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+{
+ "metadata": {
+ "name": "",
+ "signature": "sha256:23b3891085deb8af52412d44380b6187a4110d7e026531ec90b3b2ae79d61d0f"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "Chapter 15: Debugging and optimization"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 3,
+ "metadata": {},
+ "source": [
+ "Example 15.1, Page number: 275"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\n",
+ "# Function declaration\n",
+ "def lookup (name) :\n",
+ " lists = ['John', 'Jim', 'Jane', 'Clyde']\n",
+ " result = 0\n",
+ "\n",
+ " for index in range (0, 4) :\n",
+ " if (lists[index] == name) :\n",
+ " result = 1\n",
+ " break\n",
+ " \n",
+ " return result\n",
+ "\n",
+ "# Calculation and result\n",
+ "name = 'John'\n",
+ "\n",
+ "if (lookup (name)) :\n",
+ " print ('%s is in the list\\n' % name)\n",
+ "else :\n",
+ " print ('%s is not in the list\\n' % name)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "John is in the list\n",
+ "\n"
+ ]
+ }
+ ],
+ "prompt_number": 2
+ },
+ {
+ "cell_type": "heading",
+ "level": 3,
+ "metadata": {},
+ "source": [
+ "Example 15.6, Page number: 288"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\n",
+ "# Variable and function declaration\n",
+ "seven_count = 0\n",
+ "three_count = 0\n",
+ "data = []\n",
+ "\n",
+ "def get_data (data) :\n",
+ " for i in range (0, 5) :\n",
+ " x = 3\n",
+ " data.append(int(x))\n",
+ " print (data)\n",
+ "\n",
+ "# Calculation\n",
+ "get_data (data)\n",
+ "for index in range (0, 5) :\n",
+ " if data[index] == 3 :\n",
+ " three_count += 1\n",
+ "\n",
+ " if data[index] == 7 :\n",
+ " seven_count += 1\n",
+ "\n",
+ "# Result\n",
+ "print ('Threes %d Sevens %d' % (three_count, seven_count))"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "[3, 3, 3, 3, 3]\n",
+ "Threes 5 Sevens 0\n"
+ ]
+ }
+ ],
+ "prompt_number": 4
+ },
+ {
+ "cell_type": "heading",
+ "level": 3,
+ "metadata": {},
+ "source": [
+ "Example 15.7, Page number: 292"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\n",
+ "# Variable declaration\n",
+ "import sys\n",
+ "import os\n",
+ "in_file = open ('numbers.dat', 'r')\n",
+ "\n",
+ "data = []\n",
+ "max_count = 0\n",
+ " \n",
+ "# Calculation and result\n",
+ "if not os.path.exists ('numbers.dat') :\n",
+ " print ('Error:Unable to open numbers.dat\\n')\n",
+ " sys.exit(1)\n",
+ "\n",
+ "for line in in_file :\n",
+ " data.append(line)\n",
+ " max_count += 1\n",
+ "\n",
+ "while (1) :\n",
+ " search = 6\n",
+ " \n",
+ " if (search == -1) :\n",
+ " break\n",
+ "\n",
+ " low = 0\n",
+ " high = max_count\n",
+ "\n",
+ " while (1) :\n",
+ " mid = (low + high) / 2\n",
+ " middle = int (mid) \n",
+ "\n",
+ " if (int (data[middle]) == search) :\n",
+ " print ('Found at index %d\\n' % (middle + 1))\n",
+ " break\n",
+ "\n",
+ " if (low == high) :\n",
+ " print ('Not found\\n')\n",
+ " break\n",
+ "\n",
+ " if (int (data[middle]) < search) :\n",
+ " low = middle\n",
+ " else :\n",
+ " high = middle \n",
+ "\n",
+ "in_file.close()"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [],
+ "prompt_number": "*"
+ },
+ {
+ "cell_type": "heading",
+ "level": 3,
+ "metadata": {},
+ "source": [
+ "Example 15.8, Page number: 300"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\n",
+ "\n",
+ "# Variable declaration\n",
+ "import sys\n",
+ "import os\n",
+ "in_file = open ('numbers.dat', 'r')\n",
+ "\n",
+ "data = []\n",
+ "max_count = 0\n",
+ " \n",
+ "# Calculation and result\n",
+ "if not os.path.exists ('numbers.dat') :\n",
+ " print ('Error:Unable to open numbers.dat\\n')\n",
+ " sys.exit(1)\n",
+ "\n",
+ "for line in in_file :\n",
+ " data.append(line)\n",
+ " max_count += 1\n",
+ "\n",
+ "while (1) :\n",
+ " search = 14\n",
+ " \n",
+ " if (search == -1) :\n",
+ " break\n",
+ "\n",
+ " low = 0\n",
+ " high = max_count\n",
+ "\n",
+ " while (1) :\n",
+ " mid = (low + high) / 2\n",
+ " middle = int (mid) \n",
+ "\n",
+ " if (int (data[middle]) == search) :\n",
+ " print ('Found at index %d\\n' % (middle + 1))\n",
+ " break\n",
+ "\n",
+ " if (low == high) :\n",
+ " print ('Not found\\n')\n",
+ " break\n",
+ "\n",
+ " if (int (data[middle]) < search) :\n",
+ " low = middle\n",
+ " else :\n",
+ " high = middle \n",
+ "\n",
+ "in_file.close()"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [],
+ "prompt_number": "*"
+ },
+ {
+ "cell_type": "heading",
+ "level": 3,
+ "metadata": {},
+ "source": [
+ "Example 15.10, Page number: 304"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\n",
+ "# Variable declaration\n",
+ "i = 1\n",
+ "j = 1\n",
+ "\n",
+ "# Calculation and result\n",
+ "print ('Starting\\n')\n",
+ "print ('Before divide...')\n",
+ "i = i / j\n",
+ "print ('After\\n')"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Starting\n",
+ "\n",
+ "Before divide...\n",
+ "After\n",
+ "\n"
+ ]
+ }
+ ],
+ "prompt_number": 9
+ },
+ {
+ "cell_type": "heading",
+ "level": 3,
+ "metadata": {},
+ "source": [
+ "Example 15.11, Page number: 304"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "from __future__ import division\n",
+ "# Variable declaration\n",
+ "import sys\n",
+ "i = 1\n",
+ "j = 1\n",
+ "\n",
+ "# Calculation and result\n",
+ "print ('Starting\\n')\n",
+ "sys.stdout.flush()\n",
+ "print ('Before divide...')\n",
+ "sys.stdout.flush()\n",
+ "i = i / j\n",
+ "print ('After\\n')\n",
+ "sys.stdout.flush()"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Starting\n",
+ "\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Before divide...\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "After\n",
+ "\n"
+ ]
+ }
+ ],
+ "prompt_number": 8
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [],
+ "language": "python",
+ "metadata": {},
+ "outputs": []
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+} \ No newline at end of file
generated by cgit (git 2.34.1) at 2025-03-12 02:26:54 +0000