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+{
+ "metadata": {
+  "name": "Chapter 18"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 18: Debugging Programs"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 3,
+     "metadata": {},
+     "source": [
+      "Program 18.1, Page number: 389"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#18.1.py\n",
+      "#Adding Debug statements in program\n",
+      "\n",
+      "#Program logs will be saved in file- 18.1_logFile.txt\n",
+      "\n",
+      "#Import library\n",
+      "import logging\n",
+      "\n",
+      "#Function to return sum of 3 numbers\n",
+      "def process(i,j,k):\n",
+      "        return i+j+k\n",
+      "\n",
+      "#Main()\n",
+      "def main():\n",
+      "\n",
+      "        logger = logging.getLogger()\n",
+      "        logger.setLevel(logging.DEBUG)\n",
+      "\n",
+      "        formatter = logging.Formatter('%(asctime)s - %(levelname)s - %(message)s')\n",
+      "\n",
+      "        fh = logging.FileHandler('18.1_logFile.txt')\n",
+      "        fh.setLevel(logging.DEBUG)\n",
+      "        fh.setFormatter(formatter)\n",
+      "        logger.addHandler(fh)\n",
+      "\n",
+      "        ch = logging.StreamHandler()\n",
+      "        ch.setLevel(logging.DEBUG)\n",
+      "        ch.setFormatter(formatter)\n",
+      "        logger.addHandler(ch)\n",
+      "\n",
+      "        arr=[]\n",
+      "        arr=map(int,\"1 2 3\".split())\n",
+      "        #arr=map(int,raw_input().split())\n",
+      "        logger.debug(\"Number of integers read= {0}\".format(len(arr)))               #Debug statement\n",
+      "        logger.debug(\"i = {0}, j = {1}, k = {2}\\n\".format(arr[0],arr[1],arr[2]))    #Debug statement\n",
+      "\n",
+      "        print(\"sum= %i\\n\"%process(arr[0],arr[1],arr[2]))\n",
+      "\n",
+      "\n",
+      "#Setting top level conditional script\n",
+      "if __name__=='__main__':\n",
+      "        main()\n",
+      "\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stderr",
+       "text": [
+        "2013-08-27 01:20:39,300 - DEBUG - Number of integers read= 3\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stderr",
+       "text": [
+        "2013-08-27 01:20:39,303 - DEBUG - i = 1, j = 2, k = 3\n",
+        "\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "sum= 6\n",
+        "\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 3,
+     "metadata": {},
+     "source": [
+      "Program 18.2, Page number: 391"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#18.2.py\n",
+      "#Compiling in Debug \n",
+      "\n",
+      "#Program logs will be saved in file- 18.2_logFile.txt\n",
+      "\n",
+      "#Import Libraries\n",
+      "import logging,sys\n",
+      "\n",
+      "#Function to return product of two numbers\n",
+      "def process(i1,i2):\n",
+      "\n",
+      "        global logger \n",
+      "        logger.debug(\"process (%i, %i)\\n\"%(i1, i2))\n",
+      "        val=i1*i2\n",
+      "        logger.debug(\"return %i\\n\"%(val))\n",
+      "        return val\n",
+      "\n",
+      "\n",
+      "#Main()\n",
+      "def main():\n",
+      "\n",
+      "        global logger\n",
+      "        logging.basicConfig(filename='18.2_logFile.txt', filemode='w', level=logging.DEBUG)\n",
+      "        logger = logging.getLogger()\n",
+      "        logger.setLevel(logging.DEBUG)\n",
+      "        filemode = 'w'\n",
+      "        \n",
+      "        formatter = logging.Formatter('%(asctime)s - %(levelname)s - %(message)s')\n",
+      "\n",
+      "        fh = logging.FileHandler('18.2_logFile.txt')\n",
+      "        fh.setLevel(logging.DEBUG)\n",
+      "        fh.setFormatter(formatter)\n",
+      "        logger.addHandler(fh)\n",
+      "\n",
+      "        ch = logging.StreamHandler()\n",
+      "        ch.setLevel(logging.DEBUG)\n",
+      "        ch.setFormatter(formatter)\n",
+      "        logger.addHandler(ch)\n",
+      "\n",
+      "\n",
+      "        arg1=0\n",
+      "        arg2=0\n",
+      "        #Un-Comment this while executing from terminal/command line\n",
