Class10 (Error Handling).ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Link to explore Types of Error:\n",
    "https://www.tutorialspoint.com/python/python_exceptions.htm"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Common Types of Error"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Pakistan\n",
      "Pakistan\n"
     ]
    },
    {
     "ename": "ZeroDivisionError",
     "evalue": "division by zero",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mZeroDivisionError\u001b[0m                         Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-1-7cbd99db5245>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[1;32m      2\u001b[0m \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"Pakistan\"\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[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 4\u001b[0;31m \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m \u001b[0;36m7\u001b[0m \u001b[0;34m/\u001b[0m \u001b[0;36m0\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[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m      6\u001b[0m \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"Pakistan\"\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
      "\u001b[0;31mZeroDivisionError\u001b[0m: division by zero"
     ]
    }
   ],
   "source": [
    "print(\"Pakistan\")\n",
    "print(\"Pakistan\")\n",
    "\n",
    "print( 7 / 0 )\n",
    "\n",
    "print(\"Pakistan\")\n",
    "print(\"Pakistan\")\n",
    "print(\"Pakistan\")\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "ename": "NameError",
     "evalue": "name 'a' is not defined",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mNameError\u001b[0m                                 Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-2-bca0e2660b9f>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0ma\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[0;31mNameError\u001b[0m: name 'a' is not defined"
     ]
    }
   ],
   "source": [
    "print(a)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "ename": "IndexError",
     "evalue": "list index out of range",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mIndexError\u001b[0m                                Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-3-910e382c8105>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[1;32m      1\u001b[0m \u001b[0ma\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0;34m[\u001b[0m\u001b[0;36m2\u001b[0m\u001b[0;34m,\u001b[0m\u001b[0;36m3\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m      2\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 3\u001b[0;31m \u001b[0ma\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;36m7\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[0;31mIndexError\u001b[0m: list index out of range"
     ]
    }
   ],
   "source": [
    "a = [2,3]\n",
    "\n",
    "a[7]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "ename": "KeyError",
     "evalue": "'z'",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mKeyError\u001b[0m                                  Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-4-dd58e4962b20>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[1;32m      1\u001b[0m \u001b[0mdic1\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0;34m{\u001b[0m\u001b[0;34m'a'\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;36m20\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;34m'b'\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;36m25\u001b[0m\u001b[0;34m}\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m      2\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 3\u001b[0;31m \u001b[0mdic1\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;34m'z'\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[0;31mKeyError\u001b[0m: 'z'"
     ]
    }
   ],
   "source": [
    "dic1 = {'a':20, 'b':25}\n",
    "\n",
    "dic1['z']"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "ename": "FileNotFoundError",
     "evalue": "[Errno 2] No such file or directory: 'abc.txt'",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mFileNotFoundError\u001b[0m                         Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-5-befa419cc814>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mopen\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"abc.txt\"\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[0;31mFileNotFoundError\u001b[0m: [Errno 2] No such file or directory: 'abc.txt'"
     ]
    }
   ],
   "source": [
    "open(\"abc.txt\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "ename": "ValueError",
     "evalue": "invalid literal for int() with base 10: '7.2'",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mValueError\u001b[0m                                Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-6-29fa82e573ec>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m'7.2'\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: '7.2'"
     ]
    }
   ],
   "source": [
    "int('7.2')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "ename": "ValueError",
     "evalue": "invalid literal for int() with base 10: 'a'",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mValueError\u001b[0m                                Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-7-233884bacd4e>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m'a'\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: 'a'"
     ]
    }
   ],
   "source": [
    "int('a')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "ename": "TypeError",
     "evalue": "'int' object is not iterable",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-8-9628d4b5ff2c>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mlist\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;36m2032\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[0;31mTypeError\u001b[0m: 'int' object is not iterable"
     ]
    }
   ],
   "source": [
    "list(2032)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['name']"
      ]
     },
     "execution_count": 1,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "list({\"name\": \"John\"})"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['2', '0', '3', '2']"
