input: from typing import List, Tuple
  
  import requests
  import re
  
  def extract_youtube_video_titles(url: str) -> List[Tuple[str, str]]:
      """ Extracts titles and video IDs of all YouTube videos from a given URL.
      >>> extract_youtube_video_titles("https://www.youtube.com/user/Thexvid/videos")
      [('VIDEO_ID_1', 'Title 1'), ('VIDEO_ID_2', 'Title 2')]
      """
      r = requests.get(url)
      titles = re.findall('<a href="/watch\\?v=([^"]+)">(.+?)</a>', r.content.decode('utf-8'))
      return titles
  
output:     r = requests.get(url)
      titles = re.findall('<a href="/watch\\?v=([^"]+)">(.+?)</a>', r.content.decode('utf-8'))
      return titles