python/keep_track.ipynb

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  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Keep Track while Looping\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
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    "ExecuteTime": {
     "end_time": "2020-07-31T16:34:49.358941Z",
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   "outputs": [],
   "source": [
    "friends = ['Ben', 'Kate', 'Thinh']"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
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     "end_time": "2020-07-31T16:34:56.448203Z",
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   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "0: Ben\n",
      "1: Kate\n",
      "2: Thinh\n"
     ]
    }
   ],
   "source": [
    "# Enumerate\n",
    "for i, item in enumerate(friends):\n",
    "    print(f'{i}: {item}')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2020-07-31T16:35:33.841276Z",
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   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "{0: 'Ben', 1: 'Kate', 2: 'Thinh'}"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# Dictionary comprehension\n",
    "{i: friends[i] for i in range(len(friends))}\n",
    "{0: 'Ben', 1: 'Kate', 2: 'Thinh'}"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Update New Dictionary Items"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2020-07-31T16:36:29.457784Z",
     "start_time": "2020-07-31T16:36:29.451343Z"
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   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "Counter({'love': 3, 'hate': 3, 'flower': 1})"
      ]
     },
     "execution_count": 8,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "from collections import Counter\n",
    "\n",
    "bag_words = Counter()\n",
    "\n",
    "sent1 = {'love': 1, 'hate': 3}\n",
    "bag_words.update(sent1)\n",
    "\n",
    "sent2 = {'love': 2, 'flower': 1}\n",
    "bag_words.update(sent2)\n",
    "\n",
    "bag_words"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2020-07-31T16:36:38.942788Z",
     "start_time": "2020-07-31T16:36:38.939384Z"
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   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "3"
      ]
     },
     "execution_count": 10,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "len(bag_words)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2020-07-31T16:36:43.360612Z",
     "start_time": "2020-07-31T16:36:43.357196Z"
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   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "7"
      ]
     },
     "execution_count": 11,
     "metadata": {},
     "output_type": "execute_result"
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   ],
   "source": [
    "sum(bag_words.values())"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Define Reusable Object with Namedtuple"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2020-07-31T16:37:40.865964Z",
     "start_time": "2020-07-31T16:37:40.860054Z"
    }
   },
   "outputs": [],
   "source": [
    "from collections import namedtuple\n",
    "\n",
    "Friend = namedtuple('Friend' , 'birthday food color introvert')\n",
    "\n",
    "Kate = Friend('Feb', 'cake', 'pink', True)\n",
    "Ben = Friend('Jan', 'fish', 'red', False)\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2020-07-31T16:37:58.026210Z",
     "start_time": "2020-07-31T16:37:58.022770Z"
    }
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "Friend(birthday='Feb', food='cake', color='pink', introvert=True)"
      ]
     },
     "execution_count": 17,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "Kate"
   ]
  },
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   "cell_type": "code",
   "execution_count": 18,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2020-07-31T16:37:59.797947Z",
     "start_time": "2020-07-31T16:37:59.791973Z"
    }
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "False"
      ]
     },
     "execution_count": 18,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "Ben.introvert"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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