30_Exception Handling.ipynb

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   "cell_type": "markdown",
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   "source": [
    "# Exception Handling\n",
    "Common Exceptions\n",
    "\n",
    "Exception Handling\n",
    "\n",
    "Try\n",
    "\n",
    "Except\n",
    "\n",
    "Try except else\n",
    "\n",
    "Finally\n",
    "\n",
    "Raising exceptions\n",
    "\n",
    "Assertion"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Exception\n",
    "\n",
    "runtime errors"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "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-b4ac6c0d36ea>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[1;32m      2\u001b[0m \u001b[0mb\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0;36m1\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[0mb\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;31mZeroDivisionError\u001b[0m: division by zero"
     ]
    }
   ],
   "source": [
    "a = 0\n",
    "b = 1\n",
    "\n",
    "print(b/a)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "ename": "TypeError",
     "evalue": "can only concatenate str (not \"int\") to str",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-2-8a6a44a64e60>\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[0;34m\"A\"\u001b[0m \u001b[0;34m+\u001b[0m \u001b[0;36m10\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: can only concatenate str (not \"int\") to str"
     ]
    }
   ],
   "source": [
    "print(\"A\" + 10)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "ename": "NameError",
     "evalue": "name 'y' 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-3-d9183e048de3>\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[0my\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 'y' is not defined"
     ]
    }
   ],
   "source": [
    "print(y)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### common exceptions\n",
    "\n",
    "ImportError\n",
    "\n",
    "IndexError\n",
    "\n",
    "NameError\n",
    "\n",
    "SyntaxError\n",
    "\n",
    "TypeError\n",
    "\n",
    "ValueError"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Exception Handling\n",
    "\n",
    "try - a block that might contains exceptions\n",
    "\n",
    "except - contains the exception msg / handling code"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "An Error Occured\n"
     ]
    }
   ],
   "source": [
    "try:\n",
    "    a = 7\n",
    "    b = 0\n",
    "    print(a/b)\n",
    "    print(\"Finish\")\n",
    "except ZeroDivisionError:\n",
    "    print(\"An Error Occured\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Help on class ZeroDivisionError in module builtins:\n",
      "\n",
      "class ZeroDivisionError(ArithmeticError)\n",
      " |  Second argument to a division or modulo operation was zero.\n",
      " |  \n",
      " |  Method resolution order:\n",
      " |      ZeroDivisionError\n",
      " |      ArithmeticError\n",
      " |      Exception\n",
      " |      BaseException\n",
      " |      object\n",
      " |  \n",
      " |  Methods defined here:\n",
      " |  \n",
      " |  __init__(self, /, *args, **kwargs)\n",
      " |      Initialize self.  See help(type(self)) for accurate signature.\n",
      " |  \n",
      " |  ----------------------------------------------------------------------\n",
      " |  Static methods defined here:\n",
      " |  \n",
      " |  __new__(*args, **kwargs) from builtins.type\n",
      " |      Create and return a new object.  See help(type) for accurate signature.\n",
      " |  \n",
      " |  ----------------------------------------------------------------------\n",
      " |  Methods inherited from BaseException:\n",
      " |  \n",
      " |  __delattr__(self, name, /)\n",
      " |      Implement delattr(self, name).\n",
      " |  \n",
      " |  __getattribute__(self, name, /)\n",
      " |      Return getattr(self, name).\n",
      " |  \n",
      " |  __reduce__(...)\n",
      " |      Helper for pickle.\n",
      " |  \n",
      " |  __repr__(self, /)\n",
      " |      Return repr(self).\n",
      " |  \n",
      " |  __setattr__(self, name, value, /)\n",
      " |      Implement setattr(self, name, value).\n",
      " |  \n",
      " |  __setstate__(...)\n",
      " |  \n",
      " |  __str__(self, /)\n",
      " |      Return str(self).\n",
      " |  \n",
      " |  with_traceback(...)\n",
      " |      Exception.with_traceback(tb) --\n",
      " |      set self.__traceback__ to tb and return self.\n",
      " |  \n",
      " |  ----------------------------------------------------------------------\n",
      " |  Data descriptors inherited from BaseException:\n",
      " |  \n",
      " |  __cause__\n",
      " |      exception cause\n",
      " |  \n",
      " |  __context__\n",
      " |      exception context\n",
      " |  \n",
      " |  __dict__\n",
      " |  \n",
      " |  __suppress_context__\n",
      " |  \n",
      " |  __traceback__\n",
      " |  \n",
      " |  args\n",
      "\n"
     ]
    }
   ],
   "source": [
    "help(ZeroDivisionError)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Error Occured\n"
     ]
    }
   ],
   "source": [
    "try:\n",
    "    a = 10\n",
    "    print(\"Hi\" + a)\n",
    "    print(a/2)\n",
    "except ZeroDivisionError:\n",
    "    print(\"Do not Divide by Zero\")\n",
    "except (ValueError, TypeError):\n",
    "    print(\"Error Occured\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Something went wrong!\n"
     ]
    }
   ],
   "source": [
    "try:\n",
    "    w = \"String\"\n",
    "    print(w/0)\n",
    "except:\n",
    "    print(\"Something went wrong!\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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