问题描述
我正在尝试使用BeautifulSoup从网页中提取表格的HTML代码.
I'm trying to extract the HTML code of a table from a webpage using BeautifulSoup.
<table class="facts_label" id="facts_table">...</table>
如果我将"lxml"更改为"html.parser"，我想知道为什么代码下面的代码与"html.parser"一起工作并打印回none.
I would like to know why the code bellow works with the "html.parser" and prints back none if I change "html.parser" for "lxml".
#! /usr/bin/python
from bs4 import BeautifulSoup
from urllib import urlopen
webpage = urlopen('http://www.thewebpage.com')
soup=BeautifulSoup(webpage, "html.parser")
table = soup.find('table', {'class' : 'facts_label'})
print table
推荐答案
BeautifulSoup文档中有一个特殊段落，称为解析器之间的差异，其中指出:
There is a special paragraph in BeautifulSoup documentation called Differences between parsers, it states that:
在格式不正确的HTML文档中，差异显而易见.
The differences become clear on non well-formed HTML documents.
其道理是，您应该使用在特定情况下有效的解析器.
The moral is just that you should use the parser that works in your particular case.
还请注意，您应该始终明确指定要使用的解析器.这将帮助您避免在不同的计算机或虚拟环境上运行代码时出现意外.
Also note that you should always explicitly specify which parser are you using. This would help you to avoid surprises when running the code on different machines or virtual environments.
这篇关于美丽的汤和餐桌刮面-LXML与HTML解析器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！