|
| 1 | +{ |
| 2 | + "cells": [ |
| 3 | + { |
| 4 | + "cell_type": "markdown", |
| 5 | + "metadata": {}, |
| 6 | + "source": [ |
| 7 | + "<center><h1>Debugging in Python</h1></center><br><br>" |
| 8 | + ] |
| 9 | + }, |
| 10 | + { |
| 11 | + "cell_type": "markdown", |
| 12 | + "metadata": {}, |
| 13 | + "source": [ |
| 14 | + "<h3>raise statement :</h3>" |
| 15 | + ] |
| 16 | + }, |
| 17 | + { |
| 18 | + "cell_type": "code", |
| 19 | + "execution_count": null, |
| 20 | + "metadata": {}, |
| 21 | + "outputs": [], |
| 22 | + "source": [ |
| 23 | + "length = 0\n", |
| 24 | + "if(length == 0):\n", |
| 25 | + " raise Exception('This is an exception using raise statement. Length cannot be 0')" |
| 26 | + ] |
| 27 | + }, |
| 28 | + { |
| 29 | + "cell_type": "markdown", |
| 30 | + "metadata": {}, |
| 31 | + "source": [ |
| 32 | + "<br>" |
| 33 | + ] |
| 34 | + }, |
| 35 | + { |
| 36 | + "cell_type": "markdown", |
| 37 | + "metadata": {}, |
| 38 | + "source": [ |
| 39 | + "<h3>Getting Exception message as a string :</h3>\n", |
| 40 | + "Using <b>traceback</b> module..." |
| 41 | + ] |
| 42 | + }, |
| 43 | + { |
| 44 | + "cell_type": "code", |
| 45 | + "execution_count": 6, |
| 46 | + "metadata": {}, |
| 47 | + "outputs": [ |
| 48 | + { |
| 49 | + "name": "stdout", |
| 50 | + "output_type": "stream", |
| 51 | + "text": [ |
| 52 | + "Traceback (most recent call last):\n", |
| 53 | + " File \"<ipython-input-6-7677494f2f30>\", line 3, in <module>\n", |
| 54 | + " raise Exception('This is an Exception using raise statement')\n", |
| 55 | + "Exception: This is an Exception using raise statement\n", |
| 56 | + "\n", |
| 57 | + "From the file :\n", |
| 58 | + "Traceback (most recent call last):\n", |
| 59 | + " File \"<ipython-input-6-7677494f2f30>\", line 3, in <module>\n", |
| 60 | + " raise Exception('This is an Exception using raise statement')\n", |
| 61 | + "Exception: This is an Exception using raise statement\n", |
| 62 | + "\n" |
| 63 | + ] |
| 64 | + } |
| 65 | + ], |
| 66 | + "source": [ |
| 67 | + "import traceback\n", |
| 68 | + "try:\n", |
| 69 | + " raise Exception('This is an Exception using raise statement')\n", |
| 70 | + "except:\n", |
| 71 | + " print(traceback.format_exc())\n", |
| 72 | + " \n", |
| 73 | + " #Also writing the exception message to a file\n", |
| 74 | + " exceptionFile = open('exceptionFile.txt','a')\n", |
| 75 | + " exceptionFile.write(traceback.format_exc())\n", |
| 76 | + " exceptionFile.close()\n", |
| 77 | + " \n", |
| 78 | + " exceptionFile = open('exceptionFile.txt','r')\n", |
| 79 | + " exception = exceptionFile.read()\n", |
| 80 | + " print('From the file :')\n", |
| 81 | + " print(exception)" |
| 82 | + ] |
| 83 | + }, |
| 84 | + { |
| 85 | + "cell_type": "markdown", |
| 86 | + "metadata": {}, |
| 87 | + "source": [ |
| 88 | + "<h3>assert statement :</h3>" |
| 89 | + ] |
| 90 | + }, |
| 91 | + { |
| 92 | + "cell_type": "code", |
| 93 | + "execution_count": 3, |
| 94 | + "metadata": {}, |
| 95 | + "outputs": [ |
| 96 | + { |
| 97 | + "ename": "AssertionError", |
| 98 | + "evalue": "This is an exception using assert statement. Length cannot be 0", |
| 99 | + "output_type": "error", |
| 100 | + "traceback": [ |
| 101 | + "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m", |
| 102 | + "\u001b[0;31mAssertionError\u001b[0m Traceback (most recent call last)", |
