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-rw-r--r--ANSI_C_Programming/chapter12.ipynb2909
1 files changed, 1455 insertions, 1454 deletions
diff --git a/ANSI_C_Programming/chapter12.ipynb b/ANSI_C_Programming/chapter12.ipynb
index 1c8b157f..8bab1a13 100644
--- a/ANSI_C_Programming/chapter12.ipynb
+++ b/ANSI_C_Programming/chapter12.ipynb
@@ -1,1455 +1,1456 @@
-{
- "metadata": {
- "name": "chapter12.ipynb"
- },
- "nbformat": 3,
- "nbformat_minor": 0,
- "worksheets": [
- {
- "cells": [
- {
- "cell_type": "heading",
- "level": 1,
- "metadata": {},
- "source": [
- "CHAPTER 12:FILE INPUT/OUTPUT"
- ]
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "EXAMPLE ON PAGE:391"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#Reads strings from the file and displays them on screen\n",
- "fp=open('PR1.txt','r') #open the file for reading\n",
- "ch=fp.readlines() #ch will store all content of file\n",
- "print \"%s\" % (' '.join(ch)) #prints content of file\n",
- "print \"\\n\"\n",
- "fp.close()"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "site:http://www.bzu.edu.pk/\n",
- " user:siteuser@localhost\n",
- " version:5.5.32-0ubuntu0.12.04.1\n",
- " db: bzu\n",
- " tables:\n",
- " username:web,webadmin,webadministrator23\n",
- " pass:71dc9f7af599450b23a3b5d54bc665c7,\t49fa1a081c8d5c8dcfa05d730803251a,\t*E8665C4049F515D836A3C8704D0543C6DA0FE96D\n",
- "\n",
- "\n"
- ]
- }
- ],
- "prompt_number": 8
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "EXAMPLE ON PAGE:394"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#Showing error in opening a file\n",
- "try:\n",
- " fp=open('yoyo.txt','r')\n",
- " for line in fin:\n",
- " print line\n",
- " fp.close()\n",
- "except:\n",
- " print 'cannot open file'"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "cannot open file\n"
- ]
- }
- ],
- "prompt_number": 9
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "EXAMPLE ON PAGE:395"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#Count chars, spaces, tabs and newlines in a file\n",
- "nol=0\n",
- "nom=0\n",
- "nob=0\n",
- "noc=0\n",
- "fp=open('H4CK3R.txt','r')\n",
- "while True:\n",
- " ch=fp.read(1)\n",
- " if not ch:\n",
- " break\n",
- " noc+=1\n",
- " if ch==' ':\n",
- " nob+=1\n",
- " if ch=='\\n':\n",
- " nol+=1\n",
- " if ch=='\\t':\n",
- " nom+=1\n",
- "fp.close()\n",
- "print \"\\n\"\n",
- "fp.close()\n",
- "print \"Number of characters=%d\\n\" % (noc)\n",
- "print \"Number of blanks=%d\\n\" % (nob)\n",
- "print \"Number of tabs=%d\\n\" % (nom)\n",
- "print \"Number of lines=%d\\n\" % (nol)"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "\n",
- "\n",
- "Number of characters=162\n",
- "\n",
- "Number of blanks=21\n",
- "\n",
- "Number of tabs=3\n",
- "\n",
- "Number of lines=4\n",
- "\n"
- ]
- }
- ],
- "prompt_number": 10
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "EXAMPLE ON PAGE:396-397"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#Program that copies the content of one file into another\n",
- "import sys\n",
- "try:\n",
- " fs=open('H4CK3R.txt','r')\n",
- "except:\n",
- " print \"Cannot open file\"\n",
- " sys.exit(1)\n",
- "try:\n",
- " ft=open('python.txt','w')\n",
- "except:\n",
- " print \"Cannot open file\"\n",
- " fs.close()\n",
- " sys.exit(2)\n",
- "ch=fs.readlines()\n",
- "ft.writelines(ch)\n",
- "fs.close()\n",
- "ft.close()"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [],
- "prompt_number": 13
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "EXAMPLE ON PAGE:399"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#Receives strings from keyboard and writes them to file\n",
- "try:\n",
- " fp=open('POEM.txt','w')\n",
- "except:\n",
- " print 'cannot open file'\n",
- "print \"\\nEnter a few lines of text:\\n\"\n",
- "s=' '\n",
- "while (len(s)>0):\n",
- " s=raw_input()\n",
- " fp.writelines(s)\n",
- " fp.writelines(\"\\n\")\n",
- "fp.close()"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "\n",
- "Enter a few lines of text:\n",
- "\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Shining and bright,they are forever,\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "so true about diamonds,\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "more so of memories,\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "especially yours!\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "\n"
- ]
- }
- ],
- "prompt_number": 15
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "EXAMPLE ON PAGE:400"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#Reads strings from the file and displays them on screen\n",
- "try:\n",
- " fp=open('POEM.txt','r')\n",
- "except:\n",
- " print 'cannot open file'\n",
- "s=fp.read(99)\n",
- "print \"%s\" % (s)\n",
- "print \"\\n\"\n",
- "fp.close()"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Shining and bright,they are forever,\n",
- "so true about diamonds,\n",
- "more so of memories,\n",
- "especially yours!\n",
- "\n",
- "\n"
- ]
- }
- ],
- "prompt_number": 16
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "EXAMPLE ON PAGE:401-402"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#Writes records to a file using structure\n",
- "class emp():\n",
- " def __init__(self,**kwds):\n",
- " self.__dict__.update(kwds)\n",
- "another='Y'\n",
- "e=emp()\n",
- "try:\n",
- " fp=open('EMPLOYEE.txt','w')\n",
- "except:\n",
