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    "## 南瓜定價\n",
    "\n",
    "載入所需的函式庫和數據集。將數據轉換為包含部分數據的資料框：\n",
    "\n",
    "- 僅選取以蒲式耳定價的南瓜\n",
    "- 將日期轉換為月份\n",
    "- 計算價格為高價和低價的平均值\n",
    "- 將價格轉換為反映每蒲式耳數量的定價\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import pandas as pd\n",
    "import matplotlib.pyplot as plt\n",
    "import numpy as np\n",
    "from datetime import datetime\n",
    "\n",
    "pumpkins = pd.read_csv('../data/US-pumpkins.csv')\n",
    "\n",
    "pumpkins.head()\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "pumpkins = pumpkins[pumpkins['Package'].str.contains('bushel', case=True, regex=True)]\n",
    "\n",
    "columns_to_select = ['Package', 'Variety', 'City Name', 'Low Price', 'High Price', 'Date']\n",
    "pumpkins = pumpkins.loc[:, columns_to_select]\n",
    "\n",
    "price = (pumpkins['Low Price'] + pumpkins['High Price']) / 2\n",
    "\n",
    "month = pd.DatetimeIndex(pumpkins['Date']).month\n",
    "day_of_year = pd.to_datetime(pumpkins['Date']).apply(lambda dt: (dt-datetime(dt.year,1,1)).days)\n",
    "\n",
    "new_pumpkins = pd.DataFrame(\n",
    "    {'Month': month, \n",
    "     'DayOfYear' : day_of_year, \n",
    "     'Variety': pumpkins['Variety'], \n",
    "     'City': pumpkins['City Name'], \n",
    "     'Package': pumpkins['Package'], \n",
    "     'Low Price': pumpkins['Low Price'],\n",
    "     'High Price': pumpkins['High Price'], \n",
    "     'Price': price})\n",
    "\n",
    "new_pumpkins.loc[new_pumpkins['Package'].str.contains('1 1/9'), 'Price'] = price/1.1\n",
    "new_pumpkins.loc[new_pumpkins['Package'].str.contains('1/2'), 'Price'] = price*2\n",
    "\n",
    "new_pumpkins.head()\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "基本散佈圖提醒我們，我們只有從八月到十二月的月份數據。我們可能需要更多數據才能以線性方式得出結論。\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import matplotlib.pyplot as plt\n",
    "plt.scatter('Month','Price',data=new_pumpkins)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "\n",
    "plt.scatter('DayOfYear','Price',data=new_pumpkins)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "\n---\n\n**免責聲明**：  \n本文件已使用 AI 翻譯服務 [Co-op Translator](https://github.com/Azure/co-op-translator) 進行翻譯。雖然我們致力於提供準確的翻譯，但請注意，自動翻譯可能包含錯誤或不準確之處。應以原始語言的文件作為權威來源。對於關鍵資訊，建議尋求專業人工翻譯。我們對因使用此翻譯而引起的任何誤解或誤釋不承擔責任。\n"
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