8_Exception.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "ename": "ZeroDivisionError",
     "evalue": "division by zero",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mZeroDivisionError\u001b[0m                         Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-1-521e264d16b7>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m      1\u001b[0m \u001b[1;31m#Exception : Exceptional conditions like\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 2\u001b[1;33m \u001b[1;36m1\u001b[0m \u001b[1;33m/\u001b[0m \u001b[1;36m0\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[1;31mZeroDivisionError\u001b[0m: division by zero"
     ]
    }
   ],
   "source": [
    "#Exception : Exceptional conditions like\n",
    "1 / 0"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "ename": "Exception",
     "evalue": "",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mException\u001b[0m                                 Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-2-cf2bebf6870b>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m      1\u001b[0m \u001b[1;31m# To raise an exception, you use the raise statement with an argument that is either a class (which should subclass Exception)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      2\u001b[0m \u001b[1;31m# or an instance\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 3\u001b[1;33m \u001b[1;32mraise\u001b[0m \u001b[0mException\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[1;31mException\u001b[0m: "
     ]
    }
   ],
   "source": [
    "# To raise an exception, you use the raise statement with an argument that is either a class (which should subclass Exception)\n",
    "# or an instance\n",
    "raise Exception"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "ename": "Exception",
     "evalue": "hyperdrive overload",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mException\u001b[0m                                 Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-3-b481b551ffb5>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m      1\u001b[0m \u001b[1;31m# or\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 2\u001b[1;33m \u001b[1;32mraise\u001b[0m \u001b[0mException\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m'hyperdrive overload'\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[1;31mException\u001b[0m: hyperdrive overload"
     ]
    }
   ],
   "source": [
    "# or\n",
    "raise Exception('hyperdrive overload')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "ename": "ArithmeticError",
     "evalue": "",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mArithmeticError\u001b[0m                           Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-4-6eb9b10d0ec4>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[1;32m----> 1\u001b[1;33m \u001b[1;32mraise\u001b[0m \u001b[0mArithmeticError\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[1;31mArithmeticError\u001b[0m: "
     ]
    }
   ],
   "source": [
    "raise ArithmeticError"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "Exception            The base class for almost all exceptions.\n",
    "AttributeError       Raised when attribute reference or assignment fails.\n",
    "OSError              Raised when the operating system can’t perform a task, such as a file, for example. Has several specific subclasses.\n",
    "IndexError           Raised when using a nonexistent index on a sequence. Subclass of LookupError.\n",
    "KeyError             Raised when using a nonexistent key on a mapping. Subclass of LookupError.\n",
    "NameError            Raised when a name (variable) is not found.\n",
    "SyntaxError          Raised when the code is ill-formed.\n",
    "TypeError            Raised when a built-in operation or function is applied to an object of the wrong type.\n",
    "ValueError           Raised when a built-in operation or function is applied to an object with the correct type but with an inappropriate value.\n",
    "ZeroDivisionError    Raised when the second argument of a division or modulo operation is zero."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Custom Exception Classes\n",
    "class SomeCustomException(Exception): pass\n",
    "# atleast add some methods, otherwise useless"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "name": "stdin",
     "output_type": "stream",
     "text": [
      "Enter the first number:  6\n",
      "Enter the second number:  0\n"
     ]
    },
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "The second number can't be zero!\n"
     ]
    }
   ],
   "source": [
    "# Catching Exceptions\n",
    "try:\n",
    "    x = int(input('Enter the first number: '))\n",
    "    y = int(input('Enter the second number: '))\n",
    "    print(x / y)\n",
    "except ZeroDivisionError:\n",
    "    print(\"The second number can't be zero!\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "name": "stdin",
