10.Exceptions.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "import sys"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "x = ['a', 0, 2]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['a', 0, 2]"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "x"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "The entry is a\n",
      "Oops! <class 'ValueError'> occured.\n",
      "Next entry.\n",
      "\n",
      "The entry is 0\n",
      "Oops! <class 'ZeroDivisionError'> occured.\n",
      "Next entry.\n",
      "\n",
      "The entry is 2\n",
      "The reciprocal of 2 is 0.5\n"
     ]
    }
   ],
   "source": [
    "for entry in x:\n",
    "    try:\n",
    "        print(\"The entry is\", entry)\n",
    "        r = 1/int(entry)\n",
    "        break\n",
    "    except:\n",
    "        print(\"Oops!\",sys.exc_info()[0],\"occured.\")\n",
    "        print(\"Next entry.\")\n",
    "        print()\n",
    "print(\"The reciprocal of\",entry,\"is\",r)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "ename": "KeyboardInterrupt",
     "evalue": "",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mKeyboardInterrupt\u001b[0m                         Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-5-c761920b81b0>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0;32mraise\u001b[0m \u001b[0mKeyboardInterrupt\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[0;31mKeyboardInterrupt\u001b[0m: "
     ]
    }
   ],
   "source": [
    "raise KeyboardInterrupt"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "ename": "MemoryError",
     "evalue": "This is an argument",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mMemoryError\u001b[0m                               Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-6-51782e52f201>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0;32mraise\u001b[0m \u001b[0mMemoryError\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"This is an argument\"\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[0;31mMemoryError\u001b[0m: This is an argument"
     ]
    }
   ],
   "source": [
    "raise MemoryError(\"This is an argument\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Enter a positive integer: 3.0\n",
      "invalid literal for int() with base 10: '3.0'\n"
     ]
    }
   ],
   "source": [
    "try:\n",
    "    a = int(input(\"Enter a positive integer: \"))\n",
    "    if a <= 0:\n",
    "        raise ValueError(\"That is not a positive number!\")\n",
    "except ValueError as ve:\n",
    "            print(ve)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Enter a positive integer: 5\n"
     ]
    }
   ],
   "source": [
    "try:\n",
    "    a = int(input(\"Enter a positive integer: \"))\n",
    "    if a <= 0:\n",
    "        raise ValueError(\"That is not a positive number!\")\n",
    "except ValueError as ve:\n",
    "            print(ve)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [],
   "source": [
    "    try:\n",
    "       f = open(\"test.txt\",encoding = 'utf-8')\n",
    "       # perform file operations\n",
    "    finally:\n",
    "       f.close()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Second element = 2\n",
      "An error occurred\n"
     ]
    }
   ],
   "source": [
    "a = [1, 2, 3] \n",
    "try:\n",
    "    print(\"Second element = %d\" %(a[1]) )\n",
    "    print(\"Fourth element = %d\" %(a[3]) )\n",
    "except IndexError: \n",
    "    print(\"An error occurred\")\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "\n",
      "Error Occurred and Handled\n"
     ]
    }
   ],
   "source": [
    "try :\n",
    "    a = 3\n",
    "    if a < 4 : \n",
    "        b = a/(a-3)\n",
    "        print(\"Value of b = \", b )\n",
    "\n",
    "except(ZeroDivisionError, NameError):\n",
    "    print(\"\\nError Occurred and Handled\")\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [],
   "source": [
    "def funb(a , b): \n",
    "    try:\n",
    "        c = ((a+b) / (a-b)) \n",
    "    except ZeroDivisionError:\n",
    "        print(\"a/b result in 0\")\n",
    "    else:\n",
    "        print(c)\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "-5.0\n"
     ]
    }
   ],
   "source": [
    "funb(2.0, 3.0)  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "a/b result in 0\n"
     ]
    }
   ],
   "source": [
    "funb(3.0, 3.0)  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "An exception\n"
     ]
    },
    {
     "ename": "NameError",
     "evalue": "Hi there",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mNameError\u001b[0m                                 Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-15-d3e1cb263964>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[1;32m      1\u001b[0m \u001b[0;32mtry\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 2\u001b[0;31m     \u001b[0;32mraise\u001b[0m \u001b[0mNameError\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"Hi there\"\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m      3\u001b[0m \u001b[0;32mexcept\u001b[0m \u001b[0mNameError\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m      4\u001b[0m         \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"An exception\"\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m      5\u001b[0m         \u001b[0;32mraise\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
      "\u001b[0;31mNameError\u001b[0m: Hi there"
     ]
    }
   ],
   "source": [
    "try:\n",
    "    raise NameError(\"Hi there\") \n",
    "except NameError:\n",
    "        print(\"An exception\")\n",
    "        raise"
   ]
  }
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