import requests


class TiebaSpider(object):
  def __init__(self, tieba_name): # tieba_name为要爬取贴吧的名称
    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 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36',
    }

  def get_url_list(self): # 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)] # 列表推导式替换上面代码

  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: # 样例： 李毅-第一页.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('李毅')
  tieba_spider.run()