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{
"metadata": {
"name": "",
"signature": "sha256:3c3bf16deef4fec8e871033ad86caaf2229bc23c73902bfdcf895c53cd295312"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Hour 21 : Reading and Writing with Files"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 21.1, Page No 359"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"try:\n",
" filename = \"haiku.txt\"\n",
" reval = \"SUCCESS\"\n",
" fptr = open(filename,\"r\")\n",
" if(not isinstance(fptr,file)):\n",
" print \"\\nCan not open \",filename,\"\\n\"\n",
" reval = \"FAIL\"\n",
" else:\n",
" print \"The value of fptr: \",fptr,\"\\n\"\n",
" print \"Ready to close the file.\"\n",
" fptr.close()\n",
"except IOError:\n",
" print \"\\nFile can not be opened\\n\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The value of fptr: <open file 'haiku.txt', mode 'r' at 0x000000000394DB70> \n",
"\n",
"Ready to close the file.\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 21.2, Page No 361"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"def CharReadWrite(fin,fout):\n",
" while(1):\n",
" c = fin.readline()\n",
" if c == \"\":\n",
" break\n",
" else:\n",
" print c\n",
" fout.writelines(c)\n",
"try:\n",
" filename1 = \"outhaiku.txt\"\n",
" filename2 = \"haiku.txt\"\n",
" reval = \"SUCCESS\"\n",
" fptr1 = open(filename1,\"w\")\n",
" fptr2 = open(filename2,\"r\")\n",
" if(not isinstance(fptr1,file)):\n",
" print \"\\nCan not open \",filename1,\"\\n\"\n",
" reval = \"FAIL\"\n",
" elif(not isinstance(fptr1,file)):\n",
" print \"\\nCan not open \",filename2,\"\\n\"\n",
" reval = \"FAIL\"\n",
" else:\n",
" CharReadWrite(fptr2,fptr1)\n",
" fptr1.close()\n",
" fptr2.close()\n",
"except IOError:\n",
" print \"\\nFile can not be opened\\n\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Leading me along\n",
"\n",
"my shadow goes back home\n",
"\n",
"from looking at the moon.\n",
"\n",
"--- Sodo\n",
"\n",
"(1641-1716)\n",
"\n",
"A storm wind blows\n",
"\n",
"out from among the grasses\n",
"\n",
"the full moon grows.\n",
"\n",
"--- Chora\n",
"\n",
"(1729-1781)\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 21.3, Page No 364"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"def LineReadWrite(fin,fout):\n",
" while(1):\n",
" c = fin.readline()\n",
" if c == \"\":\n",
" break\n",
" else:\n",
" print c\n",
" fout.writelines(c)\n",
"try:\n",
" filename1 = \"outhaiku.txt\"\n",
" filename2 = \"haiku.txt\"\n",
" reval = \"SUCCESS\"\n",
" fptr1 = open(filename1,\"w\")\n",
" fptr2 = open(filename2,\"r\")\n",
" if(not isinstance(fptr1,file)):\n",
" print \"\\nCan not open \",filename1,\"\\n\"\n",
" reval = \"FAIL\"\n",
" elif(not isinstance(fptr1,file)):\n",
" print \"\\nCan not open \",filename2,\"\\n\"\n",
" reval = \"FAIL\"\n",
" else:\n",
" LineReadWrite(fptr2,fptr1)\n",
" fptr1.close()\n",
" fptr2.close()\n",
"except IOError:\n",
" print \"\\nFile can not be opened\\n\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Leading me along\n",
"\n",
"my shadow goes back home\n",
"\n",
"from looking at the moon.\n",
"\n",
"--- Sodo\n",
"\n",
"(1641-1716)\n",
"\n",
"A storm wind blows\n",
"\n",
"out from among the grasses\n",
"\n",
"the full moon grows.\n",
"\n",
"--- Chora\n",
"\n",
"(1729-1781)\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 21.4, Page No 368"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"def BlockReadWrite(fin,fout):\n",
" while(1):\n",
" c = fin.readline()\n",
" if c == \"\":\n",
" break\n",
" else:\n",
" print c\n",
" fout.writelines(c)\n",
"def ErrorMsg(str1):\n",
" print \"Cannot open: \",str1,\"\\n\"\n",
" return FAIL\n",
"try:\n",
" filename1 = \"outhaiku.txt\"\n",
" filename2 = \"haiku.txt\"\n",
" reval = \"SUCCESS\"\n",
" fptr1 = open(filename1,\"w\")\n",
" fptr2 = open(filename2,\"r\")\n",
" if(not isinstance(fptr1,file)):\n",
" print \"\\nCan not open \",filename1,\"\\n\"\n",
" reval = ErrorMsg(filename1)\n",
" elif(not isinstance(fptr1,file)):\n",
" print \"\\nCan not open \",filename2,\"\\n\"\n",
" reval = ErrorMsg(filename2)\n",
" else:\n",
" BlockReadWrite(fptr2,fptr1)\n",
" fptr1.close()\n",
" fptr2.close()\n",
"except IOError:\n",
" print \"\\nFile can not be opened\\n\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Leading me along\n",
"\n",
"my shadow goes back home\n",
"\n",
"from looking at the moon.\n",
"\n",
"--- Sodo\n",
"\n",
"(1641-1716)\n",
"\n",
"A storm wind blows\n",
"\n",
"out from among the grasses\n",
"\n",
"the full moon grows.\n",
"\n",
"--- Chora\n",
"\n",
"(1729-1781)\n"
]
}
],
"prompt_number": 3
}
],
"metadata": {}
}
]
}
|
