notebook/1-1-urllib.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Simplest scraping\n",
    "**We gonna show how to open a very simple [webpage](https://mofanpy.com/static/scraping/basic-structure.html), and read all the content in it.**"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "collapsed": true
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "<!DOCTYPE html>\n<html lang=\"cn\">\n<head>\n\t<meta charset=\"UTF-8\">\n\t<title>Scraping tutorial 1 | 莫烦Python</title>\n\t<link rel=\"icon\" href=\"https://mofanpy.com/static/img/description/tab_icon.png\">\n</head>\n<body>\n\t<h1>爬虫测试1</h1>\n\t<p>\n\t\t这是一个在 <a href=\"https://mofanpy.com/\">莫烦Python</a>\n\t\t<a href=\"https://mofanpy.com/tutorials/scraping\">爬虫教程</a> 中的简单测试.\n\t</p>\n\n</body>\n</html>\n"
     ]
    }
   ],
   "source": [
    "from urllib.request import urlopen\n",
    "\n",
    "# if has Chinese, apply decode()\n",
    "html = urlopen(\"https://mofanpy.com/static/scraping/basic-structure.html\").read().decode('utf-8')\n",
    "print(html)\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Then we select some text according to the tag arround text using regular expression**"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "\nPage title is:  Scraping tutorial 1 | 莫烦Python\n"
     ]
    }
   ],
   "source": [
    "import re\n",
    "res = re.findall(r\"<title>(.+?)</title>\", html)\n",
    "print(\"\\nPage title is: \", res[0])"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Another example to select paragraph content out of html.**"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "\nPage paragraph is:  \n\t\t这是一个在 <a href=\"https://mofanpy.com/\">莫烦Python</a>\n\t\t<a href=\"https://mofanpy.com/tutorials/scraping\">爬虫教程</a> 中的简单测试.\n\t\n"
     ]
    }
   ],
   "source": [
    "res = re.findall(r\"<p>(.*?)</p>\", html, flags=re.DOTALL)    # re.DOTALL if multi line\n",
    "print(\"\\nPage paragraph is: \", res[0])"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**And select links using regex**"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "\nAll links:  ['https://mofanpy.com/static/img/description/tab_icon.png', 'https://mofanpy.com/', 'https://mofanpy.com/tutorials/scraping']\n"
     ]
    }
   ],
   "source": [
    "res = re.findall(r'href=\"(.*?)\"', html)\n",
    "print(\"\\nAll links: \", res)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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