     "output_type": "stream",
     "text": [
      "Enter the first number:  6\n",
      "Enter the second number:  0\n"
     ]
    },
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "The second number can't be zero!\n"
     ]
    }
   ],
   "source": [
    "try:\n",
    "    x = int(input('Enter the first number: '))\n",
    "    y = int(input('Enter the second number: '))\n",
    "    print(x / y)\n",
    "except Exception:\n",
    "    print(\"The second number can't be zero!\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [
    {
     "name": "stdin",
     "output_type": "stream",
     "text": [
      "Enter the first number:  6\n",
      "Enter the second number:  0\n"
     ]
    },
    {
     "ename": "ZeroDivisionError",
     "evalue": "division by zero",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mZeroDivisionError\u001b[0m                         Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-9-dd1ed9919b7c>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m      2\u001b[0m     \u001b[0mx\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mint\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0minput\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m'Enter the first number: '\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      3\u001b[0m     \u001b[0my\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mint\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0minput\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m'Enter the second number: '\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 4\u001b[1;33m     \u001b[0mprint\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mx\u001b[0m \u001b[1;33m/\u001b[0m \u001b[0my\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m      5\u001b[0m \u001b[1;32mexcept\u001b[0m \u001b[0mSomeCustomException\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      6\u001b[0m     \u001b[0mprint\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m\"The second number can't be zero!\"\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
      "\u001b[1;31mZeroDivisionError\u001b[0m: division by zero"
     ]
    }
   ],
   "source": [
    "try:\n",
    "    x = int(input('Enter the first number: '))\n",
    "    y = int(input('Enter the second number: '))\n",
    "    print(x / y)\n",
    "except SomeCustomException:\n",
    "    print(\"The second number can't be zero!\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [],
   "source": [
    "# If you have caught an exception but you want to raise it again, you can call raise without any arguments\n",
    "class MuffledCalculator:\n",
    "    muffled = False\n",
    "    def calc(self, expr):\n",
    "        try:\n",
    "            return eval(expr)\n",
    "        except ZeroDivisionError:                # Caught Exception Here\n",
    "            if self.muffled:\n",
    "                print('Division by zero is illegal')\n",
    "            else:\n",
    "                raise                             # Raise here again"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "5.0"
      ]
     },
     "execution_count": 11,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "calculator = MuffledCalculator()\n",
    "calculator.calc('10 / 2')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [
    {
     "ename": "ZeroDivisionError",
     "evalue": "division by zero",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mZeroDivisionError\u001b[0m                         Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-12-21244b9ffa56>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[1;32m----> 1\u001b[1;33m \u001b[0mcalculator\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mcalc\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m'10 / 0'\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[1;32m<ipython-input-10-f8b8160e87a1>\u001b[0m in \u001b[0;36mcalc\u001b[1;34m(self, expr)\u001b[0m\n\u001b[0;32m      3\u001b[0m     \u001b[1;32mdef\u001b[0m \u001b[0mcalc\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mself\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0mexpr\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      4\u001b[0m         \u001b[1;32mtry\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 5\u001b[1;33m             \u001b[1;32mreturn\u001b[0m \u001b[0meval\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mexpr\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m      6\u001b[0m         \u001b[1;32mexcept\u001b[0m \u001b[0mZeroDivisionError\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      7\u001b[0m             \u001b[1;32mif\u001b[0m \u001b[0mself\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mmuffled\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
      "\u001b[1;32m<string>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n",
      "\u001b[1;31mZeroDivisionError\u001b[0m: division by zero"
     ]
    }
   ],
   "source": [
