无法使用xpath获取youtube视频的时长 [英] Failing to get duration of youtube video using xpath

问题描述

我想写点东西，让我返回youtube链接的视频时长.因此，我找到了requests和lxml，并按照此开始a>指南.

I wanted to write something that would return me the video duration of a youtube link. So I found requests and lxml and started out following this guide.

这是设置:

import requests
from lxml import html

url = 'https://www.youtube.com/watch?v=EN8fNb6uhns'
page = requests.get(url)
tree = html.fromstring(page.content)

然后我尝试使用xpath来获取持续时间，但是它不起作用.尝试获取持续时间:

Then I try and use xpath to get the duration, but it doesn't work. Trying to get the duration:

tree.xpath('//span[@class="ytp-time-duration"]/text()')

返回一个空列表.但是，当我尝试通过以下方式获得标题(作为测试)时:

returns an empty list. But when I try and get the title (as a test) with:

tree.xpath('//h1[@class="watch-title-container"]/span/text()')

有效.当我使用校对来复制duration元素的xpath时，什么也没有返回:

it works. When I use inspect to copy the xpath of the duration element nothing is returned:

tree.xpath('/html/body/div[2]/div[4]/div/div[4]/div[2]/div[2]/div/div[24]/div[2]/div[1]/div/span[3]')

当我为标题做同样的事情时，它又可以工作了.

When I do the same for the title it works again.

这是怎么回事?

推荐答案

span[@class="ytp-time-duration"]

此span标记是由JavaScript生成的，它不会由requests返回，requests仅返回HTML代码

this span tag is generated by JavaScript, and it will not returned by requests, requests just return the HTML code

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