python爬虫学习04-爬取贴吧

百度贴吧网页爬取

如下是代码

from urllib.request import urlopen
from urllib.request import Request
from urllib.parse import urlencode
from fake_useragent import UserAgent

def get_html(url):
    # 随机获取一个动态ua
    headers = {
        "User-Agent": UserAgent().random
    }
    # 发起请求
    request = Request(url, headers=headers)
    # urlopen()获取页面，类型是字节，须要用decode()解码，转换成str类型
    respose = urlopen(request)
    return respose.read()

def save_html(filename,html_bytes):
    with open(filename,"wb") as f:
        f.write(html_bytes)

def main():
    content = input(print("请输入你要下载的内容："))
    num = input(print("请输入你要下载多少页："))
    base_url = "https://tieba.baidu.com/f?ie=utf-8{}"
    for pn in range(int(num)):
        args = {
            "pn":pn*50,
            "kw":content
        }
        filename = "第"+str(pn+1)+"页.html"
        args = urlencode(args)
        print("正在下载"+filename)
        html_bytes = get_html(base_url.format(args))
        save_html(filename,html_bytes)

if __name__ == '__main__':
    main()