      ]
     },
     "execution_count": 9,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "list('2032')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Exception Handling"
   ]
  },
  {
   "cell_type": "raw",
   "metadata": {},
   "source": [
    "try:\n",
    "    your code\n",
    "except (err1Class,err2Class,...):\n",
    "    message show against your errClass\n",
    "else:\n",
    "    message show if exception did'nt raise\n",
    "finally:\n",
    "    always run this block"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Start.......\n",
      "You cannot divide a number by zero!\n",
      "End......\n"
     ]
    }
   ],
   "source": [
    "print(\"Start.......\")\n",
    "\n",
    "try:\n",
    "    print(6 / 0)\n",
    "except ZeroDivisionError:  \n",
    "    print(\"You cannot divide a number by zero!\")\n",
    "    \n",
    "\n",
    "print(\"End......\")    "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Start.......\n",
      "Ap Zero sy Divide nhi kr sakty!\n",
      "End......\n"
     ]
    }
   ],
   "source": [
    "print(\"Start.......\")\n",
    "\n",
    "try:\n",
    "    a = [2,3]\n",
    "    print(a[7])\n",
    "except IndexError:  \n",
    "    print(\"Index 7 doesnot exists!\")\n",
    "    \n",
    "\n",
    "print(\"End......\") "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Start.......\n",
      "abc.txt file does not found in your directory!\n",
      "End......\n"
     ]
    }
   ],
   "source": [
    "print(\"Start.......\")\n",
    "\n",
    "try:\n",
    "    open('abc.txt')\n",
    "except FileNotFoundError:  \n",
    "    print(\"abc.txt file does not found in your directory!\")\n",
    "    \n",
    "\n",
    "print(\"End......\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Start.......\n",
      "ABC\n",
      "End......\n"
     ]
    }
   ],
   "source": [
    "print(\"Start.......\")\n",
    "\n",
    "try:\n",
    "    open('abc.txt')\n",
    "    a = [2,3]\n",
    "    print(a[7])\n",
    "    print(6 / 0)\n",
    "    \n",
    "except (FileNotFoundError, ZeroDivisionError,IndexError):  \n",
    "    print(\"ABC\")\n",
    "    \n",
    "\n",
    "print(\"End......\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Start.......\n",
      "file Not found\n",
      "Out of index\n",
      "Zero Division Error\n",
      "End......\n"
     ]
    }
   ],
   "source": [
    "print(\"Start.......\")\n",
    "\n",
    "try :\n",
    "    open('abc.txt')\n",
    "except FileNotFoundError:\n",
    "    print(\"file Not found\")\n",
    "    \n",
    "try:\n",
    "    a = [2,3]\n",
    "    print(a[7])\n",
    "except IndexError:\n",
    "    print(\"Out of index\")\n",
    "\n",
    "try:    \n",
    "    print(6 / 0)\n",
    "\n",
    "except ZeroDivisionError:  \n",
    "    print(\"Zero Division Error\")\n",
    "    \n",
    "\n",
    "print(\"End......\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "We are trying to solve some problems....\n"
     ]
    }
   ],
   "source": [
    "try:\n",
    "    open('abc.txt')\n",
    "    a = [2,3]\n",
    "    print(a[7])\n",
    "    print(6 / 0)\n",
    "except:\n",
    "    print(\"We are trying to solve some problems....\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Sorry division by zero\n"
     ]
    }
   ],
   "source": [
    "try:\n",
    "    print(6 / 0)\n",
    "    open('abc.txt')\n",
    "    a = [2,3]\n",
    "    print(a[7])\n",
    "    print(6 / 0)\n",
    "except Exception as e:\n",
    "    print(\"Sorry\",e)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "division by zero\n"
     ]
    }
   ],
   "source": [
    "try:\n",
    "    print(7 / 0)\n",
    "except Exception as a:\n",
    "    print(a)\n",
    "else:\n",
    "    print(\"Your Code is runing without any error\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 25,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "3.5\n",
      "Your Code is runing without any error\n"
     ]
    }
   ],
   "source": [
    "try:\n",
    "    print(7 / 2)\n",
    "except Exception as a:\n",
    "    print(a)\n",
    "else:\n",
    "    print(\"Your Code is runing without any error\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 26,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "division by zero\n",
      "Chalna hai Chalna hai! Mobin Al Hassan\n"
     ]
    }
   ],
   "source": [
    "try:\n",
    "    print(7 / 0)\n",
    "except Exception as a:\n",
    "    print(a)\n",
    "else:\n",
    "    print(\"Your Code is runing without any error\")\n",
    "finally:\n",
    "    print(\"Chalna hai Chalna hai!\", \"Mobin Al Hassan\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 27,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "3.5\n",
      "Your Code is runing without any error\n",
      "Chalna hai Chalna hai! Mobin Al Hassan\n"
     ]
    }
   ],
   "source": [
    "try:\n",
    "    print(7 / 2)\n",
    "except Exception as a:\n",
    "    print(a)\n",
    "else:\n",
    "    print(\"Your Code is runing without any error\")\n",
    "finally:\n",
    "    print(\"Chalna hai Chalna hai!\", \"Mobin Al Hassan\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'win32'"
      ]
     },
     "execution_count": 11,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "import sys\n",
    "sys.platform"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Raise"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "25\n"
     ]
    }
   ],
   "source": [
    "\n",
    "class Student():\n",
    "    def __init__(self,name,age):\n",
    "        if (age<18 or age>80):\n",
    "            raise Exception(\"Age can not be greater then 80 and less then 16\")\n",
    "        self.name = name\n",
    "        self.age = age\n",
    "\n",
    "st = Student(\"Asif\",25)\n",
    "print(st.age)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Age can not be greater then 80 and less then 16\n"
     ]
    }
   ],
   "source": [
    "try:\n",
    "    st1 = Student(\"Asif\",16)\n",
    "except Exception as e:\n",
    "    print(e)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
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