    "calculator.calc('10 / 0')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Division by zero is illegal\n"
     ]
    }
   ],
   "source": [
    "calculator.muffled = True\n",
    "calculator.calc('10 / 0')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {},
   "outputs": [
    {
     "ename": "ValueError",
     "evalue": "",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mZeroDivisionError\u001b[0m                         Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-14-5a9851e6fb26>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m      4\u001b[0m \u001b[1;32mtry\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 5\u001b[1;33m     \u001b[1;36m1\u001b[0m\u001b[1;33m/\u001b[0m\u001b[1;36m0\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m      6\u001b[0m \u001b[1;32mexcept\u001b[0m \u001b[0mZeroDivisionError\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
      "\u001b[1;31mZeroDivisionError\u001b[0m: division by zero",
      "\nDuring handling of the above exception, another exception occurred:\n",
      "\u001b[1;31mValueError\u001b[0m                                Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-14-5a9851e6fb26>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m      5\u001b[0m     \u001b[1;36m1\u001b[0m\u001b[1;33m/\u001b[0m\u001b[1;36m0\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      6\u001b[0m \u001b[1;32mexcept\u001b[0m \u001b[0mZeroDivisionError\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 7\u001b[1;33m     \u001b[1;32mraise\u001b[0m \u001b[0mValueError\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[1;31mValueError\u001b[0m: "
     ]
    }
   ],
   "source": [
    "# Using raise with no arguments is often a good choice in an except clause, if you’re unable to handle\n",
    "# the exception. Sometimes you may want to raise a different exception\n",
    "\n",
    "try:\n",
    "    1/0\n",
    "except ZeroDivisionError:\n",
    "    raise ValueError"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "metadata": {},
   "outputs": [
    {
     "ename": "ValueError",
     "evalue": "",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mValueError\u001b[0m                                Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-15-265908f4be25>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m      3\u001b[0m     \u001b[1;36m1\u001b[0m\u001b[1;33m/\u001b[0m\u001b[1;36m0\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      4\u001b[0m \u001b[1;32mexcept\u001b[0m \u001b[0mZeroDivisionError\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 5\u001b[1;33m     \u001b[1;32mraise\u001b[0m \u001b[0mValueError\u001b[0m \u001b[1;32mfrom\u001b[0m \u001b[1;32mNone\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[1;31mValueError\u001b[0m: "
     ]
    }
   ],
   "source": [
    "# Supress Context\n",
    "try:\n",
    "    1/0\n",
    "except ZeroDivisionError:\n",
    "    raise ValueError from None"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "metadata": {},
   "outputs": [
    {
     "name": "stdin",
     "output_type": "stream",
     "text": [
      "Enter the first number:  6\n",
      "Enter the second number:  Abhishek\n"
     ]
    },
    {
     "ename": "ValueError",
     "evalue": "invalid literal for int() with base 10: 'Abhishek'",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mValueError\u001b[0m                                Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-16-ff5ab821eb97>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m      2\u001b[0m \u001b[1;32mtry\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      3\u001b[0m     \u001b[0mx\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mint\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0minput\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m'Enter the first number: '\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 4\u001b[1;33m     \u001b[0my\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mint\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0minput\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m'Enter the second number: '\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m      5\u001b[0m     \u001b[0mprint\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mx\u001b[0m \u001b[1;33m/\u001b[0m \u001b[0my\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      6\u001b[0m \u001b[1;32mexcept\u001b[0m \u001b[0mZeroDivisionError\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
      "\u001b[1;31mValueError\u001b[0m: invalid literal for int() with base 10: 'Abhishek'"
     ]
    }
   ],
   "source": [
    "# More than one exception\n",
    "try:\n",
    "    x = int(input('Enter the first number: '))\n",
    "    y = int(input('Enter the second number: '))\n",
    "    print(x / y)\n",
    "except ZeroDivisionError:\n",
    "    print(\"The second number can't be zero!\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "metadata": {},