- " print 'cannot open file'\n",
- "while another=='Y':\n",
- " print \"\\nEnter name,age and basic salary:\"\n",
- " e.name=raw_input()\n",
- " e.age=eval(raw_input())\n",
- " e.bs=eval(raw_input())\n",
- " ch=\"%s %d %f\" % (e.name,e.age,e.bs)\n",
- " fp.writelines(ch)\n",
- " fp.writelines(\"\\n\")\n",
- " print \"Add another record(Y/N)\"\n",
- " another=raw_input()\n",
- "fp.close()"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "\n",
- "Enter name,age and basic salary:\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Sunil\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "34\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "1250.50\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Add another record(Y/N)\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Y\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "\n",
- "Enter name,age and basic salary:\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Sameer\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "21\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "1300.50\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Add another record(Y/N)\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Y\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "\n",
- "Enter name,age and basic salary:\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Rahul\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "34\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "1400.55\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Add another record(Y/N)\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "n\n"
- ]
- }
- ],
- "prompt_number": 17
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "EXAMPLE ON PAGE:403-404"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#Read records from a file using structure\n",
- "class emp():\n",
- " def __init__(self,**kwds):\n",
- " self.__dict__.update(kwds)\n",
- "e=emp()\n",
- "try:\n",
- " fp=open('EMPLOYEE.txt','r') # open the file for reading\n",
- "except:\n",
- " print 'cannot open file'\n",
- "for line in fp: # iterate over each line\n",
- " e.name, e.age, e.bs = line.split() # split it by whitespace\n",
- " e.age = int(e.age) # convert age from string to int\n",
- " e.bs = float(e.bs) # convert bs from string to float\n",
- " print \"%s %d %f\\n\" %(e.name, e.age, e.bs)\n",
- "fp.close()"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Sunil 34 1250.500000\n",
- "\n",
- "Sameer 21 1300.500000\n",
- "\n",
- "Rahul 34 1400.550000\n",
- "\n"
- ]
- }
- ],
- "prompt_number": 18
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "EXAMPLE ON PAGE:404-405"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#program to copy text as well as binary files\n",
- "import sys #for exit()\n",
- "try:\n",
- " fs=open('H4CK3R.txt','rb') # open the file for reading\n",
- "except:\n",
- " print 'cannot open file'\n",
- " sys.exit(1)\n",
- "try:\n",
- " ft=open('python.txt','wb') # open the file for writing\n",
- "except:\n",
- " print 'cannot open file'\n",
- " fs.close()\n",
- " sys.exit(2)\n",
- "ch=fs.readlines()\n",
- "ft.writelines(ch)\n",
- "fs.close()\n",
- "ft.close()"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [],
- "prompt_number": 20
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "EXAMPLE ON PAGE:407-408"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#Receives records from keyboard and writes them to a file in binary mode\n",
- "class emp():\n",
- " def __init__(self,**kwds):\n",
- " self.__dict__.update(kwds)\n",
- "another='Y'\n",
- "e=emp()\n",
- "try:\n",
- " fp=open('EMP.txt','wb') # open the file for reading\n",
- "except:\n",
- " print 'cannot open file' \n",
- "while another=='Y':\n",
- " print \"\\nEnter name,age and basic salary:\"\n",
- " e.name=raw_input()\n",
- " e.age=eval(raw_input())\n",
- " e.bs=eval(raw_input())\n",
- " ch=\"%s %d %f\" % (e.name,e.age,e.bs)\n",
- " fp.writelines(ch)\n",
- " print \"Add another record (Y/N)\"\n",
- " another=raw_input()\n",
- " if another=='Y':\n",
- " fp.writelines(\"\\n\")\n",
- "fp.close()"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "\n",
- "Enter name,age and basic salary:\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Suresh\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "24\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "1250.50\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Add another record (Y/N)\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Y\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "\n",
- "Enter name,age and basic salary:\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Ranjan\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "21\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "1300.60\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Add another record (Y/N)\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Y\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "\n",
- "Enter name,age and basic salary:\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Harish\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "28\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "1400.70\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Add another record (Y/N)\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "N\n"
- ]
- }
- ],
- "prompt_number": 21
