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‎Chapter10-Debugging/Debugging_In_Python.ipynb‎

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{
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"cells": [
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"<center><h1>Debugging in Python</h1></center><br><br>"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"<h3>raise statement :</h3>"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"length = 0\n",
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"if(length == 0):\n",
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" raise Exception('This is an exception using raise statement. Length cannot be 0')"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"<br>"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"<h3>Getting Exception message as a string :</h3>\n",
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"Using <b>traceback</b> module..."
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]
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},
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{
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"cell_type": "code",
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"execution_count": 6,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"Traceback (most recent call last):\n",
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" File \"<ipython-input-6-7677494f2f30>\", line 3, in <module>\n",
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" raise Exception('This is an Exception using raise statement')\n",
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"Exception: This is an Exception using raise statement\n",
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"\n",
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"From the file :\n",
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"Traceback (most recent call last):\n",
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" File \"<ipython-input-6-7677494f2f30>\", line 3, in <module>\n",
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" raise Exception('This is an Exception using raise statement')\n",
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"Exception: This is an Exception using raise statement\n",
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"\n"
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]
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}
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],
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"source": [
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"import traceback\n",
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"try:\n",
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" raise Exception('This is an Exception using raise statement')\n",
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"except:\n",
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" print(traceback.format_exc())\n",
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" \n",
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" #Also writing the exception message to a file\n",
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" exceptionFile = open('exceptionFile.txt','a')\n",
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" exceptionFile.write(traceback.format_exc())\n",
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" exceptionFile.close()\n",
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" \n",
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" exceptionFile = open('exceptionFile.txt','r')\n",
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" exception = exceptionFile.read()\n",
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" print('From the file :')\n",
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" print(exception)"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"<h3>assert statement :</h3>"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 3,
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"metadata": {},
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"outputs": [
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{
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"ename": "AssertionError",
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"evalue": "This is an exception using assert statement. Length cannot be 0",
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"output_type": "error",
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"traceback": [
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"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
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"\u001b[0;31mAssertionError\u001b[0m Traceback (most recent call last)",
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"\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",
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"\u001b[0;31mAssertionError\u001b[0m: This is an exception using assert statement. Length cannot be 0"
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]
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}
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],
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"source": [
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"length = 0\n",
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"assert length > 0,'This is an exception using assert statement. Length cannot be 0'"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"<br>"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"<h3>Logging :</h3>\n",
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"Using <b>logging</b> module..."
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"There are 5 levels of logs :\n",
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"<ul>\n",
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" <li>debug</li>\n",
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" <li>info</li>\n",
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" <li>warning</li>\n",
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" <li>error</li>\n",
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" <li>critical</li>\n",
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"</ul>\n",
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"They are in increasing priority."
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]
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},
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{
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"cell_type": "code",
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"execution_count": 8,
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"metadata": {},
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"outputs": [
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{
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"name": "stderr",
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"output_type": "stream",
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"text": [
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"2018-07-18 00:31:50,119 - DEBUG - Start of program...\n",
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"2018-07-18 00:31:50,124 - DEBUG - Start of factorial(5)...\n",
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"2018-07-18 00:31:50,125 - DEBUG - i = 5 and total = 1...\n",
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"2018-07-18 00:31:50,126 - DEBUG - i = 5 and total = 2...\n",
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"2018-07-18 00:31:50,129 - DEBUG - i = 5 and total = 6...\n",
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"2018-07-18 00:31:50,130 - DEBUG - i = 5 and total = 24...\n",
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"2018-07-18 00:31:50,130 - DEBUG - i = 5 and total = 120...\n",
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"2018-07-18 00:31:50,131 - DEBUG - Return value is 120...\n",
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"2018-07-18 00:31:50,132 - DEBUG - End of program...\n"
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]
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},
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"120\n"
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]
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}
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],
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"source": [
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"import logging\n",
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"#logging configuration line\n",
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"logging.basicConfig(level = logging.DEBUG, format = '%(asctime)s - %(levelname)s - %(message)s')\n",
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"\n",
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"logging.debug('Start of program...')\n",
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"#logging.info('Start of program...')\n",
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"#logging.warning('Start of program...')\n",
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"#logging.error('Start of program...')\n",
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"#logging.critical('Start of program...')\n",
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"\n",
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"def factorial(number):\n",
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" logging.debug('Start of factorial(%s)...' %(number))\n",
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" total = 1\n",
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" for i in range(1, number + 1):\n",
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" total *= i\n",
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" logging.debug('i = %s and total = %s...' %(number, total))\n",
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" \n",
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" logging.debug('Return value is %s...' %(total))\n",
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" return total\n",
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" \n",
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"print(factorial(5))\n",
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"\n",
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"logging.debug('End of program...')\n",
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" "
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"<b>To disable all the logging commands :</b> "
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]
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},
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{
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"cell_type": "code",
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"execution_count": 10,
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"metadata": {},
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"outputs": [],
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"source": [
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"#critical to disablea log of all priorities\n",
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"logging.disable(logging.CRITICAL)"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"<b>To save all the logs to a file :</b>"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 12,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"120\n"
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]
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}
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],
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"source": [
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"import logging\n",
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"#logging configuration line\n",
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"#The filename argument sends all the logs to the file specified\n",
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"logging.basicConfig(filename = 'logs.txt', level = logging.DEBUG, format = '%(asctime)s - %(levelname)s - %(message)s')\n",
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"\n",
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"logging.debug('Start of program...')\n",
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"#logging.info('Start of program...')\n",
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"#logging.warning('Start of program...')\n",
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"#logging.error('Start of program...')\n",
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"#logging.critical('Start of program...')\n",
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"\n",
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"def factorial(number):\n",
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" logging.debug('Start of factorial(%s)...' %(number))\n",
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" total = 1\n",
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" for i in range(1, number + 1):\n",
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" total *= i\n",
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" logging.debug('i = %s and total = %s...' %(number, total))\n",
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" \n",
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" logging.debug('Return value is %s...' %(total))\n",
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" return total\n",
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" \n",
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"print(factorial(5))\n",
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"\n",
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"logging.debug('End of program...')"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": []
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "Python 3",
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"language": "python",
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"name": "python3"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 3
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython3",
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"version": "3.6.5"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 2
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}

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