| 103 | + "\u001b[0;32m<ipython-input-3-5ff61b4ac7e2>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[1;32m 1\u001b[0m \u001b[0mlength\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0;36m0\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 2\u001b[0;31m \u001b[0;32massert\u001b[0m \u001b[0mlength\u001b[0m \u001b[0;34m>\u001b[0m \u001b[0;36m0\u001b[0m\u001b[0;34m,\u001b[0m\u001b[0;34m'This is an exception using assert statement. Length cannot be 0'\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m", |
| 104 | + "\u001b[0;31mAssertionError\u001b[0m: This is an exception using assert statement. Length cannot be 0" |
| 105 | + ] |
| 106 | + } |
| 107 | + ], |
| 108 | + "source": [ |
| 109 | + "length = 0\n", |
| 110 | + "assert length > 0,'This is an exception using assert statement. Length cannot be 0'" |
| 111 | + ] |
| 112 | + }, |
| 113 | + { |
| 114 | + "cell_type": "markdown", |
| 115 | + "metadata": {}, |
| 116 | + "source": [ |
| 117 | + "<br>" |
| 118 | + ] |
| 119 | + }, |
| 120 | + { |
| 121 | + "cell_type": "markdown", |
| 122 | + "metadata": {}, |
| 123 | + "source": [ |
| 124 | + "<h3>Logging :</h3>\n", |
| 125 | + "Using <b>logging</b> module..." |
| 126 | + ] |
| 127 | + }, |
| 128 | + { |
| 129 | + "cell_type": "markdown", |
| 130 | + "metadata": {}, |
| 131 | + "source": [ |
| 132 | + "There are 5 levels of logs :\n", |
| 133 | + "<ul>\n", |
| 134 | + " <li>debug</li>\n", |
| 135 | + " <li>info</li>\n", |
| 136 | + " <li>warning</li>\n", |
| 137 | + " <li>error</li>\n", |
| 138 | + " <li>critical</li>\n", |
| 139 | + "</ul>\n", |
| 140 | + "They are in increasing priority." |
| 141 | + ] |
| 142 | + }, |
| 143 | + { |
| 144 | + "cell_type": "code", |
| 145 | + "execution_count": 8, |
| 146 | + "metadata": {}, |
| 147 | + "outputs": [ |
| 148 | + { |
| 149 | + "name": "stderr", |
| 150 | + "output_type": "stream", |
| 151 | + "text": [ |
| 152 | + "2018-07-18 00:31:50,119 - DEBUG - Start of program...\n", |
| 153 | + "2018-07-18 00:31:50,124 - DEBUG - Start of factorial(5)...\n", |
| 154 | + "2018-07-18 00:31:50,125 - DEBUG - i = 5 and total = 1...\n", |
| 155 | + "2018-07-18 00:31:50,126 - DEBUG - i = 5 and total = 2...\n", |
| 156 | + "2018-07-18 00:31:50,129 - DEBUG - i = 5 and total = 6...\n", |
| 157 | + "2018-07-18 00:31:50,130 - DEBUG - i = 5 and total = 24...\n", |
| 158 | + "2018-07-18 00:31:50,130 - DEBUG - i = 5 and total = 120...\n", |
| 159 | + "2018-07-18 00:31:50,131 - DEBUG - Return value is 120...\n", |
| 160 | + "2018-07-18 00:31:50,132 - DEBUG - End of program...\n" |
| 161 | + ] |
| 162 | + }, |
| 163 | + { |
| 164 | + "name": "stdout", |
| 165 | + "output_type": "stream", |
| 166 | + "text": [ |
| 167 | + "120\n" |
| 168 | + ] |
| 169 | + } |
| 170 | + ], |
| 171 | + "source": [ |
| 172 | + "import logging\n", |
| 173 | + "#logging configuration line\n", |
| 174 | + "logging.basicConfig(level = logging.DEBUG, format = '%(asctime)s - %(levelname)s - %(message)s')\n", |
| 175 | + "\n", |
| 176 | + "logging.debug('Start of program...')\n", |
| 177 | + "#logging.info('Start of program...')\n", |
| 178 | + "#logging.warning('Start of program...')\n", |
| 179 | + "#logging.error('Start of program...')\n", |
| 180 | + "#logging.critical('Start of program...')\n", |
| 181 | + "\n", |
| 182 | + "def factorial(number):\n", |
| 183 | + " logging.debug('Start of factorial(%s)...' %(number))\n", |
| 184 | + " total = 1\n", |
| 185 | + " for i in range(1, number + 1):\n", |
| 186 | + " total *= i\n", |
