python爬虫怎么爬取前几页
使用 python 爬虫爬取前几页内容涉及以下步骤:1.导入请求和 beautifulsoup 库;2.构造一个 http 请求;3.解析响应为 html 文档;4.使用循环遍历前几页,提取内容并打印;5.构造下一页 url 并发送 http 请求;6.解析下一页 html 文档并更新 soup 变量;7.循环结束,爬取完成。
如何使用 Python 爬虫爬取前几页内容
步骤 1:导入必要的库
import requestsfrom bs4 import BeautifulSoup
步骤 2:构造一个 HTTP 请求
url = "example."response = requests.get(url)
步骤 3:将响应解析为 HTML
soup = BeautifulSoup(response.text, "html.parser")
步骤 4:遍历前几页
page_num = 1while page_num <= 5: # 爬取前 5 页 # 提取当前页面的内容 content = soup.find_all("div", class_="content") # 打印提取到的内容 print(f"第 {page_num} 页:") print(content) # 构造下一页的 URL next_page_url = f"{url}/page/{page_num + 1}" # 发送下一页的 HTTP 请求 next_page_response = requests.get(next_page_url) # 解析下一页的 HTML soup = BeautifulSoup(next_page_response.text, "html.parser") page_num += 1
示例代码:
import requestsfrom bs4 import BeautifulSoup# 爬取百度首页前 5 页的内容url = “www.baidu.”response = requests.get(url)soup = BeautifulSoup(response.text, "html.parser")page_num = 1while page_num <= 5: content = soup.find_all("div", class_="result") print(f"第 {page_num} 页:") print(content) next_page_url = f"{url}/s?wd=&pn={page_num * 10}" next_page_response = requests.get(next_page_url) soup = BeautifulSoup(next_page_response.text, "html.parser") page_num += 1
以上就是python爬虫怎么爬取前几页的详细内容,更多请关注范的资源库其它相关文章!
转载请注明:范的资源库 » python爬虫怎么爬取前几页