Lec3.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "6"
      ]
     },
     "execution_count": 1,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "(3).__add__(3)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "class Triple:\n",
    "    def __init__(self, num1, num2, num3):\n",
    "        self.nums = num1, num2, num3"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "<__main__.Triple at 0x2ae82c46ac8>"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "Triple(1, 2, 3)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "The string representation of our class is not really informative. We can fix this by implementing __ repr __."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [],
   "source": [
    "class Triple:\n",
    "    def __init__(self, num1, num2, num3):\n",
    "        self.nums = num1, num2, num3\n",
    "        \n",
    "    def __repr__(self):\n",
    "        \"\"\"A string represntation for inspecting objects at runtime. \"\"\"\n",
    "        return \"Triple(\" + str(self.nums[0]) + \", \" + str(self.nums[1]) + \", \" + str(self.nums[2]) + \")\""
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "Triple(1, 2, 3)"
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "Triple(1, 2, 3)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "To make addition between Triples possible, we have to implement __ add __. We define the addition Triples just as the elementwise addition of the three numbers."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [],
   "source": [
    "class Triple:\n",
    "    def __init__(self, num1, num2, num3):\n",
    "        self.nums = num1, num2, num3\n",
    "        \n",
    "    def __repr__(self):\n",
    "        \"\"\"A string representation for inspecting objects at runtime.\"\"\"\n",
    "        return \"Triple(\" + str(self.nums[0]) + \", \" + str(self.nums[1]) + \", \" + str(self.nums[2]) + \")\"\n",
    "    \n",
    "    def __add__(self, other):\n",
    "        num1 = self.nums[0] + other.nums[0]\n",
    "        num2 = self.nums[1] + other.nums[1]\n",
    "        num3 = self.nums[2] + other.nums[2]\n",
    "        return Triple(num1, num2, num3)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [],
   "source": [
    "a = Triple(1, 2, 3)\n",
    "b = Triple(2, 3, 4)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Triple(3, 5, 7)\n",
      "Triple(3, 5, 7)\n",
      "Triple(3, 5, 7)\n"
     ]
    }
   ],
   "source": [
    "print(a + b)\n",
    "print(a.__add__(b))\n",
    "print(Triple.__add__(a,b))"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Iterables and Iterators"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {},
   "outputs": [],
   "source": [
    "class Myrange:\n",
    "    def __init__(self,n):\n",
    "        self.i = 0\n",
    "        self.n = n\n",
    "        \n",
    "    def __iter__(self):\n",
    "        return self\n",
    "    \n",
    "    def __next__(self):\n",
    "        if self.i < self.n:\n",
    "            self.i += 1\n",
    "            return self.i\n",
    "        else:\n",
    "            raise StopIteration()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "1\n",
      "2\n",
      "3\n",
      "4\n",
      "5\n"
     ]
    }
   ],
   "source": [
    "for i in Myrange(5):\n",
    "    print(i)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "10\n",
      "20\n",
      "30\n"
     ]
    }
   ],
   "source": [
    "a_list = [10, 20, 30]\n",
    "for number in a_list:\n",
    "    print(number)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Python 3",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.7.2"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 2
}