Python3 黑板客爬虫闯关第一关

      #coding=utf-8
      import re
      import requests
      from requests.exceptions import RequestException
      from bs4 import BeautifulSoup
      def getHtml(url):
      try:
       headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0'}
       response = requests.get(url,headers = headers)
      if response.status_code == 200:
      return response.text
      return None
      except RequestException:
      return None
      if __name__=='__main__':
       start_url = "http://www.heibanke.com/lesson/crawler_ex00/"
       real_url = start_url
      while 1:#while 1 的运行速度比while True 要快那么一点
      print ("当前请求页面:{}".format(real_url))
       html = getHtml(real_url)
       soup = BeautifulSoup(html,"lxml")
       source =soup.select_one('h3').text
       num = re.findall('\d+',source)
      if len(num) == 0:
      break
       real_url =  start_url + num[0]
  
 

考察点：url的拼接，BeautifulSoup库及正则表达式库的使用。

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原文链接：blog.csdn.net/qq523176585/article/details/83019159