为什么requests.get（）使用Python比浏览器检索不同的HTML？

问题描述

我试图从HTML表格中提取数据，但是看起来在使用 requests.get（）时HTML没有正确加载。相反，源文件中的一行代码如下所示：

当我导航到谷歌浏览器中的页面时，HTML应该显示为它。

如何获得一个Python脚本来加载正确的HTML？

解决方案

欢迎来到奇妙的网络爬行世界。您遇到的问题是 requests.get（）只会让您获得浏览器在页面加载开始时接收到的初始页面。但是，这不是你在浏览器中看到的页面，因为可能涉及到很多形成网页：JavaScript函数调用，AJAX调用等。

如果你想要以编程方式获取在页面加载后单击Web浏览器中的显示源时看到的HTML - 您需要一个真正的浏览器。这是可能是一个不错的选择：

 来自selenium import webdriver 
 
 browser = webdriver.Firefox（）
 browser.get（url）
 print browser.page_source 
  

请注意 selenium 本身在方面非常强大 - 您不需要单独的HTML解析器将数据从页面中提取出来。

希望有帮助。

I am attempting to extract data from an HTML table, but it appears that the HTML isn't loading correctly when using requests.get(). Instead, a line in the source reads:

When I navigate to the page in Google Chrome, the HTML appears as it should.

How do I get a Python script to load the proper HTML?

解决方案

Welcome to the wonderful world of web-crawling. The problem you are experiencing is that requests.get() would just get you the initial page that the browser receives at the beginning of a page load. But, this is not the page you see in the browser since there could be so much involved in forming the web page: javascript function calls, AJAX calls etc.

If you want to programmatically get the HTML you see when you click "Show source" in a web browser after the page was loaded - you would need a real browser. This is there selenium could be a good option:

from selenium import webdriver

browser = webdriver.Firefox()
browser.get(url)
print browser.page_source

Note that selenium itself is very powerful in terms of locating elements - you don't need a separate HTML parser for extracting the data out of the page.

Hope that helps.

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