牛客网题库爬虫

完整代码

import requests
from urllib.parse import urlencode
from multiprocessing.pool import Pool
from lxml import etree

headers = {
    'accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3',
    'accept-encoding': 'gzip, deflate, br',
    'accept-language': 'zh-CN,zh;q=0.9',
    'user-agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36'
}


def get_page(page):
    params = {
        'tpId': '80',
        'tqId': str(29677 + int(page)),
        'query': '',
        'asc': 'true',
        'order': '',
        'page': page  # 1 begin
    }
    base_url = 'https://www.nowcoder.com/ta/review-frontend/review?'
    url = base_url + urlencode(params)
    f = open('save.md','a+', encoding='utf-8')
    try:
        resp = requests.get(url, headers=headers)
        print (url)
        if resp.status_code == 200:
            selector = etree.HTML(resp.text)
            question = '### ' + str(page) + '、' + ''.join(selector.xpath('/html/body/div[1]/div[2]/div[2]/div[1]/div[2]//text()')).replace('
','').strip() + '
'
            answer = selector.xpath('/html/body/div[1]/div[2]/div[2]/div[2]/div[1]//text()')
            answer = "".join(answer)
            answer = '```
' + answer.replace('
','').strip() + '
```
'
            f.write(question + answer)
            f.close()
    except Exception as e:
        print (e)


def main(page):
    get_page(page)


if __name__ == '__main__':
    # pool = Pool()
    # pool.map(main, [i for i in range(1,501)])
    # pool.close()
    # pool.join()
     for i in range(1,501):
        main(i)

修改事项

打开元素审查

headers

headers = {
    'accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3',
    'accept-encoding': 'gzip, deflate, br',
    'accept-language': 'zh-CN,zh;q=0.9',
    'user-agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36'
}

浏览器对照key值修改value就行。

params

参数设置参考

通过观察可以看到：tqld = 29677+page

    params = {
        'tpId': '80',
        'tqId': str(29677 + int(page)),
        'query': '',
        'asc': 'true',
        'order': '',
        'page': page  # 1 begin
    }

base_url

如果不介意题目顺序，可以把多线程的注释取消。

效果