html - Python selenium webdriver not consistently selecting element even though it's there -

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i'm developing web scraper collect src link source tag in html file , add list.

the site has video nested under load of divs, of pages come to:

<video type="video/mp4" poster="someimagelink" preload="metadata" crossorigin="anonymous">     <source type="video/mp4" src="somemp4link"> </video>

my current method logging site, going page links video pages, going each video page 1 one , trying find source tag , adding list.

import time import requests bs4 import beautifulsoup selenium import webdriver  browser = webdriver.firefox()  # bunch of log in , list of video page links, works fine  soup = beautifulsoup(browser.page_source) in range(3):     browser.get(soup('a', {'class', 'subject__item'})[i]['href'])     vsoup = beautifulsoup(browser.page_source)     print(vsoup('source'))     browser.get('pagewithvideopages')      # doen't add list, goes video page,     # tries find source tag , print out.     # go original page , start loop again.

what happens this:

[<source src="themp4link" type="video/mp4"></source>] [] [] []

so first 1 works fine, rest return black lists...as if there no source tag, mannually checking inspector reveals there source tag there.

repeating this, get:

[<source src="http://themp4link" type="video/mp4"></source>] [] [<source src="http://themp4link" type="video/mp4"></source>]

the site needed javascript enabled load content (which why i'm using webdriver this)...could that?

any appreciated!

you need wait web element looking for. should explore using webdriverwait.


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