| 187 | + " logging.debug('i = %s and total = %s...' %(number, total))\n", |
| 188 | + " \n", |
| 189 | + " logging.debug('Return value is %s...' %(total))\n", |
| 190 | + " return total\n", |
| 191 | + " \n", |
| 192 | + "print(factorial(5))\n", |
| 193 | + "\n", |
| 194 | + "logging.debug('End of program...')\n", |
| 195 | + " " |
| 196 | + ] |
| 197 | + }, |
| 198 | + { |
| 199 | + "cell_type": "markdown", |
| 200 | + "metadata": {}, |
| 201 | + "source": [ |
| 202 | + "<b>To disable all the logging commands :</b> " |
| 203 | + ] |
| 204 | + }, |
| 205 | + { |
| 206 | + "cell_type": "code", |
| 207 | + "execution_count": 10, |
| 208 | + "metadata": {}, |
| 209 | + "outputs": [], |
| 210 | + "source": [ |
| 211 | + "#critical to disablea log of all priorities\n", |
| 212 | + "logging.disable(logging.CRITICAL)" |
| 213 | + ] |
| 214 | + }, |
| 215 | + { |
| 216 | + "cell_type": "markdown", |
| 217 | + "metadata": {}, |
| 218 | + "source": [ |
| 219 | + "<b>To save all the logs to a file :</b>" |
| 220 | + ] |
| 221 | + }, |
| 222 | + { |
| 223 | + "cell_type": "code", |
| 224 | + "execution_count": 12, |
| 225 | + "metadata": {}, |
| 226 | + "outputs": [ |
| 227 | + { |
| 228 | + "name": "stdout", |
| 229 | + "output_type": "stream", |
| 230 | + "text": [ |
| 231 | + "120\n" |
| 232 | + ] |
| 233 | + } |
| 234 | + ], |
| 235 | + "source": [ |
| 236 | + "import logging\n", |
| 237 | + "#logging configuration line\n", |
| 238 | + "#The filename argument sends all the logs to the file specified\n", |
| 239 | + "logging.basicConfig(filename = 'logs.txt', level = logging.DEBUG, format = '%(asctime)s - %(levelname)s - %(message)s')\n", |
| 240 | + "\n", |
| 241 | + "logging.debug('Start of program...')\n", |
| 242 | + "#logging.info('Start of program...')\n", |
| 243 | + "#logging.warning('Start of program...')\n", |
| 244 | + "#logging.error('Start of program...')\n", |
| 245 | + "#logging.critical('Start of program...')\n", |
| 246 | + "\n", |
| 247 | + "def factorial(number):\n", |
| 248 | + " logging.debug('Start of factorial(%s)...' %(number))\n", |
| 249 | + " total = 1\n", |
| 250 | + " for i in range(1, number + 1):\n", |
| 251 | + " total *= i\n", |
| 252 | + " logging.debug('i = %s and total = %s...' %(number, total))\n", |
| 253 | + " \n", |
| 254 | + " logging.debug('Return value is %s...' %(total))\n", |
| 255 | + " return total\n", |
| 256 | + " \n", |
| 257 | + "print(factorial(5))\n", |
| 258 | + "\n", |
| 259 | + "logging.debug('End of program...')" |
| 260 | + ] |
| 261 | + }, |
| 262 | + { |
| 263 | + "cell_type": "code", |
| 264 | + "execution_count": null, |
| 265 | + "metadata": {}, |
| 266 | + "outputs": [], |
| 267 | + "source": [] |
| 268 | + } |
| 269 | + ], |
| 270 | + "metadata": { |
| 271 | + "kernelspec": { |
| 272 | + "display_name": "Python 3", |
| 273 | + "language": "python", |
| 274 | + "name": "python3" |
| 275 | + }, |
| 276 | + "language_info": { |
| 277 | + "codemirror_mode": { |
| 278 | + "name": "ipython", |
| 279 | + "version": 3 |
| 280 | + }, |
| 281 | + "file_extension": ".py", |
| 282 | + "mimetype": "text/x-python", |
| 283 | + "name": "python", |
| 284 | + "nbconvert_exporter": "python", |
| 285 | + "pygments_lexer": "ipython3", |
| 286 | + "version": "3.6.5" |
| 287 | + } |
| 288 | + }, |
| 289 | + "nbformat": 4, |
| 290 | + "nbformat_minor": 2 |
| 291 | +} |
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