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "EXAMPLE ON PAGE:409"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#Read records from binary file and displays them on VDU\n",
- "class emp():\n",
- " def __init__(self,**kwds):\n",
- " self.__dict__.update(kwds)\n",
- "e=emp()\n",
- "try:\n",
- " fp=open('EMP.txt','rb')\n",
- "except:\n",
- " print \"Cannot open file\"\n",
- "for line in fp:\n",
- " e.name, e.age, e.bs = line.split() # split it by whitespace\n",
- " e.age = int(e.age) # convert age from string to int\n",
- " e.bs = float(e.bs) # convert bs from string to float\n",
- " print \"%s %d %f\\n\" %(e.name, e.age, e.bs)\n",
- "fp.close()"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Suresh 24 1250.500000\n",
- "\n",
- "Ranjan 21 1300.600000\n",
- "\n",
- "Harish 28 1400.700000\n",
- "\n"
- ]
- }
- ],
- "prompt_number": 22
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "EXAMPLE ON PAGE:411-414"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#A menu-driven program for elementary database management\n",
- "class emp():\n",
- " def __init__(self,**kwds):\n",
- " self.__dict__.update(kwds)\n",
- "e=emp()\n",
- "try:\n",
- " fp=open('EMP.txt','rb+') # open the file for reading\n",
- "except:\n",
- " try:\n",
- " fp=open('EMP.txt','wb+') # open the file for writing\n",
- " except:\n",
- " print 'cannot open file'\n",
- "while 1:\n",
- " print \"1.Add Records\"\n",
- " print \"2.List Records\"\n",
- " print \"3.Modify Records\"\n",
- " print \"4.Delete Records\"\n",
- " print \"0.Exit\"\n",
- " print \"Your choice\"\n",
- " choice=eval(raw_input())\n",
- " def add():\n",
- " import os\n",
- " fp.seek(0,os.SEEK_END)\n",
- " another='Y'\n",
- " while another=='Y':\n",
- " print \"\\nEnter name,age and basic salary:\"\n",
- " e.name=raw_input()\n",
- " e.age=eval(raw_input())\n",
- " e.bs=eval(raw_input())\n",
- " ch=\"%s %d %f\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\" % (e.name,e.age,e.bs)\n",
- " fp.writelines(\"\\n\")\n",
- " fp.writelines(ch)\n",
- " print \"Add another record(Y/N)\"\n",
- " another=raw_input()\n",
- " def list():\n",
- " import os\n",
- " fp.seek(0,os.SEEK_SET)\n",
- " for line in fp: # iterate over each line\n",
- " if len(line)>10:\n",
- " e.name, e.age, e.bs = line.split() # split it by whitespace\n",
- " e.age = int(e.age) # convert age from string to int\n",
- " e.bs = float(e.bs) # convert bs from string to float\n",
- " print \"%s %d %f\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\" %(e.name, e.age, e.bs)\n",
- " def modify():\n",
- " another='Y'\n",
- " while another=='Y':\n",
- " print \"\\nEnter name of employee to modify\"\n",
- " empname=raw_input()\n",
- " import os\n",
- " fp.seek(0,os.SEEK_SET)\n",
- " for line in iter(fp.readline, ''):\n",
- " if len(line)>10:\n",
- " e.name, e.age, e.bs=line.split()\n",
- " e.age = int(e.age) # convert age from string to int\n",
- " e.bs = float(e.bs)\n",
- " if(cmp(e.name,empname)==0):\n",
- " c=len(line)\n",
- " print \"\\nEnter new name,age & bs\"\n",
- " e.name=raw_input()\n",
- " e.age=eval(raw_input())\n",
- " e.bs=eval(raw_input())\n",
- " import os\n",
- " fp.seek(-c,os.SEEK_CUR)\n",
- " ch=\"%s %d %f\" % (e.name,e.age,e.bs)\n",
- " fp.writelines(\"\\n\")\n",
- " fp.writelines(ch)\n",
- " fp.writelines(\"\\n\")\n",
- " break\n",
- " print \"\\nModify another Record(Y/N)\"\n",
- " another=raw_input()\n",
- " def delete():\n",
- " another='Y'\n",
- " global fp\n",
- " while another=='Y':\n",
- " print \"\\nEnter name of employee to delete\"\n",
- " empname=raw_input()\n",
- " ft=open('TEMP.txt','wb')\n",
- " import os\n",
- " fp.seek(0,os.SEEK_SET)\n",
- " for line in fp:\n",
- " if len(line)>10:\n",
- " e.name, e.age, e.bs=line.split()\n",
- " e.age = int(e.age) # convert age from string to int\n",
- " e.bs = float(e.bs)\n",
- " if(cmp(e.name,empname)!=0):\n",
- " ch=\"%s %d %f\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\" % (e.name,e.age,e.bs)\n",
- " ft.writelines(ch)\n",
- " ft.writelines(\"\\n\")\n",
- " fp.close()\n",
- " ft.close()\n",
- " import os\n",
- " os.remove(\"EMP.txt\") # Delete file EMP.txt\n",
- " os.rename( \"TEMP.txt\", \"D:/EMP.txt\" ) # Rename a file from TEMP.txt to EMP.txt\n",
- " fp=open('EMP.txt','rb+')\n",
- " print \"Delete another record(Y/N)\"\n",
- " another=raw_input()\n",
- " def exit():\n",
- " import sys\n",
- " fp.close()\n",
- " sys.exit(0)\n",
- " def switch(c):\n",
- " return {1: add,\n",
- " 2: list,\n",
- " 3: modify,\n",
- " 4: delete,\n",
- " 0: exit,\n",
- " }[c]()\n",
- " switch(choice)"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "1.Add Records\n",
- "2.List Records\n",
- "3.Modify Records\n",
- "4.Delete Records\n",
- "0.Exit\n",
- "Your choice\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "2\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Suresh 24 1250.500000\t\t\t\t\t\t\t\t\t\t\n",
- "Ranjan 21 1300.600000\t\t\t\t\t\t\t\t\t\t\n",
- "Harish 28 1400.700000\t\t\t\t\t\t\t\t\t\t\n",
- "1.Add Records\n",
- "2.List Records\n",
- "3.Modify Records\n",
- "4.Delete Records\n",
- "0.Exit\n",
- "Your choice\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "1\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "\n",
