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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": [
{
"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": [
"\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": [
{
"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": [
"\n",
"# Variable declaration\n",
"i = 1\n",
"j = 0\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": [
{
"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",
"\n",
"Before divide...\n"
]
}
],
"prompt_number": 7
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": [
"Example 15.11, Page number: 304"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"# Variable declaration\n",
"import sys\n",
"i = 1\n",
"j = 0\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"
]
},
{
"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": {}
}
]
}
|
