16_oop(Special (Magic or Dunder) Methods).ipynb

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   "source": [
    "class Employee:\n",
    "    num_of_emps = 0\n",
    "    raise_amount = 1.04\n",
    "\n",
    "    def __init__(self, first, last, pay):\n",
    "        self.first = first\n",
    "        # self.fn = first\n",
    "        self.last = last\n",
    "        self.pay = pay\n",
    "        self.email = first + '.' + last + '@gmail.com'\n",
    "        Employee.num_of_emps += 1\n",
    "        \n",
    "    def fullname(self):\n",
    "        return '{} {}'.format(self.first, self.last)\n",
    "    \n",
    "    def apply_raise(self):\n",
    "        self.pay = int(self.pay * Employee.raise_amount)\n",
    "        \n",
    "    def __repr__(self):\n",
    "        return \"Employee('{}', '{}', '{}')\".format(self.first, self.last, self.pay)\n",
    "    \n",
    "    def __str__(self):\n",
    "        return '{} - {} '.format(self.fullname(), self.email)\n",
    "    \n",
    "    def __add__(self, other):\n",
    "        return self.pay + other.pay\n",
    "    \n",
    "    def __len__(self):\n",
    "        return len(self.fullname())"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "emp_1 = Employee('Aram', 'Rostamitabar', 2400)\n",
    "emp_2 = Employee('Hana', 'Batmani', 4500)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "3\n",
      "ab\n"
     ]
    }
   ],
   "source": [
    "print(1 + 2)\n",
    "print('a' + 'b')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Aram Rostamitabar - Aram.Rostamitabar@gmail.com \n"
     ]
    }
   ],
   "source": [
    "\n",
    "print(emp_1)\n",
    "# lets fix this"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Employee('Aram', 'Rostamitabar', '2400')\n",
      "Aram Rostamitabar - Aram.Rostamitabar@gmail.com \n"
     ]
    }
   ],
   "source": [
    "print(repr(emp_1))\n",
    "print(str(emp_1))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Employee('Aram', 'Rostamitabar', '2400')\n",
      "Aram Rostamitabar - Aram.Rostamitabar@gmail.com \n"
     ]
    }
   ],
   "source": [
    "print(emp_1.__repr__())\n",
    "print(emp_1.__str__())"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "3\n",
      "3\n"
     ]
    }
   ],
   "source": [
    "print(1 + 2)\n",
    "print(int.__add__(1, 2))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "ab\n",
      "ab\n"
     ]
    }
   ],
   "source": [
    "print('a' + 'b')\n",
    "print(str.__add__('a', 'b'))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "6900\n"
     ]
    }
   ],
   "source": [
    "# try it without __add__\n",
    "print(emp_1 + emp_2)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "3\n",
      "3\n"
     ]
    }
   ],
   "source": [
    "print(len('try'))\n",
    "print('try'.__len__())"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "17\n"
     ]
    }
   ],
   "source": [
    "print(len(emp_1))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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