- "Enter name,age and basic salary:\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Ram\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "20\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "5000\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Add another record(Y/N)\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Y\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "\n",
- "Enter name,age and basic salary:\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "GOPAL\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "19\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "6755.5\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Add another record(Y/N)\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "N\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "1.Add Records\n",
- "2.List Records\n",
- "3.Modify Records\n",
- "4.Delete Records\n",
- "0.Exit\n",
- "Your choice\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "2\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Suresh 24 1250.500000\t\t\t\t\t\t\t\t\t\t\n",
- "Ranjan 21 1300.600000\t\t\t\t\t\t\t\t\t\t\n",
- "Harish 28 1400.700000\t\t\t\t\t\t\t\t\t\t\n",
- "Ram 20 5000.000000\t\t\t\t\t\t\t\t\t\t\n",
- "GOPAL 19 6755.500000\t\t\t\t\t\t\t\t\t\t\n",
- "1.Add Records\n",
- "2.List Records\n",
- "3.Modify Records\n",
- "4.Delete Records\n",
- "0.Exit\n",
- "Your choice\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "3\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "\n",
- "Enter name of employee to modify\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Ram\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "\n",
- "Enter new name,age & bs\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Radhey\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "15\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "4687.66\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "\n",
- "Modify another Record(Y/N)\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "N\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "1.Add Records\n",
- "2.List Records\n",
- "3.Modify Records\n",
- "4.Delete Records\n",
- "0.Exit\n",
- "Your choice\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "2\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Suresh 24 1250.500000\t\t\t\t\t\t\t\t\t\t\n",
- "Ranjan 21 1300.600000\t\t\t\t\t\t\t\t\t\t\n",
- "Harish 28 1400.700000\t\t\t\t\t\t\t\t\t\t\n",
- "Radhey 15 4687.660000\t\t\t\t\t\t\t\t\t\t\n",
- "GOPAL 19 6755.500000\t\t\t\t\t\t\t\t\t\t\n",
- "1.Add Records\n",
- "2.List Records\n",
- "3.Modify Records\n",
- "4.Delete Records\n",
- "0.Exit\n",
- "Your choice\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "4\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "\n",
- "Enter name of employee to delete\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Radhey\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Delete another record(Y/N)\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "N\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "1.Add Records\n",
- "2.List Records\n",
- "3.Modify Records\n",
- "4.Delete Records\n",
- "0.Exit\n",
- "Your choice\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "2\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Suresh 24 1250.500000\t\t\t\t\t\t\t\t\t\t\n",
- "Ranjan 21 1300.600000\t\t\t\t\t\t\t\t\t\t\n",
- "Harish 28 1400.700000\t\t\t\t\t\t\t\t\t\t\n",
- "GOPAL 19 6755.500000\t\t\t\t\t\t\t\t\t\t\n",
- "1.Add Records\n",
- "2.List Records\n",
- "3.Modify Records\n",
- "4.Delete Records\n",
- "0.Exit\n",
- "Your choice\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "4\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "\n",
- "Enter name of employee to delete\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "GOPAL\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Delete another record(Y/N)\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "N\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "1.Add Records\n",
- "2.List Records\n",
- "3.Modify Records\n",
- "4.Delete Records\n",
- "0.Exit\n",
- "Your choice\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "2\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Suresh 24 1250.500000\t\t\t\t\t\t\t\t\t\t\n",
- "Ranjan 21 1300.600000\t\t\t\t\t\t\t\t\t\t\n",
- "Harish 28 1400.700000\t\t\t\t\t\t\t\t\t\t\n",
- "1.Add Records\n",
- "2.List Records\n",
- "3.Modify Records\n",
- "4.Delete Records\n",
- "0.Exit\n",
- "Your choice\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "0\n"
- ]
- },
- {
- "ename": "SystemExit",
- "evalue": "0",
- "output_type": "pyerr",
- "traceback": [
- "An exception has occurred, use %tb to see the full traceback.\n",
- "\u001b[1;31mSystemExit\u001b[0m\u001b[1;31m:\u001b[0m 0\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stderr",
- "text": [
- "To exit: use 'exit', 'quit', or Ctrl-D.\n"
- ]
- }
- ],
- "prompt_number": 23
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "EXAMPLE ON PAGE:416-417"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#File-copy program which copies text,.com and .exe files\n",
- "from StringIO import StringIO\n",
- "buffer = StringIO()\n",
- "print \"\\nEnter source file name\"\n",
- "source=raw_input()\n",
- "try:\n",
- " inhandle=open(source,'rb')\n",
- "except:\n",
- " print \"Cannot open file\"\n",
- "print \"Enter target file name\"\n",
- "target=raw_input()\n",
- "try:\n",
- " outhandle=open(target,'wb')\n",
- "except:\n",
- " print \"Cannot open file\"\n",
- " inhandle.close()\n",
- "bytes=inhandle.readlines()\n",