+      "        #if(len(sys.argv)>1):\n",
+      "                #arg1=int(sys.argv[1])\n",
+      "        #if(len(sys.argv)==3):\n",
+      "                #arg2=int(sys.argv[2])\n",
+      "\n",
+      "        #Dummy command-line-parameters\n",
+      "        #execute as \"python <filename>.py arg1 arg2\" while executing from terminal and un/comment respective statements\n",
+      "        a=['3','5']                                      \n",
+      "        logger.debug(\"processed %i arguments\\n\"%(len(a)))\n",
+      "        #logger.debug(\"processed %i arguments\\n\"%(len(sys.argv)))\n",
+      "\n",
+      "        logger.debug(\"arg1 = %i, arg2 = %i\\n\"%(int(a[0]), int(a[1])))\n",
+      "        print(\"product = %i\\n\" %( process (int(a[0]),int( a[1]))))\n",
+      "\n",
+      "        #logger.debug(\"arg1 = %i, arg2 = %i\\n\"%(arg1, arg2))\n",
+      "        #print(\"product = %i\\n\" %( process (arg1, arg2)))\n",
+      "\n",
+      "\n",
+      "#Setting top level conditional script\n",
+      "if __name__=='__main__':\n",
+      "        main()\n",
+      "\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stderr",
+       "text": [
+        "2013-08-27 17:50:53,392 - DEBUG - processed 2 arguments\n",
+        "\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stderr",
+       "text": [
+        "2013-08-27 17:50:53,397 - DEBUG - arg1 = 3, arg2 = 5\n",
+        "\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stderr",
+       "text": [
+        "2013-08-27 17:50:53,404 - DEBUG - process (3, 5)\n",
+        "\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stderr",
+       "text": [
+        "2013-08-27 17:50:53,409 - DEBUG - return 15\n",
+        "\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "product = 15\n",
+        "\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 3,
+     "metadata": {},
+     "source": [
+      "Program 18.3, Page number: 393"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#18.3.py\n",
+      "#Compiling in Debug--version2\n",
+      "\n",
+      "#Program logs will be saved in file- 18.3_logFile.txt\n",
+      "\n",
+      "#Using different logging levels\n",
+      "#DEBUG          Detailed information, typically of interest only when diagnosing problems.\n",
+      "#INFO           Confirmation that things are working as expected.\n",
+      "#WARNING        An indication of some problem in the near future (e.g.'disk space low')\n",
+      "#ERROR          Due to a more serious problem, the software has not been able to perform some function.\n",
+      "#CRITICAL       A serious error, indicating that the program itself may be unable to continue running.\n",
+      "\n",
+      "\n",
+      "#Import Libraries\n",
+      "import logging,sys\n",
+      "\n",
+      "#Function to return product of two numbers\n",
+      "def process(i1,i2):\n",
+      "\n",
+      "        global logger \n",
+      "        logger.warning(\"process (%i, %i)\\n\"%(i1, i2))\n",
+      "        val=i1*i2\n",
+      "        logger.error(\"return %i\\n\"%(val))\n",
+      "        return val\n",
+      "\n",
+      "\n",
+      "#Main()\n",
+      "def main():\n",
+      "\n",
+      "        global logger\n",
+      "        logging.basicConfig(filename='18.3_logFile.txt', filemode='w', level=logging.DEBUG)\n",
+      "        logger = logging.getLogger()\n",
+      "        logger.setLevel(logging.DEBUG)\n",
+      "\n",
+      "        formatter = logging.Formatter('%(asctime)s - %(levelname)s - %(message)s')\n",
+      "\n",
+      "        fh = logging.FileHandler('18.3_logFile.txt')\n",
+      "        fh.setLevel(logging.DEBUG)\n",
+      "        fh.setFormatter(formatter)\n",
+      "        logger.addHandler(fh)\n",
+      "\n",
+      "        ch = logging.StreamHandler()\n",
+      "        ch.setLevel(logging.DEBUG)\n",
+      "        ch.setFormatter(formatter)\n",
+      "        logger.addHandler(ch)\n",
+      "\n",
+      "\n",
+      "        arg1=0\n",
+      "        arg2=0\n",
+      "        #Un-Comment this while executing from terminal/command line\n",
+      "\n",
+      "        #if(len(sys.argv)>1):\n",
