Chapter - Exceptions Super 5  - 2.30 4.30 18 Dec 2019 (1).ipynb

{
 "cells": [
  {
   "cell_type": "raw",
   "metadata": {},
   "source": [
    "# Errors \n",
    "    # Syntax\n",
    "        ## Your program will not be executed until you fix it.\n",
    "        ## Mistake of Programmer or Developer\n",
    "    # Logical / Business Error\n",
    "        ## Mistake of Programmer or Developer\n",
    "        ## Process will be executed but output may be or may not be up to the requirement.\n",
    "    # Input Error \n",
    "        ## It is mistake naive / end user.\n",
    "        ## Input Error or User Mistake can be handled by exception handling\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "ename": "NameError",
     "evalue": "name 'fprint' 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-2-a1724832b55c>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[1;32m----> 1\u001b[1;33m \u001b[0mfprint\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m'Hello! World'\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 'fprint' is not defined"
     ]
    }
   ],
   "source": [
    "fprint('Hello! World')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Hello! World\n"
     ]
    }
   ],
   "source": [
    "print('Hello! World')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "1\n",
      "2\n",
      "3\n",
      "4\n",
      "5\n",
      "6\n",
      "7\n",
      "8\n",
      "9\n",
      "10\n"
     ]
    }
   ],
   "source": [
    "ctr=1\n",
    "while ctr<=10:\n",
    "    print(ctr)\n",
    "    ctr+=1"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [],
   "source": [
    "L=[10,20,30]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "ename": "IndexError",
     "evalue": "list index out of range",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mIndexError\u001b[0m                                Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-7-1eef6b78def1>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[1;32m----> 1\u001b[1;33m \u001b[0mL\u001b[0m\u001b[1;33m[\u001b[0m\u001b[1;36m4\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[1;31mIndexError\u001b[0m: list index out of range"
     ]
    }
   ],
   "source": [
    "L[4]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [],
   "source": [
    "## Exception Handling\n",
    "## The Process which generate unwanted result behalf of user mistake, has been handled into the specific block and that block is\n",
    "## called try\n",
    "## After getting the system crash alert has been handled into the except block\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "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-9-e574edb36883>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[1;32m----> 1\u001b[1;33m \u001b[1;36m10\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": [
    "10/0\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "The index of List to show the element4\n"
     ]
    },
    {
     "ename": "IndexError",
     "evalue": "list index out of range",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mIndexError\u001b[0m                                Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-14-16ceca3767c0>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m      1\u001b[0m \u001b[0mL\u001b[0m\u001b[1;33m=\u001b[0m\u001b[1;33m[\u001b[0m\u001b[1;36m10\u001b[0m\u001b[1;33m,\u001b[0m\u001b[1;36m20\u001b[0m\u001b[1;33m,\u001b[0m\u001b[1;36m30\u001b[0m\u001b[1;33m,\u001b[0m\u001b[1;36m40\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[0minx\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'The index of List to show the element'\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----> 3\u001b[1;33m \u001b[0mprint\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mL\u001b[0m\u001b[1;33m[\u001b[0m\u001b[0minx\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;31mIndexError\u001b[0m: list index out of range"
     ]
    }
   ],
   "source": [
    "L=[10,20,30,40]\n",
    "inx=int(input('The index of List to show the element'))\n",
    "try:\n",
    "    print(L[inx])\n",
    "except IndexError as ae:\n",
    "    print(ae)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "The index of List to show the element4\n",
      "list index out of range\n",
      "length of List is 4, and the index you inputed 4\n",
      "the last index of List is 3\n"
     ]
    }
   ],
   "source": [
    "L=[10,20,30,40]\n",
    "inx=int(input('The index of List to show the element'))\n",
    "try:\n",
    "    print(L[inx])\n",
    "except IndexError as ae:\n",
    "    print(ae)\n",
    "    print('length of List is {}, and the index you inputed {}'.format(len(L),inx))\n",
    "    print('the last index of List is {}'.format(len(L)-1))"
   ]
  },
  {
   "cell_type": "raw",
   "metadata": {},
   "source": [
    "ArithmeticError – The base class for the variety of arithmetic errors, such as when attempting to divide by zero, or when an arithmetic result would be too large for Python to accurately represent.\n",
    "AssertionError – This error is raised when a call to the [assert] statement fails.\n",
    "AttributeError – Python’s syntax includes something called attribute references, which is just the Python way of describing what you might know of as dot notation. In essence, any primary token in Python (like an identifier, literal, and so forth) can be written and followed by a period (.), which is then followed by an identifier. That syntax (i.e. primary.identifier) is called an attribute reference, and anytime the executing script encounters an error in such syntax an AttributeError is raised.\n",
    "BufferError – Python allows applications to access low level memory streams in the form of a buffer. For example, the bytes class can be used to directly work with bytes of information via a memory buffer. When something goes wrong within such a buffer operation a BufferError is raised.\n",
    "EOFError – Similar to the Java EOFException article we did a few days ago, Python’s EOFError is raised when using the input() function and reaching the end of a file without any data.\n",
    "ImportError – Modules are usually loaded in memory for Python scripts to use via the import statement (e.g. import car from vehicles). However, if an import attempt fails an ImportError will often be raised.\n",
    "LookupError – Like ArithmeticError, the LookupError is generally considered a base class from which other subclasses should inherit. All LookupError subclasses deal with improper calls to a collection are made by using invalid key or index values.\n",
    "MemoryError – In the event that your Python application is about to run out of memory a MemoryError will be raised. Since Python is smart enough to detect this potential issue slightly before all memory is used up, a MemoryError can be rescued and allow you to recover from the situation by performing garbage collection of some kind.\n",
