Day009_HW.ipynb

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   "source": [
    "# 作業\n",
    "\n",
    "以正確的副檔名下載網頁中的圖片\n",
    "範例網頁:https://www.ptt.cc/bbs/Beauty/M.1556291059.A.75A.html\n",
    "\n",
    "Note：因為 PTT 會詢問「是否滿 18 歲」，這邊可以用 cookies 繞過\n",
    "\n",
    "`requests.get(URL, cookies={'over18': '1'}`\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 29,
   "metadata": {},
   "outputs": [],
   "source": [
    "import requests\n",
    "import os\n",
    "\n",
    "from bs4 import BeautifulSoup\n",
    "from PIL import Image"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 30,
   "metadata": {},
   "outputs": [],
   "source": [
    "url = 'https://www.ptt.cc/bbs/Beauty/M.1556291059.A.75A.html'\n",
    "resp = requests.get(url, cookies={'over18': '1'})\n",
    "soup = BeautifulSoup(resp.text)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 31,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[<a href=\"//imgur.com/Cgb5oo1\"></a>]\n",
      "Save image ./downloads/Cgb5oo1.jpeg\n"
     ]
    }
   ],
   "source": [
    "# 決定要儲存的資料夾\n",
    "output_dir = './downloads'\n",
    "\n",
    "# 假如資料夾不存在就新增一個資料夾\n",
    "# if not os.path.exists(output_dir):\n",
    "#     os.makedirs(output_dir)\n",
    "\n",
    "if not os.path.exists(output_dir):\n",
    "    os.makedirs(output_dir)\n",
    "\n",
    "# 定位所有圖片的 tag\n",
    "image_tags = soup.find(class_=\"richcontent\").findChildren(\"a\")\n",
    "print(image_tags)\n",
    "for img_tag in image_tags:\n",
    " # 取得所有圖片在第三方服務的 id\n",
    "    if \"imgur\" not in img_tag[\"href\"]:\n",
    "        continue\n",
    "    # 組合圖片而非網站的網址\n",
    "    img_id = img_tag['href'].split('/')[-1]\n",
    "    img_url=\"https://i.imgur.com/{}.jpg\".format(img_id) #()為填滿{}參數\n",
    "#     對圖片送出請求\n",
    "    with requests.get(img_url,stream=True) as r:\n",
    "        r.raise_for_status()\n",
    "        img=Image.open(r.raw)\n",
    "        img_savename = '{outdir}/{img_id}.{img_ext}'.format(\n",
    "        outdir=output_dir, img_id=img_id, img_ext=img.format.lower())\n",
    "        img.save(img_savename)\n",
    "        print('Save image {}'.format(img_savename))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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