1.4举个栗子——爬起lol贴吧网页源码（可以修改爬取贴吧名字）

#coding:utf-8
#file: tieba.py
#@author: young
#@contact: [email protected]
#@time: 2019/12/22 14:44
# coding=utf-8
import requests

class TiebaSpider:
    def __init__(self, tieba_name):
        self.tieba_name = tieba_name
        self.url_temp = "https://tieba.baidu.com/f?kw=" + tieba_name + "&ie=utf-8&pn={}"
        self.headers = {
            "User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.84 Safari/537.36"}

    def get_url_list(self):  # 1.构造url列表
         url_list = []
         for i in range(1000):
             url_list.append(self.url_temp.format(i*50))
         return url_list
        # return [self.url_temp.format(i * 50) for i in range(1000)]

    def parse_url(self, url):  # 发送请求，获取响应
        # print(url)
        response = requests.get(url, headers=self.headers)
        return response.content.decode()

    def save_html(self, html_str, page_num):  # 保存html字符串
        file_path = "{}—第{}页.html".format(self.tieba_name, page_num)
        with open(file_path, "w", encoding="utf-8") as f:  # "李毅—第4页.html"
            f.write(html_str)

    def run(self):  # 实现主要逻辑
        # 1.构造url列表
        url_list = self.get_url_list()
        # 2.遍历，发送请求，获取响应
        for url in url_list:
            html_str = self.parse_url(url)
            # 3.保存
            page_num = url_list.index(url) + 1  # 页码数
            self.save_html(html_str, page_num)

if __name__ == '__main__':
    tieba_spider = TiebaSpider("lol")
    tieba_spider.run()

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