Python：黑板课爬虫闯关第一关

import re
import requests
import time


def main():
    url = 'http://www.heibanke.com/lesson/crawler_ex00/'
    get_next(url)


def get_next(url):
    print(url)
    html = requests.get(url).text
    m = re.search('(你需要在网址后输入数字|下一个你需要输入的数字是)(\d+)', html)
    if m:
        num = m.group(2)
        next_url = 'http://www.heibanke.com/lesson/crawler_ex00/' + num
        time.sleep(1)
        get_next(next_url)
    else:
        m = re.search('(?<=\<h3\>).*?(?=\</h3\>)', html)
        print(m.group())
        m = re.search('(\<).*?href="([^"]*?)".*?(\>下一关\</a\>)', html)
        print(f'下一关 http://www.heibanke.com{m.group(2)}')


if __name__ == '__main__':
    main()