout.write(str(buff[i]) + \"\\n\")\n",
+ "def DataRead(fin):\n",
+ " print \"\\nRead back from the binary file:\\n\"\n",
+ " for i in range(MAX_NUM):\n",
+ " x = fin.readline()\n",
+ " print x,\"\\n\"\n",
+ "def ErrorMsg(str):\n",
+ " print \"Cannot open\",str,\"\\n\"\n",
+ " return FAIL\n",
+ "try:\n",
+ " filename = \"double.bin\"\n",
+ " reval = \"SUCCESS\"\n",
+ " fptr = open(filename,\"wb\")\n",
+ " if(not isinstance(fptr,file)):\n",
+ " reval = ErrorMsg(filename)\n",
+ " else:\n",
+ " DataWrite(fptr)\n",
+ " # rewind(fptr) No Such Function In Python\n",
+ " fptr.close()\n",
+ " fptr = open(filename,\"r\")\n",
+ " DataRead(fptr)\n",
+ " fptr.close()\n",
+ "except IOError:\n",
+ " print \"\\nFile can not be opened\\n\"\n",
+ "\n",
+ "\"\"\"\n",
+ "double.bin (Writing Binary File)\n",
+ "123.45\n",
+ "567.89\n",
+ "100.11\n",
+ "\"\"\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The size of buff: 88 -byte\n",
+ "\u201d, sizeof(buff)\n",
+ "123.45 \n",
+ "\n",
+ "567.89 \n",
+ "\n",
+ "100.11 \n",
+ "\n",
+ "\n",
+ "Read back from the binary file:\n",
+ "\n",
+ "123.45\n",
+ "\n",
+ "\n",
+ "567.89\n",
+ "\n",
+ "\n",
+ "100.11\n",
+ "\n",
+ "\n"
+ ]
+ }
+ ],
+ "prompt_number": 16
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 22.3, Page No 382"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "import sys\n",
+ "MAX_NUM = 3\n",
+ "STR_LEN = 23\n",
+ "def DataWrite(fout):\n",
+ " cities = range(MAX_NUM)\n",
+ " cities = [\"St.Louis->Houston:\",\"Houston->Dallas:\",\"Dallas->Philadelphia:\"]\n",
+ " miles = range(MAX_NUM)\n",
+ " miles = [845,243,1459]\n",
+ " print \"The data written:\\n\"\n",
+ " for i in range(MAX_NUM):\n",
+ " print cities[i],miles[i],\"\\n\"\n",
+ " fout.writelines(str(cities[i]) + str(miles[i]) + \"\\n\")\n",
+ "def DataRead(fin):\n",
+ " print \"\\nThe data read:\\n\"\n",
+ " for i in range(MAX_NUM):\n",
+ " cities = fin.read()\n",
+ " miles = fin.read()\n",
+ " print cities,miles\n",
+ "def ErrorMsg(str):\n",
+ " print \"Cannot open\",str,\"\\n\"\n",
+ " return FAIL\n",
+ "try:\n",
+ " filename = \"strnum.mix\"\n",
+ " reval = \"SUCCESS\"\n",
+ " fptr = open(filename,\"w+\")\n",
+ " if(not isinstance(fptr,file)):\n",
+ " reval = ErrorMsg(filename)\n",
+ " else:\n",
+ " DataWrite(fptr)\n",
+ " # rewind(fptr) No Such Function In Python\n",
+ " fptr.close()\n",
+ " fptr = open(filename,\"r\")\n",
+ " DataRead(fptr)\n",
+ " fptr.close()\n",
+ "except IOError:\n",
+ " print \"\\nFile can not be opened\\n\"\n",
+ "\"\"\"\n",
+ "strnum.mix (Writing and Reading File)\n",
+ "St.Louis->Houston:845\n",
+ "Houston->Dallas:243\n",
+ "Dallas->Philadelphia:1459\n",
+ "\"\"\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The data written:\n",
+ "\n",
+ "St.Louis->Houston: 845 \n",
+ "\n",
+ "Houston->Dallas: 243 \n",
+ "\n",
+ "Dallas->Philadelphia: 1459 \n",
+ "\n",
+ "\n",
+ "The data read:\n",
+ "\n",
+ "St.Louis->Houston:845\n",
+ "Houston->Dallas:243\n",
+ "Dallas->Philadelphia:1459\n",
+ "\n",
+ " \n",
+ " \n"
+ ]
+ }
+ ],
+ "prompt_number": 20
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 22.4, Page No 385"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "STR_NUM = 4\n",
+ "def ErrorMsg(str1):\n",
+ " print \"Cannot open\",str,\"\\n\"\n",
+ " return FAIL\n",
+ "def StrPrint(str1):\n",
+ " for i in range(STR_NUM):\n",
+ " print str1[i],\"\\n\"\n",
+ " stdout.writelines(str1[i] + \"\\n\")\n",
+ " \n",
+ "try:\n",
+ " str1 = range(STR_NUM)\n",
+ " str1 = [\"Be bent, and you will remain straight.\",\"Be vacant, and you will remain full.\",\"Be worn, and you will remain new.\",\"--- by Lao Tzu\"]\n",
+ " filename = \"LaoTzu.txt\"\n",
+ " reval = \"SUCCESS\"\n",
+ " stdout = open(filename,\"w+\")\n",
+ " StrPrint(str1)\n",
+ " stdout.close()\n",
+ " stdout = open(filename,\"w+\")\n",
+ " if(not isinstance(stdout,file)):\n",
+ " reval = ErrorMsg(filename)\n",
+ " else:\n",
+ " StrPrint(str1)\n",
+ " stdout.close()\n",
+ "except IOError:\n",
+ " print \"\\nFile can not be opened\\n\"\n",
+ "\n",
+ "\"\"\"\n",
+ " Output File : LaoTzu.txt\n",
+ " \n",
+ " Be bent, and you will remain straight.\n",
+ "Be vacant, and you will remain full.\n",
+ "Be worn, and you will remain new.\n",
+ "--- by Lao Tzu\n",
+ "\n",
+ "\n",
+ "\"\"\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Be bent, and you will remain straight. \n",
+ "\n",
+ "Be vacant, and you will remain full. \n",
+ "\n",
+ "Be worn, and you will remain new. \n",
+ "\n",
+ "--- by Lao Tzu \n",
+ "\n",
+ "Be bent, and you will remain straight. \n",
+ "\n",
+ "Be vacant, and you will remain full. \n",
+ "\n",
+ "Be worn, and you will remain new. \n",
+ "\n",
+ "--- by Lao Tzu \n",
+ "\n"
+ ]
+ }
+ ],
+ "prompt_number": 4
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+} \ No newline at end of file
generated by cgit (git 2.34.1) at 2024-12-20 10:42:03 +0000