python黒板授業爬虫類突破-第一関門

#!/usr/bin/python
# -*- coding:utf-8 -*-
# Author: LiTianle
# Time:2019/9/24 15:36
'''
           53639
            10963. 
'''
import requests,re
    
def get_num(s):
    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',
    }
    ex = '
.*   ?(\d+)'
    #       
    page_text = requests.get(url=s, headers=headers).text
    result=re.findall(ex, page_text, re.S)
    if result:
        #     
        num = result[0]
        #    url
        URL = 'http://www.heibanke.com/lesson/crawler_ex00/' + num
        print(URL)
        return get_num(URL)
    else:
        print('    ，   ：http://www.heibanke.com'+re.findall('',page_text,re.S)[0])
if __name__ == '__main__':
url = 'http://www.heibanke.com/lesson/crawler_ex00/'
get_num(url)