   "outputs": [
    {
     "name": "stdin",
     "output_type": "stream",
     "text": [
      "Enter the first number:  6\n",
      "Enter the second number:  Abhishek\n"
     ]
    },
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "That wasn't a number, was it?\n"
     ]
    }
   ],
   "source": [
    "try:\n",
    "    x = int(input('Enter the first number: '))\n",
    "    y = int(input('Enter the second number: '))\n",
    "    print(x / y)\n",
    "except ZeroDivisionError:\n",
    "    print(\"The second number can't be zero!\")\n",
    "except Exception:\n",
    "    print(\"That wasn't a number, was it?\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "metadata": {},
   "outputs": [
    {
     "name": "stdin",
     "output_type": "stream",
     "text": [
      "Enter the first number:  6\n",
      "Enter the second number:  Abhisehk\n"
     ]
    },
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Kuch bhi Error hai\n"
     ]
    }
   ],
   "source": [
    "# Catching Two Exceptions with One Block\n",
    "\n",
    "try:\n",
    "    x = int(input('Enter the first number: '))\n",
    "    y = int(input('Enter the second number: '))\n",
    "    print(x / y)\n",
    "except (ZeroDivisionError, TypeError, NameError, Exception):\n",
    "    print(\"Kuch bhi Error hai\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 21,
   "metadata": {},
   "outputs": [
    {
     "name": "stdin",
     "output_type": "stream",
     "text": [
      "Enter the first number:  5\n",
      "Enter the second number:  abhishek\n"
     ]
    },
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "invalid literal for int() with base 10: 'abhishek'\n"
     ]
    }
   ],
   "source": [
    "# Cating the object\n",
    "try:\n",
    "    x = int(input('Enter the first number: '))\n",
    "    y = int(input('Enter the second number: '))\n",
    "    print(x / y)\n",
    "except (ZeroDivisionError, TypeError, NameError, Exception) as e:\n",
    "    print(e)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 22,
   "metadata": {},
   "outputs": [
    {
     "name": "stdin",
     "output_type": "stream",
     "text": [
      "Enter the first number:  6\n",
      "Enter the second number:  abhishek\n"
     ]
    },
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Something wrong happened ...\n"
     ]
    }
   ],
   "source": [
    "# Even if the program handles several types of exceptions, some may still slip through\n",
    "try:\n",
    "    x = int(input('Enter the first number: '))\n",
    "    y = int(input('Enter the second number: '))\n",
    "    print(x / y)\n",
    "except:                                                     #Omit Exception class here, and then you can catch \n",
    "    print('Something wrong happened ...')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 23,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "A simple task\n",
      "Ah ... It went as planned.\n"
     ]
    }
   ],
   "source": [
    "# And when all is well\n",
    "try:\n",
    "    print('A simple task')\n",
    "except:\n",
    "    print('What? Something went wrong?')\n",
    "else:\n",
    "    print('Ah ... It went as planned.')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 25,
   "metadata": {},
   "outputs": [
    {
     "name": "stdin",
     "output_type": "stream",
     "text": [
      "Enter the first number:  4\n",
      "Enter the second number:  abhishek\n"
     ]
    },
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Invalid input. Please try again.\n"
     ]
    },
    {
     "name": "stdin",
     "output_type": "stream",
     "text": [
      "Enter the first number:  5\n",
      "Enter the second number:  0\n"
     ]
    },
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Invalid input. Please try again.\n"
     ]
    },
    {
     "name": "stdin",
     "output_type": "stream",
     "text": [
      "Enter the first number:  4\n",
      "Enter the second number:  1\n"
     ]
    },
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "x / y is 4.0\n"
     ]
    }
   ],
   "source": [
    "# With this else clause, you can implement the loop\n",
    "while True:\n",
    "    try:\n",
    "        x = int(input('Enter the first number: '))\n",
    "        y = int(input('Enter the second number: '))\n",
    "        value = x / y\n",
    "        print('x / y is', value)\n",
    "    except:\n",
    "        print('Invalid input. Please try again.')\n",
    "    else:\n",
    "        break"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 26,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Cleaning up ...\n"
     ]
    },
    {
     "ename": "ZeroDivisionError",
