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{
"metadata": {
"name": "Chapter 15"
},
"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": "# Example 15.1.py\n# A database program to look up names in a hardcoded list\n\n\n# Function declaration\ndef 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\nname = 'John'\n\nif (lookup (name)) :\n print ('%s is in the list\\n' % name)\nelse :\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": "# Example 15.6.py\n# To count the number of 3's and 7's in an array\n\n\n# Variable and function declaration\nseven_count = 0\nthree_count = 0\ndata = []\n\ndef get_data (data) :\n for i in range (0, 5) :\n x = 3\n data.append(int(x))\n print (data)\n\n# Calculation\nget_data (data)\nfor 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\nprint ('Threes %d Sevens %d' % (three_count, seven_count))",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "[3, 3, 3, 3, 3]\nThrees 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": "# Example 15.7.py\n# To perform binary search on a number in a file 'numbers.dat'\n\n\n# Variable declaration\nimport sys\nimport os\nin_file = open ('numbers.dat', 'r')\n\ndata = []\nmax_count = 0\n \n# Calculation and result\nif not os.path.exists ('numbers.dat') :\n print ('Error:Unable to open numbers.dat\\n')\n sys.exit(1)\n\nfor line in in_file :\n data.append(line)\n max_count += 1\n\nwhile (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\nin_file.close()",
"language": "python",
"metadata": {},
"outputs": [
{
"ename": "IOError",
"evalue": "[Errno 2] No such file or directory: 'numbers.dat'",
"output_type": "pyerr",
"traceback": [
"\u001b[1;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[1;31mIOError\u001b[0m Traceback (most recent call last)",
"\u001b[1;32m<ipython-input-5-ce867c3a4ec5>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[0;32m 6\u001b[0m \u001b[1;32mimport\u001b[0m \u001b[0msys\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m 7\u001b[0m \u001b[1;32mimport\u001b[0m \u001b[0mos\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 8\u001b[1;33m \u001b[0min_file\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mopen\u001b[0m \u001b[1;33m(\u001b[0m\u001b[1;34m'numbers.dat'\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;34m'r'\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m 9\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m 10\u001b[0m \u001b[0mdata\u001b[0m \u001b[1;33m=\u001b[0m \u001b[1;33m[\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
"\u001b[1;31mIOError\u001b[0m: [Errno 2] No such file or directory: 'numbers.dat'"
]
}
],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": "Example 15.8, Page number: 300"
},
{
"cell_type": "code",
"collapsed": false,
"input": "# Example 15.8.py\n# To perform binary search on a number in a file 'numbers.dat'\n\n\n# Variable declaration\nimport sys\nimport os\nin_file = open ('numbers.dat', 'r')\n\ndata = []\nmax_count = 0\n \n# Calculation and result\nif not os.path.exists ('numbers.dat') :\n print ('Error:Unable to open numbers.dat\\n')\n sys.exit(1)\n\nfor line in in_file :\n data.append(line)\n max_count += 1\n\nwhile (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\nin_file.close()",
"language": "python",
"metadata": {},
"outputs": [
{
"ename": "IOError",
"evalue": "[Errno 2] No such file or directory: 'numbers.dat'",
"output_type": "pyerr",
"traceback": [
"\u001b[1;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[1;31mIOError\u001b[0m Traceback (most recent call last)",
"\u001b[1;32m<ipython-input-6-8cd3b79f72a3>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[0;32m 6\u001b[0m \u001b[1;32mimport\u001b[0m \u001b[0msys\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m 7\u001b[0m \u001b[1;32mimport\u001b[0m \u001b[0mos\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 8\u001b[1;33m \u001b[0min_file\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mopen\u001b[0m \u001b[1;33m(\u001b[0m\u001b[1;34m'numbers.dat'\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;34m'r'\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m 9\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m 10\u001b[0m \u001b[0mdata\u001b[0m \u001b[1;33m=\u001b[0m \u001b[1;33m[\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
"\u001b[1;31mIOError\u001b[0m: [Errno 2] No such file or directory: 'numbers.dat'"
]
}
],
"prompt_number": 6
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": "Example 15.10, Page number: 304"
},
{
"cell_type": "code",
"collapsed": false,
"input": "# Example 15.10.py\n# To illustrate divide by zero error\n\n\n# Variable declaration\ni = 1\nj = 0\n\n# Calculation and result\nprint ('Starting\\n')\nprint ('Before divide...')\ni = i / j\nprint ('After\\n')",
"language": "python",
"metadata": {},
"outputs": [
{
"ename": "ZeroDivisionError",
"evalue": "integer division or modulo by zero",
"output_type": "pyerr",
"traceback": [
"\u001b[1;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[1;31mZeroDivisionError\u001b[0m Traceback (most recent call last)",
"\u001b[1;32m<ipython-input-7-289ff2a55d4d>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[0;32m 10\u001b[0m \u001b[1;32mprint\u001b[0m \u001b[1;33m(\u001b[0m\u001b[1;34m'Starting\\n'\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m 11\u001b[0m \u001b[1;32mprint\u001b[0m \u001b[1;33m(\u001b[0m\u001b[1;34m'Before divide...'\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m---> 12\u001b[1;33m \u001b[0mi\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mi\u001b[0m \u001b[1;33m/\u001b[0m \u001b[0mj\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m 13\u001b[0m \u001b[1;32mprint\u001b[0m \u001b[1;33m(\u001b[0m\u001b[1;34m'After\\n'\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
"\u001b[1;31mZeroDivisionError\u001b[0m: integer division or modulo by zero"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": "Starting\n\nBefore divide...\n"
}
],
"prompt_number": 7
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": "Example 15.11, Page number: 304"
},
{
"cell_type": "code",
"collapsed": false,
"input": "# Example 15.11.py\n# To illustrate divide by zero error with flush() function\n\n\n# Variable declaration\nimport sys\ni = 1\nj = 0\n\n# Calculation and result\nprint ('Starting\\n')\nsys.stdout.flush()\nprint ('Before divide...')\nsys.stdout.flush()\ni = i / j\nprint ('After\\n')\nsys.stdout.flush()",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Starting\n\n"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "Before divide...\n"
},
{
"ename": "ZeroDivisionError",
"evalue": "integer division or modulo by zero",
"output_type": "pyerr",
"traceback": [
"\u001b[1;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[1;31mZeroDivisionError\u001b[0m Traceback (most recent call last)",
"\u001b[1;32m<ipython-input-8-eedd2fda3e82>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[0;32m 13\u001b[0m \u001b[1;32mprint\u001b[0m \u001b[1;33m(\u001b[0m\u001b[1;34m'Before divide...'\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m 14\u001b[0m \u001b[0msys\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mstdout\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mflush\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m---> 15\u001b[1;33m \u001b[0mi\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mi\u001b[0m \u001b[1;33m/\u001b[0m \u001b[0mj\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m 16\u001b[0m \u001b[1;32mprint\u001b[0m \u001b[1;33m(\u001b[0m\u001b[1;34m'After\\n'\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m 17\u001b[0m \u001b[0msys\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mstdout\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mflush\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
"\u001b[1;31mZeroDivisionError\u001b[0m: integer division or modulo by zero"
]
}
],
"prompt_number": 8
}
],
"metadata": {}
}
]
}
|