    "NameError – Raised when trying to use an identifier with an invalid or unknown name.\n",
    "OSError – This error is raised when a system-level problem occurs, such as failing to find a local file on disk or running out of disk space entirely. OSError is a parent class to many subclasses explicitly used for certain issues related to operating system failure, so we’ll explore those in future publications.\n",
    "ReferenceError – Python includes the weakref module, which allows Python code to create a specific type of reference known as a weak reference. A weak reference is a reference that is not “strong” enough to keep the referenced object alive. This means that the next cycle of garbage collection will identify the weakly referenced object as no longer strongly referenced by another object, causing the weakly referenced object to be destroyed to free up resources. If a weak reference proxy created via the weakref.proxy() function is used after the object that is referenced has already been destroyed via garbage collection, a ReferenceError will be raised.\n",
    "RuntimeError – A RuntimeError is typically used as a catchall for when an error occurs that doesn’t really fit into any other specific error classification.\n",
    "StopIteration – If no default value is passed to the next() function when iterating over a collection, and that collection has no more iterated value to retrieve, a StopIteration exception is raised. Note that this is not classified as an Error, since it doesn’t mean that an error has occurred.\n",
    "StopAsyncIteration – As of version 3.5, Python now includes coroutines for asynchronous transactions using the async and await syntax. As part of this feature, collections can be asynchronously iterated using the __anext__() method. The __anext__() method requires that a StopAsyncIteration instance be raised in order to halt async iteration.\n",
    "SyntaxError – Just like most programming languages, a SyntaxError in Python indicates that there is some improper syntax somewhere in your script file. A SyntaxError can be raised directly from an executing script, or produced via functions like eval() and exec().\n",
    "SystemError – A generic error that is raised when something goes wrong with the Python interpreter (not to be confused with the OSError, which handles operating system issues).\n",
    "TypeError – This error is raised when attempting to perform an operation on an incorrect object type.\n",
    "ValueError – Should be raised when a function or method receives an argument of the correct type, but with an actual value that is invalid for some reason.\n",
    "Warning – Another parent class to many subclasses, the Warning class is used to alert the user in non-dire situations. There are a number of subclass warnings that we’ll explore in future articles."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 29,
   "metadata": {},
   "outputs": [],
   "source": [
    "X=100"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 30,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "300\n"
     ]
    }
   ],
   "source": [
    "try:\n",
    "    print(x+100)\n",
    "except:\n",
    "    print(X)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 27,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "300\n"
     ]
    }
   ],
   "source": [
    "print(x+100)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 33,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Enter a number50\n",
      "Enter a number0\n",
      "Zero Division Error\n",
      "Executed\n"
     ]
    }
   ],
   "source": [
    "# Finally block -> It always execute either your program occured exception or not\n",
    "A=int(input('Enter a number'))\n",
    "B=int(input('Enter a number'))\n",
    "try:\n",
    "    res=A/B\n",
    "    print(res)\n",
    "except :\n",
    "    print('Zero Division Error')\n",
    "finally:\n",
    "    print('Executed')\n",
    "#ValueError  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 40,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Enter a number\n",
      "Value not provided\n",
      "Executed\n"
     ]
    }
   ],
   "source": [
    "try:\n",
    "    A=int(input('Enter a number'))\n",
    "    B=int(input('Enter a number'))\n",
    "    res=A/B\n",
    "    print(res)\n",
    "except :\n",
    "    print('Value not provided')\n",
    "finally:\n",
    "    print('Executed')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 41,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Enter a number\n",
      "Executed\n"
     ]
    },
    {
     "ename": "ValueError",
     "evalue": "invalid literal for int() with base 10: ''",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mValueError\u001b[0m                                Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-41-7961e96008f1>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m      1\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----> 2\u001b[1;33m     \u001b[0mA\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 a 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      3\u001b[0m     \u001b[0mB\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 a 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      4\u001b[0m     \u001b[0mres\u001b[0m\u001b[1;33m=\u001b[0m\u001b[0mA\u001b[0m\u001b[1;33m/\u001b[0m\u001b[0mB\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      5\u001b[0m     \u001b[0mprint\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mres\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: ''"
     ]
    }
   ],
   "source": [
    "try:\n",
    "    A=int(input('Enter a number'))\n",
    "    B=int(input('Enter a number'))\n",
    "    res=A/B\n",
    "    print(res)\n",
    "except ZeroDivisionError as ze:\n",
    "    print('Nuber divided by zero')\n",
    "    print(ze)\n",
    "\n",
    "finally:\n",
    "    print('Executed')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 43,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Enter a number\n",
      "Value Error\n",
      "Executed\n"
     ]
    }
   ],
   "source": [
    "try:\n",
    "    A=int(input('Enter a number'))\n",
    "    B=int(input('Enter a number'))\n",
    "    res=A/B\n",
    "    print(res)\n",
    "except ZeroDivisionError as ze:\n",
    "    print('Nuber divided by zero')\n",
    "    print(ze)\n",
    "except ValueError as ve:\n",
    "    print('Value Error')\n",
    "except NameError as ne:\n",
    "    print('Name value')\n",
    "\n",
    "finally:\n",
    "    print('Executed')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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