{
"metadata": {
"name": "",
"signature": "sha256:5b64344dd4b10e210167de1e2d127d9539461b4485363c51a2c3ddba9df7db38"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 13: Managing Errors & Exceptions"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"example 13.1, page no. 231"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\"\"\"\n",
"there is no need of semicolon. We will show error for something else\n",
"\"\"\"\n",
"\n",
"print \"Hello Python...\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Hello Python...\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"example 13.2, page no. 232"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"a = 10\n",
"b = 5\n",
"c = 5\n",
"x = a/(b-c) #It will show ZeroDivisionError\n",
"print \"x = \", x\n",
"y = a/(b+c)\n",
"print \"y = \", y"
],
"language": "python",
"metadata": {},
"outputs": [
{
"ename": "ZeroDivisionError",
"evalue": "division by zero",
"output_type": "pyerr",
"traceback": [
"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[0;31mZeroDivisionError\u001b[0m Traceback (most recent call last)",
"\u001b[0;32m<ipython-input-5-9289236a4a07>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[1;32m 3\u001b[0m \u001b[0mb\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0;36m5\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m 4\u001b[0m \u001b[0mc\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0;36m5\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 5\u001b[0;31m \u001b[0mx\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0ma\u001b[0m\u001b[0;34m/\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mb\u001b[0m\u001b[0;34m-\u001b[0m\u001b[0mc\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m 6\u001b[0m \u001b[0;32mprint\u001b[0m \u001b[0;34m\"x = \"\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mx\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m 7\u001b[0m \u001b[0my\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0ma\u001b[0m\u001b[0;34m/\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mb\u001b[0m\u001b[0;34m+\u001b[0m\u001b[0mc\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
"\u001b[0;31mZeroDivisionError\u001b[0m: division by zero"
]
}
],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 13.3 page no : 235"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"a = 10\n",
"b = 5\n",
"c = 5\n",
"try:\n",
" x = a/(b-c)\n",
"except Exception,e :\n",
" print \"Division by zero\"\n",
"y = a/(b+c)\n",
"print \"y = \",y"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Division by zero\n",
"y = 1\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 13.4 page no : 236"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"import sys\n",
"invalid = 0\n",
"count = 0\n",
"for i in sys.argv:\n",
" try:\n",
" a = int(i)\n",
" except:\n",
" invalid += 1\n",
" print \"Invalid number\" , i\n",
" continue\n",
" count += 1\n",
"\n",
"print \"Valid Numbers : \" ,count\n",
"print \"Invalid numbers \",invalid\n",
" "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Invalid number -c\n",
"Invalid number -f\n",
"Invalid number /tmp/tmp1tOqar/profile_default/security/kernel-082ebfe6-5650-4ba4-8bcf-cd17bc99af7a.json\n",
"Invalid number --IPKernelApp.parent_appname='ipython-notebook'\n",
"Invalid number --profile-dir\n",
"Invalid number /tmp/tmp1tOqar/profile_default\n",
"Invalid number --parent=1\n",
"Valid Numbers : 0\n",
"Invalid numbers 7\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"example 13.5, page no. 239"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"a = [5,10]\n",
"b = 5\n",
"try:\n",
" x = a[2]/b - a[1]\n",
"except AssertionError:\n",
" print \"AssertionError:\"\n",
"except IndexError:\n",
" print \"Array Index Error\"\n",
"except Exception:\n",
" print \"Any Error\"\n",
"y = a[1]/a[0]\n",
"print \"y = \" , y "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Array Index Error\n",
"y = 2\n"
]
}
],
"prompt_number": 6
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 13.6 page no : 239"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"x = 5\n",
"y = 1000\n",
"\n",
"class MyException(Exception):\n",
" def __init__(self, message):\n",
" Exception.__init__(self, message)\n",
" def error(self):\n",
" print self.message\n",
"\n",
"try:\n",
" z = x/y\n",
" if(z<0.01):\n",
" raise MyException(\"Number is too small\")\n",
"except MyException, error:\n",
" print \"Caught MyException\"\n",
" print error.message\n",
"finally:\n",
" print \"I am always here\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Caught MyException\n",
"Number is too small\n",
"I am always here\n"
]
}
],
"prompt_number": 8
}
],
"metadata": {}
}
]
}