python_practice_3_Ordered_dict.ipynb

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 "cells": [
  {
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   "metadata": {},
   "source": [
    "## OrderedDict 불러오기"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 24,
   "metadata": {
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   "outputs": [],
   "source": [
    "from collections import OrderedDict"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 딕셔너리와 OrderedDict의 차이점"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 45,
   "metadata": {
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     "end_time": "2020-09-24T12:37:46.800906Z",
     "start_time": "2020-09-24T12:37:46.790966Z"
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   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "{'d': 1, 'a': 1, 'c': 2, 'b': 3}"
      ]
     },
     "execution_count": 45,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "di = dict()\n",
    "di['d'] = 1\n",
    "di['a'] = 1\n",
    "di['c'] = 2\n",
    "di['b'] = 3\n",
    "di"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 46,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2020-09-24T12:37:55.663981Z",
     "start_time": "2020-09-24T12:37:55.654722Z"
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   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "OrderedDict([('a', 1), ('c', 2), ('b', 3)])"
      ]
     },
     "execution_count": 46,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "or_di = OrderedDict()\n",
    "or_di['a'] = 1\n",
    "or_di['c'] = 2\n",
    "or_di['b'] = 3\n",
    "or_di"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### popitem 메서드"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 32,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2020-09-24T12:22:00.206036Z",
     "start_time": "2020-09-24T12:22:00.198249Z"
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   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "OrderedDict([('a', 1), ('c', 2), ('b', 3)])"
      ]
     },
     "execution_count": 32,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "or_di"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 33,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2020-09-24T12:22:00.845217Z",
     "start_time": "2020-09-24T12:22:00.838068Z"
    }
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "('b', 3)"
      ]
     },
     "execution_count": 33,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "or_di.popitem()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 34,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2020-09-24T12:22:01.085741Z",
     "start_time": "2020-09-24T12:22:01.077878Z"
    }
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "('a', 1)"
      ]
     },
     "execution_count": 34,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "or_di.popitem(last=False)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 35,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2020-09-24T12:22:01.515095Z",
     "start_time": "2020-09-24T12:22:01.507929Z"
    }
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "OrderedDict([('c', 2)])"
      ]
     },
     "execution_count": 35,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "or_di"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### move_to_end 메서드"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 42,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2020-09-24T12:29:24.969931Z",
     "start_time": "2020-09-24T12:29:24.964002Z"
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   },
   "outputs": [],
   "source": [
    "or_di = OrderedDict(zip('abcde',range(4)))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 43,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2020-09-24T12:29:25.167335Z",
     "start_time": "2020-09-24T12:29:25.159482Z"
    }
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "OrderedDict([('b', 1), ('c', 2), ('d', 3), ('a', 0)])"
      ]
     },
     "execution_count": 43,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "or_di.move_to_end('a')\n",
    "or_di"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 44,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2020-09-24T12:29:25.437012Z",
     "start_time": "2020-09-24T12:29:25.429218Z"
    }
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "OrderedDict([('a', 0), ('b', 1), ('c', 2), ('d', 3)])"
      ]
     },
     "execution_count": 44,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "or_di.move_to_end('a',last=False)\n",
    "or_di"
   ]
  }
 ],
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