Python爬取知乎图片代码实现解析

import requests
import re
import pymongo
import time
DATABASE_IP = '127.0.0.1'
DATABASE_PORT = 27017
DATABASE_NAME = 'sun'
client = pymongo.MongoClient(DATABASE_IP,DATABASE_PORT)
db = client.sun
db.authenticate("dba", "dba")
collection = db.zhihuone # 准备插入数据
BASE_URL = "https://www.zhihu.com/question/{}"
def get_totle_answers(article_id):
  headers = {
    "user-agent": "需要自己补全 Mozilla/5.0 (Windows NT 10.0; WOW64)"
  }
  with requests.Session() as s:
    with s.get(BASE_URL.format(article_id),headers=headers,timeout=3) as rep:
      html = rep.text
      pattern =re.compile( '<meta itemProp="answerCount" content="(\d*?)"/>')
      s = pattern.search(html)
      print("查找到{}条数据".format(s.groups()[0]))
      return s.groups()[0]
if __name__ == '__main__':
  # 用死循环判断用户输入的是否是数字
  article_id = ""
  while not article_id.isdigit():
    article_id = input("请输入文章ID：")
  totle = get_totle_answers(article_id)
  if int(totle)>0:
    zhi = ZhihuOne(article_id,totle)
    zhi.run()
  else:
    print("没有任何数据！")

  def download_img(self,data):
    ## 下载图片
    for item in data["data"]:
      content = item["content"]
      pattern = re.compile('<noscript>(.*?)</noscript>')
      imgs = pattern.findall(content)
      if len(imgs) > 0:
        for img in imgs:
          match = re.search('<img src="(.*?)"', img)
          download = match.groups()[0]
          download = download.replace("pic3", "pic2") # 小BUG,pic3的下载不到
          print("正在下载{}".format(download), end="")
          try:
            with requests.Session() as s:
              with s.get(download) as img_down:
                # 获取文件名称
                file = download[download.rindex("/") + 1:]
                content = img_down.content
                with open("imgs/{}".format(file), "wb+") as f: # 这个地方进行了硬编码
                  f.write(content)

                print("图片下载完成", end="\n")
          except Exception as e:
            print(e.args)
      else:
        pass