- "buffer.write(bytes)\n",
- "outhandle.writelines(buffer.getvalue())\n",
- "buffer.close()\n",
- "inhandle.close()\n",
- "outhandle.close()"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "\n",
- "Enter source file name\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "H4CK3R.txt\n"
- ]
- },
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Enter target file name\n"
- ]
- },
- {
- "name": "stdout",
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "python.txt\n"
- ]
- }
- ],
- "prompt_number": 24
- }
- ],
- "metadata": {}
- }
- ]
+{
+ "metadata": {
+ "name": "",
+ "signature": "sha256:a886cf212382fa732d2b3df088bbcba9a65ba4a31cbe899c80e912ac04c2747f"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "CHAPTER 12:FILE INPUT/OUTPUT"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "EXAMPLE ON PAGE:391"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ " \n",
+ "fp=open('PR1.txt','r') #open the file for reading\n",
+ "ch=fp.readlines() #ch will store all content of file\n",
+ "print \"%s\" % (' '.join(ch)) #prints content of file\n",
+ "print \"\\n\"\n",
+ "fp.close()"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "site:http://www.bzu.edu.pk/\n",
+ " user:siteuser@localhost\n",
+ " version:5.5.32-0ubuntu0.12.04.1\n",
+ " db: bzu\n",
+ " tables:\n",
+ " username:web,webadmin,webadministrator23\n",
+ " pass:71dc9f7af599450b23a3b5d54bc665c7,\t49fa1a081c8d5c8dcfa05d730803251a,\t*E8665C4049F515D836A3C8704D0543C6DA0FE96D\n",
+ "\n",
+ "\n"
+ ]
+ }
+ ],
+ "prompt_number": 8
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "EXAMPLE ON PAGE:394"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ " \n",
+ "try:\n",
+ " fp=open('yoyo.txt','r')\n",
+ " for line in fin:\n",
+ " print line\n",
+ " fp.close()\n",
+ "except:\n",
+ " print 'cannot open file'"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "cannot open file\n"
+ ]
+ }
+ ],
+ "prompt_number": 9
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "EXAMPLE ON PAGE:395"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ " \n",
+ "nol=0\n",
+ "nom=0\n",
+ "nob=0\n",
+ "noc=0\n",
+ "fp=open('H4CK3R.txt','r')\n",
+ "while True:\n",
+ " ch=fp.read(1)\n",
+ " if not ch:\n",
+ " break\n",
+ " noc+=1\n",
+ " if ch==' ':\n",
+ " nob+=1\n",
+ " if ch=='\\n':\n",
+ " nol+=1\n",
+ " if ch=='\\t':\n",
+ " nom+=1\n",
+ "fp.close()\n",
+ "print \"\\n\"\n",
+ "fp.close()\n",
+ "print \"Number of characters=%d\\n\" % (noc)\n",
+ "print \"Number of blanks=%d\\n\" % (nob)\n",
+ "print \"Number of tabs=%d\\n\" % (nom)\n",
+ "print \"Number of lines=%d\\n\" % (nol)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "\n",
+ "Number of characters=162\n",
+ "\n",
+ "Number of blanks=21\n",
+ "\n",
+ "Number of tabs=3\n",
+ "\n",
+ "Number of lines=4\n",
+ "\n"
+ ]
+ }
+ ],
+ "prompt_number": 10
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "EXAMPLE ON PAGE:396-397"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ " \n",
+ "import sys\n",
+ "try:\n",
+ " fs=open('H4CK3R.txt','r')\n",
+ "except:\n",
+ " print \"Cannot open file\"\n",
+ " sys.exit(1)\n",
+ "try:\n",
+ " ft=open('python.txt','w')\n",
+ "except:\n",
+ " print \"Cannot open file\"\n",
+ " fs.close()\n",
+ " sys.exit(2)\n",
+ "ch=fs.readlines()\n",
+ "ft.writelines(ch)\n",
+ "fs.close()\n",
+ "ft.close()"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [],
+ "prompt_number": 13
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "EXAMPLE ON PAGE:399"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ " \n",
+ "try:\n",
+ " fp=open('POEM.txt','w')\n",
+ "except:\n",
+ " print 'cannot open file'\n",
+ "print \"\\nEnter a few lines of text:\\n\"\n",
+ "s=' '\n",
+ "while (len(s)>0):\n",
+ " s=raw_input()\n",
+ " fp.writelines(s)\n",
+ " fp.writelines(\"\\n\")\n",
+ "fp.close()"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "Enter a few lines of text:\n",
+ "\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Shining and bright,they are forever,\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "so true about diamonds,\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "more so of memories,\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "especially yours!\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n"
+ ]
+ }
+ ],
+ "prompt_number": 15
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "EXAMPLE ON PAGE:400"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ " \n",
+ "try:\n",
+ " fp=open('POEM.txt','r')\n",
+ "except:\n",
+ " print 'cannot open file'\n",
+ "s=fp.read(99)\n",
+ "print \"%s\" % (s)\n",
+ "print \"\\n\"\n",
+ "fp.close()"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Shining and bright,they are forever,\n",
+ "so true about diamonds,\n",
+ "more so of memories,\n",
+ "especially yours!\n",
+ "\n",
+ "\n"
+ ]
+ }
+ ],
+ "prompt_number": 16
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "EXAMPLE ON PAGE:401-402"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ " \n",
+ "class emp():\n",
+ " def __init__(self,**kwds):\n",
+ " self.__dict__.update(kwds)\n",
+ "another='Y'\n",
+ "e=emp()\n",
+ "try:\n",
+ " fp=open('EMPLOYEE.txt','w')\n",
+ "except:\n",
+ " print 'cannot open file'\n",
+ "while another=='Y':\n",
+ " print \"\\nEnter name,age and basic salary:\"\n",
+ " e.name=raw_input()\n",
+ " e.age=eval(raw_input())\n",
+ " e.bs=eval(raw_input())\n",
