DAI-Lab 6 (File and exception handling).ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "a86b8b45",
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   "source": [
    "# Exceptions"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "1b8e33da",
   "metadata": {},
   "source": [
    "## 1.Exceptions"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "44e99740",
   "metadata": {},
   "source": [
    "### An exception is a kind of error that terminates the excution of program."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "aac245e0",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "age : b\n"
     ]
    },
    {
     "ename": "ValueError",
     "evalue": "invalid literal for int() with base 10: 'b'",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mValueError\u001b[0m                                Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-3-469d52f39f6d>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mage\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0minput\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"age : \"\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[0;31mValueError\u001b[0m: invalid literal for int() with base 10: 'b'"
     ]
    }
   ],
   "source": [
    "age = int(input(\"age : \"))"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "c21df4b5",
   "metadata": {},
   "source": [
    "## 2.Handling Exceptions"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "id": "05690c0b",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "enter the num1\n",
      "1\n",
      "enter the num2\n",
      "b\n"
     ]
    },
    {
     "ename": "ValueError",
     "evalue": "invalid literal for int() with base 10: 'b'",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mValueError\u001b[0m                                Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-6-f8522020a269>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[1;32m      2\u001b[0m \u001b[0mnum1\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0minput\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m      3\u001b[0m \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"enter the num2\"\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 4\u001b[0;31m \u001b[0mnum2\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0minput\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\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      5\u001b[0m \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"the sum of num1 and num2 is\"\u001b[0m\u001b[0;34m,\u001b[0m\u001b[0mnum1\u001b[0m\u001b[0;34m+\u001b[0m\u001b[0mnum2\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m      6\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n",
      "\u001b[0;31mValueError\u001b[0m: invalid literal for int() with base 10: 'b'"
     ]
    }
   ],
   "source": [
    "print(\"enter the num1\")\n",
    "num1 = int(input())\n",
    "print(\"enter the num2\")\n",
    "num2 = int(input())\n",
    "print(\"the sum of num1 and num2 is\",num1+num2)\n",
    "\n",
    "\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "id": "3dabad48",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "enter the num1\n",
      "1\n",
      "enter the num2\n",
      "b\n"
     ]
    },
    {
     "ename": "ValueError",
     "evalue": "invalid literal for int() with base 10: 'b'",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mValueError\u001b[0m                                Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-8-95cb86fae98f>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[1;32m      3\u001b[0m \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"enter the num2\"\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[0mnum2\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0minput\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 5\u001b[0;31m \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"the sum of num1 and num2 is\"\u001b[0m\u001b[0;34m,\u001b[0m\u001b[0mint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mnum1\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m+\u001b[0m\u001b[0mint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mnum2\u001b[0m\u001b[0;34m)\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      6\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m      7\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n",
      "\u001b[0;31mValueError\u001b[0m: invalid literal for int() with base 10: 'b'"
     ]
    }
   ],
   "source": [
    "print(\"enter the num1\")\n",
    "num1 = input()\n",
    "print(\"enter the num2\")\n",
    "num2 = input()\n",
    "print(\"the sum of num1 and num2 is\",int(num1)+int(num2))\n",
    "\n",
    "\n",
    "print(\"this line is important\")\n",
    "\n",
    "\n",
    "\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 27,
   "id": "d95faebb",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "enter the num1\n",
      "1\n",
      "enter the num2\n",
      "re\n",
      "invalid literal for int() with base 10: 're'\n",
      "this line is very important\n"
     ]
    }
   ],
   "source": [
    "print(\"enter the num1\")\n",
    "num1 = input()\n",
    "print(\"enter the num2\")\n",
    "num2 = input()\n",
    "\n",
    "try:\n",
    "    print(\"the sum of num1 and num2 is\",int(num1)+int(num2))\n",
    "    \n",
    "except Exception as error:\n",
    "    print(error)\n",
    "    \n",
    "print(\"this line is very important\")\n",
    "    "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "id": "f5d8a8b8",
   "metadata": {
    "scrolled": true
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "age: re\n"
     ]
    },
    {
     "ename": "ValueError",
     "evalue": "invalid literal for int() with base 10: 're'",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mValueError\u001b[0m                                Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-13-0780201e7639>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mage\u001b[0m  \u001b[0;34m=\u001b[0m \u001b[0mint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0minput\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"age: \"\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[0;31mValueError\u001b[0m: invalid literal for int() with base 10: 're'"
     ]
    }
   ],
   "source": [
    "age  = int(input(\"age: \"))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 29,
   "id": "53ff3a2d",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "age: re\n",
      "u did not enter a valid age\n",
      "this line is very important\n"
     ]
    }
   ],
   "source": [
    "try:\n",
    "    age = int(input(\"age: \"))\n",
    "except:\n",
    "    #print(\"Error--\",error)\n",
    "    print(\"u did not enter a valid age\")\n",
    "else:\n",
    "    print(\"no exception were thrown\")\n",
    "    \n",
    "    \n",
    "print(\"this line is very important\")\n",
    "    "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 32,
   "id": "bbee6b9b",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "age: 3\n",
      "no exception were thrown\n",
      "this line is very important\n"
     ]
    }
   ],
   "source": [
    "try:\n",
    "    age = int(input(\"age: \"))\n",
    "except Exception as error:\n",
    "    print(\"error:-\",error)\n",
    "else:\n",
    "    print(\"no exception were thrown\")\n",
    "    \n",
    "    \n",
    "print(\"this line is very important\")"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "5c316b35",
   "metadata": {},
   "source": [
    "## 3.Cleaning Up"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 31,
   "id": "cb038d4c",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "age: 23\n",
      "no exception were thrown\n"
     ]
    }
   ],
   "source": [
    "try:\n",
    "    file = open(\"python for beginner 6.ipynb\")\n",
    "    age = int(input(\"age: \"))\n",
    "except Exception as error:\n",
    "    print(\"error:-\",error)\n",
    "else:\n",
    "    print(\"no exception were thrown\")\n",
    "    \n",
    "finally:\n",
    "    file.close()"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "c418ad44",
   "metadata": {},
   "source": []
  }
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