+      "                #arg1=int(sys.argv[1])\n",
+      "        #if(len(sys.argv)==3):\n",
+      "                #arg2=int(sys.argv[2])\n",
+      "\n",
+      "        #Dummy command-line-parameters\n",
+      "        #execute as \"python <filename>.py arg1 arg2\" while executing from terminal and un/comment respective statements\n",
+      "        a=['3','5']\n",
+      "        logger.debug(\"processed %i arguments\\n\"%(len(a)))\n",
+      "        #logger.debug(\"processed %i arguments\\n\"%(len(sys.argv)))\n",
+      "\n",
+      "        logger.info(\"arg1 = %i, arg2 = %i\\n\"%(int(a[0]), int(a[1])))\n",
+      "        print(\"product = %i\\n\" %( process (int(a[0]),int( a[1]))))\n",
+      "\n",
+      "        #logger.debug(\"arg1 = %i, arg2 = %i\\n\"%(arg1, arg2))\n",
+      "        #print(\"product = %i\\n\" %( process (arg1, arg2)))\n",
+      "\n",
+      "\n",
+      "#Setting top level conditional script\n",
+      "if __name__=='__main__':\n",
+      "        main()\n",
+      "\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stderr",
+       "text": [
+        "2013-08-27 17:54:41,136 - DEBUG - processed 2 arguments\n",
+        "\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stderr",
+       "text": [
+        "2013-08-27 17:54:41,142 - INFO - arg1 = 3, arg2 = 5\n",
+        "\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stderr",
+       "text": [
+        "2013-08-27 17:54:41,149 - WARNING - process (3, 5)\n",
+        "\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stderr",
+       "text": [
+        "2013-08-27 17:54:41,154 - ERROR - return 15\n",
+        "\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "product = 15\n",
+        "\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 3,
+     "metadata": {},
+     "source": [
+      "Program 18.4, Page number: 396"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#18.4.py\n",
+      "#A simple program for use with pdb(gdb like python debugger)\n",
+      "\n",
+      "#Main()\n",
+      "def main():\n",
+      "        \n",
+      "        #Variable Declaration\n",
+      "        sum=0\n",
+      "        data = [1, 2, 3, 4, 5]\n",
+      "\n",
+      "        #Calculation\n",
+      "        for i in range (0,5):\n",
+      "                sum += data[i]\n",
+      "        \n",
+      "        #Result\n",
+      "        print(\"sum = %i\\n\"%(sum))\n",
+      "        \n",
+      "\n",
+      "#Setting top level conditional script\n",
+      "if __name__=='__main__':\n",
+      "        main()\n",
+      "\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "sum = 15\n",
+        "\n"
+       ]
+      }
+     ],
+     "prompt_number": 4
+    },
+    {
+     "cell_type": "heading",
+     "level": 3,
+     "metadata": {},
+     "source": [
+      "Program 18.5, Page number: 401"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#18.5.py\n",
+      "#Working more with pdb\n",
+      "\n",
+      "#Class Declaration\n",
+      "class date:\n",
+      "        def __init__(self,m,d,y):               #Class constructor\n",
+      "                self.month=m\n",
+      "                self.day=d\n",
+      "                self.year=y\n",
+      "\n",
+      "        def foo(x):\n",
+      "                x.day+=1\n",
+      "                return x\n",
+      "\n",
+      "#Main()\n",
+      "def main():\n",
+      "\n",
+      "        #Variable Declaration\n",
+      "        today=date(10,11,2004)\n",
+      "        array=[1,2,3,4,5]\n",
+      "        string=\"test string\"\n",
+      "        i=3\n",
+      "        newdate=date(11,15,2004)\n",
+      "        today=date.foo(today)\n",
+      "\n",
+      "        #Result\n",
+      "        print(\"today= %d/%d/%d\"%(today.day,today.month,today.year))\n",
+      "\n",
+      "\n",
+      "#Setting top level conditional script\n",
+      "if __name__=='__main__':\n",
+      "        main()\n",
+      "\n",
+      "\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "today= 12/10/2004\n"
+       ]
+      }
+     ],
+     "prompt_number": 5
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
\ No newline at end of file