+ " ch=\"%s %d %f\" % (e.name,e.age,e.bs)\n",
+ " fp.writelines(ch)\n",
+ " fp.writelines(\"\\n\")\n",
+ " print \"Add another record(Y/N)\"\n",
+ " another=raw_input()\n",
+ "fp.close()"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "Enter name,age and basic salary:\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Sunil\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "34\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "1250.50\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Add another record(Y/N)\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Y\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "Enter name,age and basic salary:\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Sameer\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "21\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "1300.50\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Add another record(Y/N)\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Y\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "Enter name,age and basic salary:\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Rahul\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "34\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "1400.55\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Add another record(Y/N)\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "n\n"
+ ]
+ }
+ ],
+ "prompt_number": 17
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "EXAMPLE ON PAGE:403-404"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ " \n",
+ "class emp():\n",
+ " def __init__(self,**kwds):\n",
+ " self.__dict__.update(kwds)\n",
+ "e=emp()\n",
+ "try:\n",
+ " fp=open('EMPLOYEE.txt','r') # open the file for reading\n",
+ "except:\n",
+ " print 'cannot open file'\n",
+ "for line in fp: # iterate over each line\n",
+ " e.name, e.age, e.bs = line.split() # split it by whitespace\n",
+ " e.age = int(e.age) # convert age from string to int\n",
+ " e.bs = float(e.bs) # convert bs from string to float\n",
+ " print \"%s %d %f\\n\" %(e.name, e.age, e.bs)\n",
+ "fp.close()"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Sunil 34 1250.500000\n",
+ "\n",
+ "Sameer 21 1300.500000\n",
+ "\n",
+ "Rahul 34 1400.550000\n",
+ "\n"
+ ]
+ }
+ ],
+ "prompt_number": 18
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "EXAMPLE ON PAGE:404-405"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ " \n",
+ "import sys #for exit()\n",
+ "try:\n",
+ " fs=open('H4CK3R.txt','rb') # open the file for reading\n",
+ "except:\n",
+ " print 'cannot open file'\n",
+ " sys.exit(1)\n",
+ "try:\n",
+ " ft=open('python.txt','wb') # open the file for writing\n",
+ "except:\n",
+ " print 'cannot open file'\n",
+ " fs.close()\n",
+ " sys.exit(2)\n",
+ "ch=fs.readlines()\n",
+ "ft.writelines(ch)\n",
+ "fs.close()\n",
+ "ft.close()"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [],
+ "prompt_number": 20
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "EXAMPLE ON PAGE:407-408"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ " \n",
+ "class emp():\n",
+ " def __init__(self,**kwds):\n",
+ " self.__dict__.update(kwds)\n",
+ "another='Y'\n",
+ "e=emp()\n",
+ "try:\n",
+ " fp=open('EMP.txt','wb') # open the file for reading\n",
+ "except:\n",
+ " print 'cannot open file' \n",
+ "while another=='Y':\n",
+ " print \"\\nEnter name,age and basic salary:\"\n",
+ " e.name=raw_input()\n",
+ " e.age=eval(raw_input())\n",
+ " e.bs=eval(raw_input())\n",
+ " ch=\"%s %d %f\" % (e.name,e.age,e.bs)\n",
+ " fp.writelines(ch)\n",
+ " print \"Add another record (Y/N)\"\n",
+ " another=raw_input()\n",
+ " if another=='Y':\n",
+ " fp.writelines(\"\\n\")\n",
+ "fp.close()"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "Enter name,age and basic salary:\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Suresh\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "24\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "1250.50\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Add another record (Y/N)\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Y\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "Enter name,age and basic salary:\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Ranjan\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "21\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "1300.60\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Add another record (Y/N)\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Y\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "Enter name,age and basic salary:\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Harish\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "28\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "1400.70\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Add another record (Y/N)\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "N\n"
+ ]
+ }
+ ],
+ "prompt_number": 21
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "EXAMPLE ON PAGE:409"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ " \n",
+ "class emp():\n",
+ " def __init__(self,**kwds):\n",
+ " self.__dict__.update(kwds)\n",
+ "e=emp()\n",
+ "try:\n",
+ " fp=open('EMP.txt','rb')\n",
+ "except:\n",
+ " print \"Cannot open file\"\n",
+ "for line in fp:\n",
+ " e.name, e.age, e.bs = line.split() # split it by whitespace\n",