     "evalue": "division by zero",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mZeroDivisionError\u001b[0m                         Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-26-65c07360991c>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m      5\u001b[0m \u001b[0mx\u001b[0m \u001b[1;33m=\u001b[0m \u001b[1;32mNone\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      6\u001b[0m \u001b[1;32mtry\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 7\u001b[1;33m     \u001b[0mx\u001b[0m \u001b[1;33m=\u001b[0m \u001b[1;36m1\u001b[0m \u001b[1;33m/\u001b[0m \u001b[1;36m0\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m      8\u001b[0m \u001b[1;32mfinally\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      9\u001b[0m     \u001b[0mprint\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m'Cleaning up ...'\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
      "\u001b[1;31mZeroDivisionError\u001b[0m: division by zero"
     ]
    }
   ],
   "source": [
    "# And Finally\n",
    "# use it to do housekeeping after a possible exception\n",
    "# It is combined with a try clause\n",
    "\n",
    "x = None\n",
    "try:\n",
    "    x = 1 / 0\n",
    "finally:\n",
    "    print('Cleaning up ...')\n",
    "    del x"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 28,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Unknown variable\n",
      "Cleaning up.\n"
     ]
    }
   ],
   "source": [
    "# using all of them (Any Three will run, either except or else). \n",
    "# Try and finally block to chalega hi\n",
    "try:\n",
    "    1 / 0\n",
    "except:\n",
    "    print(\"Unknown variable\")\n",
    "else:\n",
    "    print(\"That went well!\")\n",
    "finally:\n",
    "    print(\"Cleaning up.\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 29,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Exceptions and Functions\n",
    "def faulty():\n",
    "    raise Exception('Something is wrong')\n",
    "\n",
    "def ignore_exception():\n",
    "    faulty()\n",
    "\n",
    "def handle_exception():\n",
    "    try:\n",
    "        faulty()\n",
    "    except:\n",
    "        print('Exception handled')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 30,
   "metadata": {},
   "outputs": [
    {
     "ename": "NameError",
     "evalue": "name 'gnore_exception' is not defined",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mNameError\u001b[0m                                 Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-30-13da5cfc3723>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[1;32m----> 1\u001b[1;33m \u001b[0mgnore_exception\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[1;31mNameError\u001b[0m: name 'gnore_exception' is not defined"
     ]
    }
   ],
   "source": [
    "gnore_exception()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 31,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Exception handled\n"
     ]
    }
   ],
   "source": [
    "handle_exception()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 32,
   "metadata": {},
   "outputs": [],
   "source": [
    "# The Zen of Exceptions\n",
    "# Not a hard thing, when you know that some part of your code may cause a certain kind of exception and you don’t simply want your program to \n",
    "# terminate with a stack trace, use try/except or try/finally\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 34,
   "metadata": {},
   "outputs": [
    {
     "name": "stderr",
     "output_type": "stream",
     "text": [
      "D:\\Anaconda3\\lib\\site-packages\\ipykernel_launcher.py:4: UserWarning: I've got a bad feeling about this.\n",
      "  after removing the cwd from sys.path.\n"
     ]
    }
   ],
   "source": [
    "# Not All That Exceptional\n",
    "# If you just want to provide a warning\n",
    "from warnings import warn\n",
    "warn(\"I've got a bad feeling about this.\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 37,
   "metadata": {},
   "outputs": [
    {
     "ename": "UserWarning",
     "evalue": "Something is very wrong!",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mUserWarning\u001b[0m                               Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-37-8f08087dc99b>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m      3\u001b[0m \u001b[0mwarn\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m\"any one out there\"\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      4\u001b[0m \u001b[0mfilterwarnings\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m\"error\"\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 5\u001b[1;33m \u001b[0mwarn\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m\"Something is very wrong!\"\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[1;31mUserWarning\u001b[0m: Something is very wrong!"
     ]
    }
   ],
   "source": [
    "# Supress some warnings\n",
    "from warnings import filterwarnings\n",
    "filterwarnings(\"ignore\")\n",
    "warn(\"any one out there\")\n",
    "filterwarnings(\"error\")\n",
    "warn(\"Something is very wrong!\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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