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+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 13: The Preprocessor and Debugging"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Program 13.2, page no. 576"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\"\"\"\n",
+      "Demonstrating assertions\n",
+      "\"\"\"\n",
+      "\n",
+      "y = 5\n",
+      "for x in range(20):\n",
+      "    print \"x = %d y = %d\" %(x, y)\n",
+      "    assert(x < y)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "ename": "AssertionError",
+       "evalue": "",
+       "output_type": "pyerr",
+       "traceback": [
+        "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[1;31mAssertionError\u001b[0m                            Traceback (most recent call last)",
+        "\u001b[1;32m<ipython-input-1-3bb87684a82b>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[0;32m      6\u001b[0m \u001b[1;32mfor\u001b[0m \u001b[0mx\u001b[0m \u001b[1;32min\u001b[0m \u001b[0mrange\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;36m20\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      7\u001b[0m     \u001b[1;32mprint\u001b[0m \u001b[1;34m\"x = %d y = %d\"\u001b[0m \u001b[1;33m%\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mx\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0my\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 8\u001b[1;33m     \u001b[1;32massert\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mx\u001b[0m \u001b[1;33m<\u001b[0m \u001b[0my\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
+        "\u001b[1;31mAssertionError\u001b[0m: "
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "x = 0 y = 5\n",
+        "x = 1 y = 5\n",
+        "x = 2 y = 5\n",
+        "x = 3 y = 5\n",
+        "x = 4 y = 5\n",
+        "x = 5 y = 5\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Program 13.3, page no. 578"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\"\"\"\n",
+      "Test our timer function\n",
+      "\"\"\"\n",
+      "\n",
+      "import time\n",
+      "import datetime\n",
+      "import math\n",
+      "\n",
+      "calendar_start = datetime.datetime.now()\n",
+      "cpu_start = time.time()\n",
+      "count = 0\n",
+      "iterations = 1000000\n",
+      "answer = 'y'\n",
+      "x = 0.0\n",
+      "print \"Initial clock time = \", cpu_start, \" Initial calendar time = \", calendar_start\n",
+      "while(answer.lower() == 'y'):\n",
+      "    for i in range(iterations):\n",
+      "        x = math.sqrt(3.14159265)\n",
+      "    count += 1\n",
+      "    print \"%d square roots completed.\\n\" %(iterations*count)\n",
+      "    print \"Do you want to run some more(y or n)? \"\n",
+      "    answer = raw_input()\n",
+      "\n",
+      "cpu_end = time.time()\n",
+      "calendar_end = datetime.datetime.now()\n",
+      "\n",
+      "\n",
+      "print \"Final clock time = \", cpu_end, \" Final calendar time = \", calendar_end\n",
+      "print \"CPU time for %d iterations is %.2f seconds\" %(count*iterations, (float(cpu_end-cpu_start)/time.clock()))\n",
+      "print \"Elapsed calendar time to execute the program is\", calendar_end-calendar_start, \" seconds\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Initial clock time =  1387828819.12  Initial calendar time =  2013-12-24 01:30:19.115309\n",
+        "1000000 square roots completed.\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "\n",
+        "Do you want to run some more(y or n)? \n"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "y\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "2000000 square roots completed.\n",
+        "\n",
+        "Do you want to run some more(y or n)? \n"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "n\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Final clock time =  1387828824.23  Final calendar time =  2013-12-24 01:30:24.232139\n",
+        "CPU time for 2000000 iterations is 4.49 seconds\n",
+        "Elapsed calendar time to execute the program is 0:00:05.116830  seconds\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Program 13.4, page no. 583"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\"\"\"\n",
+      "Getting date data with ease\n",
+      "\"\"\"\n",
+      "\n",
+      "from datetime import *\n",
+      "import time\n",
+      "\n",
+      "day = [\"Monday\", \"Tuesday\", \"Wednesday\", \"Thursday\", \"Friday\", \"Saturday\", \"Sunday\"]\n",
+      "month = [\"January\", \"February\", \"March\", \"April\", \"May\", \"June\", \"July\", \"August\",\n",
+      "         \"September\", \"October\", \"November\", \"December\"]\n",
+      "         \n",
+      "now = datetime.now()\n",
+      "suffix = \"\"\n",
+      "\n",
+      "today = day[datetime.today().weekday()]\n",
+      "curr_month = month[now.month-1]\n",
+      "\n",
+      "if now.day == 1 or now.day == 21 or now.day == 31:\n",
+      "    suffix= \"st\"\n",
+      "elif now.day == 2 or now.day == 22:\n",
+      "    suffix= \"nd\"\n",
+      "elif now.day == 3 or now.day == 23:\n",
+      "    suffix = \"rd\"\n",
+      "else:\n",
+      "    suffix= \"th\"\n",
+      "    \n",
+      "print \"Today is \", today, \" the \",str(now.day)+suffix, curr_month, str(now.year)+\".\", \"The time is \", time.strftime(\"%H:%M:%S\")"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Today is  Tuesday  the  24th December 2013. The time is  01:30:43\n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Program 13.5, page no. 586"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\"\"\"\n",
+      "Getting the day for a given date\n",
+      "\"\"\"\n",
+      "\n",
+      "from datetime import *\n",
+      "import time\n",
+      "\n",
+      "day = [\"Monday\", \"Tuesday\", \"Wednesday\", \"Thursday\", \"Friday\", \"Saturday\", \"Sunday\"]\n",
+      "month = [\"January\", \"February\", \"March\", \"April\", \"May\", \"June\", \"July\", \"August\",\n",
+      "         \"September\", \"October\", \"November\", \"December\"]\n",
+      "         \n",
+      "now = datetime.now()\n",
+      "suffix = \"\"\n",
+      "\n",
+      "curr_month = month[now.month-1]\n",
+      "\n",
+      "print \"Enter a name: \",\n",
+      "name = raw_input()\n",
+      "print \"Enter a DOB for \", name\n",
+      "dob_day = int(raw_input(\"Day: \"))\n",
+      "dob_month = int(raw_input(\"Month: \"))\n",
+      "dob_year = int(raw_input(\"Year: \"))\n",
+      "dob_date = date(dob_year, dob_month, dob_day)\n",
+      "\n",
+      "if dob_day == 1 or dob_day == 21 or dob_day == 31:\n",
+      "    suffix= \"st\"\n",
+      "elif dob_day == 2 or dob_day == 22:\n",
+      "    suffix= \"nd\"\n",
+      "elif dob_day == 3 or dob_day == 23:\n",
+      "    suffix = \"rd\"\n",
+      "else:\n",
+      "    suffix= \"th\"\n",
+      "\n",
+      "dob_month = month[dob_month-1]\n",
+      "print name, \"Was born on \", str(dob_day)+suffix, dob_month, dob_year, \"which was a \", day[date.weekday(dob_date)]"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter a name: "
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Ricky\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " Enter a DOB for  Ricky\n"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Day: 5\n"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Month: 8\n"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Year: 1970\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Ricky Was born on  5th August 1970 which was a  Wednesday\n"
+       ]
+      }
+     ],
+     "prompt_number": 4
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
\ No newline at end of file