extracting youtube video id from youtube URL

from urllib.parse import urlparse, parse_qs


urltext = 'https://www.youtube.com/watch?v=T99Ng11MPdY'

def extract_video_id(url):
    query = urlparse(url)
    if query.hostname == 'youtu.be': return query.path[1:]
    if query.hostname in {'www.youtube.com', 'youtube.com'}:
        if query.path == '/watch': return parse_qs(query.query)['v'][0]
        if query.path[:7] == '/embed/': return query.path.split('/')[2]
        if query.path[:3] == '/v/': return query.path.split('/')[2]
    # fail?
    return None

if __name__ == "__main__":

    args = [urltext]
    video_id = ''

    for url in args:
        video_id = (extract_video_id(url))
        print(video_id)