01-02-pandas_dataframe_and_rows.ipynb

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    "## Syntax – Creating DataFrames\n",
    "[![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/corazzon/cracking-the-pandas-cheat-sheet/blob/master/01-02-pandas_dataframe_and_rows.ipynb)\n",
    "\n",
    "\n",
    "\n",
    "* https://pandas.pydata.org/Pandas_Cheat_Sheet.pdf\n",
    "\n",
    "* 튜토리얼 영상 : \n",
    "    * [1] 판다스 10분 완성소개, cheat sheet 보고 데이터프레임 만들어보기 https://youtu.be/lspu830SzC8\n",
    "\n",
    "    * [2] 판다스 데이터프레임 생성하고 데이터 가져오기 https://youtu.be/kdiO27ZuZJw"
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   "source": [
    "import pandas as pd"
   ]
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   "source": [
    "df = pd.DataFrame(\n",
    "        {\"a\" : [4 ,5, 6],\n",
    "        \"b\" : [7, 8, 9],\n",
    "        \"c\" : [10, 11, 12]},\n",
    "        index = [1, 2, 3])"
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    "df"
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   "source": [
    "df.loc[3, \"a\"]"
   ]
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   "source": [
    "df.loc[[1, 2], [\"a\", \"b\"]]"
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    "df = pd.DataFrame(\n",
    "        [[4, 7, 10],\n",
    "        [5, 8, 11],\n",
    "        [6, 9, 12]],\n",
    "        index=[1, 2, 3],\n",
    "        columns=['a', 'b', 'c'])\n",
    "df"
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   "cell_type": "code",
   "execution_count": null,
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    "import numpy as np\n",
    "df = pd.DataFrame(\n",
    "        {\"a\" : [4 ,5, 6, 6, np.nan],\n",
    "        \"b\" : [7, 8, np.nan, 9, 9],\n",
    "        \"c\" : [10, 11, 12, np.nan, 12]},\n",
    "        index = pd.MultiIndex.from_tuples(\n",
    "        [('d',1),('d',2),('e',2),('e',3),('e',4)],\n",
    "        names=['n','v']))\n",
    "df"
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