from bs4 import BeautifulSoup op=open("无.html","r") r1=op.read() html_bf=BeautifulSoup(r1,"lxml")代码解释
时间: 2024-01-11 12:03:29 浏览: 171
这段代码使用了Python的BeautifulSoup库,主要是用来解析HTML文档。
第一行代码导入了BeautifulSoup库,它是一个用于从HTML和XML文件中提取数据的Python库。
第二行代码打开了一个名为“无.html”的文件,并将其以只读方式读取。
第三行代码将读取的文件内容赋值给变量“r1”。
第四行代码调用BeautifulSoup类,将“r1”作为参数传递给它,并指定解析器为“lxml”。这意味着我们将使用lxml解析器来解析HTML文档。
最后,将解析后的HTML文档存储在变量“html_bf”中,可以使用BeautifulSoup库提供的各种方法和属性来操作解析后的文档。
相关问题
优化这段代码import requests from bs4 import BeautifulSoup url = "https://www.gupang.com/202305/64619.html" response = requests.get(url) soup = BeautifulSoup(response.content, "html.parser") title = soup.find("h1", class_="title").text content = soup.find("div", class_="content").text print(title) print(content)
可以使用以下方法进行优化:
1. 添加异常处理,以防止请求失败或解析失败导致程序崩溃:
```python
import requests
from bs4 import BeautifulSoup
url = "https://www.gupang.com/202305/64619.html"
try:
response = requests.get(url)
response.raise_for_status() # 抛出异常,如果请求失败
except requests.exceptions.RequestException as e:
print(e)
sys.exit(1)
soup = BeautifulSoup(response.content, "html.parser")
try:
title = soup.find("h1", class_="title").text
content = soup.find("div", class_="content").text
except AttributeError as e:
print(e)
sys.exit(1)
print(title)
print(content)
```
2. 使用`with`语句来管理资源,以确保在使用完文件或网络连接后自动释放资源:
```python
import requests
from bs4 import BeautifulSoup
url = "https://www.gupang.com/202305/64619.html"
try:
with requests.get(url) as response:
response.raise_for_status()
soup = BeautifulSoup(response.content, "html.parser")
title = soup.find("h1", class_="title").text
content = soup.find("div", class_="content").text
except (requests.exceptions.RequestException, AttributeError) as e:
print(e)
sys.exit(1)
print(title)
print(content)
```
这种方法可以避免手动关闭连接或文件,而且代码更加简洁。
修改代码,使得li_list的编码格式是utf-8import requests from bs4 import BeautifulSoup url = 'https://www.icbc.com.cn/page/827855918799994880.html' response = requests.get(url=url) page_response = response.text soup = BeautifulSoup(page_response, 'html.parser',from_encoding='utf-8') li_list = soup.select('#mypagehtmlcontent p')
import requests
from bs4 import BeautifulSoup
url = 'https://www.icbc.com.cn/page/827855918799994880.html'
response = requests.get(url=url)
page_response = response.content.decode('utf-8')
soup = BeautifulSoup(page_response, 'html.parser')
li_list = soup.select('#mypagehtmlcontent p')
# 以下为测试代码,可以不用理会
for li in li_list:
print(li.text)
阅读全文