+ " e.age = int(e.age) # convert age from string to int\n",
+ " e.bs = float(e.bs) # convert bs from string to float\n",
+ " print \"%s %d %f\\n\" %(e.name, e.age, e.bs)\n",
+ "fp.close()"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Suresh 24 1250.500000\n",
+ "\n",
+ "Ranjan 21 1300.600000\n",
+ "\n",
+ "Harish 28 1400.700000\n",
+ "\n"
+ ]
+ }
+ ],
+ "prompt_number": 22
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "EXAMPLE ON PAGE:411-414"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ " \n",
+ "class emp():\n",
+ " def __init__(self,**kwds):\n",
+ " self.__dict__.update(kwds)\n",
+ "e=emp()\n",
+ "try:\n",
+ " fp=open('EMP.txt','rb+') # open the file for reading\n",
+ "except:\n",
+ " try:\n",
+ " fp=open('EMP.txt','wb+') # open the file for writing\n",
+ " except:\n",
+ " print 'cannot open file'\n",
+ "while 1:\n",
+ " print \"1.Add Records\"\n",
+ " print \"2.List Records\"\n",
+ " print \"3.Modify Records\"\n",
+ " print \"4.Delete Records\"\n",
+ " print \"0.Exit\"\n",
+ " print \"Your choice\"\n",
+ " choice=eval(raw_input())\n",
+ " def add():\n",
+ " import os\n",
+ " fp.seek(0,os.SEEK_END)\n",
+ " another='Y'\n",
+ " while another=='Y':\n",
+ " print \"\\nEnter name,age and basic salary:\"\n",
+ " e.name=raw_input()\n",
+ " e.age=eval(raw_input())\n",
+ " e.bs=eval(raw_input())\n",
+ " ch=\"%s %d %f\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\" % (e.name,e.age,e.bs)\n",
+ " fp.writelines(\"\\n\")\n",
+ " fp.writelines(ch)\n",
+ " print \"Add another record(Y/N)\"\n",
+ " another=raw_input()\n",
+ " def list():\n",
+ " import os\n",
+ " fp.seek(0,os.SEEK_SET)\n",
+ " for line in fp: # iterate over each line\n",
+ " if len(line)>10:\n",
+ " e.name, e.age, e.bs = line.split() # split it by whitespace\n",
+ " e.age = int(e.age) # convert age from string to int\n",
+ " e.bs = float(e.bs) # convert bs from string to float\n",
+ " print \"%s %d %f\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\" %(e.name, e.age, e.bs)\n",
+ " def modify():\n",
+ " another='Y'\n",
+ " while another=='Y':\n",
+ " print \"\\nEnter name of employee to modify\"\n",
+ " empname=raw_input()\n",
+ " import os\n",
+ " fp.seek(0,os.SEEK_SET)\n",
+ " for line in iter(fp.readline, ''):\n",
+ " if len(line)>10:\n",
+ " e.name, e.age, e.bs=line.split()\n",
+ " e.age = int(e.age) # convert age from string to int\n",
+ " e.bs = float(e.bs)\n",
+ " if(cmp(e.name,empname)==0):\n",
+ " c=len(line)\n",
+ " print \"\\nEnter new name,age & bs\"\n",
+ " e.name=raw_input()\n",
+ " e.age=eval(raw_input())\n",
+ " e.bs=eval(raw_input())\n",
+ " import os\n",
+ " fp.seek(-c,os.SEEK_CUR)\n",
+ " ch=\"%s %d %f\" % (e.name,e.age,e.bs)\n",
+ " fp.writelines(\"\\n\")\n",
+ " fp.writelines(ch)\n",
+ " fp.writelines(\"\\n\")\n",
+ " break\n",
+ " print \"\\nModify another Record(Y/N)\"\n",
+ " another=raw_input()\n",
+ " def delete():\n",
+ " another='Y'\n",
+ " global fp\n",
+ " while another=='Y':\n",
+ " print \"\\nEnter name of employee to delete\"\n",
+ " empname=raw_input()\n",
+ " ft=open('TEMP.txt','wb')\n",
+ " import os\n",
+ " fp.seek(0,os.SEEK_SET)\n",
+ " for line in fp:\n",
+ " if len(line)>10:\n",
+ " e.name, e.age, e.bs=line.split()\n",
+ " e.age = int(e.age) # convert age from string to int\n",
+ " e.bs = float(e.bs)\n",
+ " if(cmp(e.name,empname)!=0):\n",
+ " ch=\"%s %d %f\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\" % (e.name,e.age,e.bs)\n",
+ " ft.writelines(ch)\n",
+ " ft.writelines(\"\\n\")\n",
+ " fp.close()\n",
+ " ft.close()\n",
+ " import os\n",
+ " os.remove(\"EMP.txt\") # Delete file EMP.txt\n",
+ " os.rename( \"TEMP.txt\", \"D:/EMP.txt\" ) # Rename a file from TEMP.txt to EMP.txt\n",
+ " fp=open('EMP.txt','rb+')\n",
+ " print \"Delete another record(Y/N)\"\n",
+ " another=raw_input()\n",
+ " def exit():\n",
+ " import sys\n",
+ " fp.close()\n",
+ " sys.exit(0)\n",
+ " def switch(c):\n",
+ " return {1: add,\n",
+ " 2: list,\n",
+ " 3: modify,\n",
+ " 4: delete,\n",
+ " 0: exit,\n",
+ " }[c]()\n",
+ " switch(choice)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "1.Add Records\n",
+ "2.List Records\n",
+ "3.Modify Records\n",
+ "4.Delete Records\n",
+ "0.Exit\n",
+ "Your choice\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "2\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Suresh 24 1250.500000\t\t\t\t\t\t\t\t\t\t\n",
+ "Ranjan 21 1300.600000\t\t\t\t\t\t\t\t\t\t\n",
+ "Harish 28 1400.700000\t\t\t\t\t\t\t\t\t\t\n",
+ "1.Add Records\n",
+ "2.List Records\n",
+ "3.Modify Records\n",
+ "4.Delete Records\n",
+ "0.Exit\n",
+ "Your choice\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "1\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "Enter name,age and basic salary:\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Ram\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "20\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "5000\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Add another record(Y/N)\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Y\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "Enter name,age and basic salary:\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "GOPAL\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "19\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "6755.5\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Add another record(Y/N)\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "N\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "1.Add Records\n",
