Python爬虫新手教程： 知乎文章图片爬取器

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