+ "2.List Records\n",
+ "3.Modify Records\n",
+ "4.Delete Records\n",
+ "0.Exit\n",
+ "Your choice\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "2\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Suresh 24 1250.500000\t\t\t\t\t\t\t\t\t\t\n",
+ "Ranjan 21 1300.600000\t\t\t\t\t\t\t\t\t\t\n",
+ "Harish 28 1400.700000\t\t\t\t\t\t\t\t\t\t\n",
+ "Ram 20 5000.000000\t\t\t\t\t\t\t\t\t\t\n",
+ "GOPAL 19 6755.500000\t\t\t\t\t\t\t\t\t\t\n",
+ "1.Add Records\n",
+ "2.List Records\n",
+ "3.Modify Records\n",
+ "4.Delete Records\n",
+ "0.Exit\n",
+ "Your choice\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "3\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "Enter name of employee to modify\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Ram\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "Enter new name,age & bs\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Radhey\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "15\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "4687.66\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "Modify another Record(Y/N)\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "N\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "1.Add Records\n",
+ "2.List Records\n",
+ "3.Modify Records\n",
+ "4.Delete Records\n",
+ "0.Exit\n",
+ "Your choice\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "2\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Suresh 24 1250.500000\t\t\t\t\t\t\t\t\t\t\n",
+ "Ranjan 21 1300.600000\t\t\t\t\t\t\t\t\t\t\n",
+ "Harish 28 1400.700000\t\t\t\t\t\t\t\t\t\t\n",
+ "Radhey 15 4687.660000\t\t\t\t\t\t\t\t\t\t\n",
+ "GOPAL 19 6755.500000\t\t\t\t\t\t\t\t\t\t\n",
+ "1.Add Records\n",
+ "2.List Records\n",
+ "3.Modify Records\n",
+ "4.Delete Records\n",
+ "0.Exit\n",
+ "Your choice\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "4\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "Enter name of employee to delete\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Radhey\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Delete another record(Y/N)\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "N\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "1.Add Records\n",
+ "2.List Records\n",
+ "3.Modify Records\n",
+ "4.Delete Records\n",
+ "0.Exit\n",
+ "Your choice\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "2\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Suresh 24 1250.500000\t\t\t\t\t\t\t\t\t\t\n",
+ "Ranjan 21 1300.600000\t\t\t\t\t\t\t\t\t\t\n",
+ "Harish 28 1400.700000\t\t\t\t\t\t\t\t\t\t\n",
+ "GOPAL 19 6755.500000\t\t\t\t\t\t\t\t\t\t\n",
+ "1.Add Records\n",
+ "2.List Records\n",
+ "3.Modify Records\n",
+ "4.Delete Records\n",
+ "0.Exit\n",
+ "Your choice\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "4\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "Enter name of employee to delete\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "GOPAL\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Delete another record(Y/N)\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "N\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "1.Add Records\n",
+ "2.List Records\n",
+ "3.Modify Records\n",
+ "4.Delete Records\n",
+ "0.Exit\n",
+ "Your choice\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "2\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Suresh 24 1250.500000\t\t\t\t\t\t\t\t\t\t\n",
+ "Ranjan 21 1300.600000\t\t\t\t\t\t\t\t\t\t\n",
+ "Harish 28 1400.700000\t\t\t\t\t\t\t\t\t\t\n",
+ "1.Add Records\n",
+ "2.List Records\n",
+ "3.Modify Records\n",
+ "4.Delete Records\n",
+ "0.Exit\n",
+ "Your choice\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "0\n"
+ ]
+ },
+ {
+ "ename": "SystemExit",
+ "evalue": "0",
+ "output_type": "pyerr",
+ "traceback": [
+ "An exception has occurred, use %tb to see the full traceback.\n",
+ "\u001b[1;31mSystemExit\u001b[0m\u001b[1;31m:\u001b[0m 0\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stderr",
+ "text": [
+ "To exit: use 'exit', 'quit', or Ctrl-D.\n"
+ ]
+ }
+ ],
+ "prompt_number": 23
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "EXAMPLE ON PAGE:416-417"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ " \n",
+ "from StringIO import StringIO\n",
+ "buffer = StringIO()\n",
+ "print \"\\nEnter source file name\"\n",
+ "source=raw_input()\n",
+ "try:\n",
+ " inhandle=open(source,'rb')\n",
+ "except:\n",
+ " print \"Cannot open file\"\n",
+ "print \"Enter target file name\"\n",
+ "target=raw_input()\n",
+ "try:\n",
+ " outhandle=open(target,'wb')\n",
+ "except:\n",
+ " print \"Cannot open file\"\n",
+ " inhandle.close()\n",
+ "bytes=inhandle.readlines()\n",
+ "buffer.write(bytes)\n",
+ "outhandle.writelines(buffer.getvalue())\n",
+ "buffer.close()\n",
+ "inhandle.close()\n",
+ "outhandle.close()"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "Enter source file name\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "H4CK3R.txt\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter target file name\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "python.txt\n"
+ ]
+ }
+ ],
+ "prompt_number": 24
+ }
+ ],
+ "metadata": {}
+ }
+ ]
} \ No newline at end of file
generated by cgit (git 2.34.1) at 2024-12-20 14:19:42 +0000