GungnirAP/Youtube-Comments

1import requests2from requests.exceptions import MissingSchema3 4def extract_titles(url = "https://www.youtube.com/watch?v=CuSxk_DNau8&ab_channel=PeppaPigParodies"):5    try:6        page = requests.get(url)7    except MissingSchema as e:8        message = e.args[0]9        substr = '''No scheme supplied. '''10        message = message[:message.find(substr)] + message[message.find(substr) + len(substr):]11        raise RuntimeError(message)12    except Exception as e:13        message = f'''Invalid URL '{url}'. Please, try another one.'''14        raise RuntimeError(message)15 16    if not page.ok:17        message = '''This video isn't available.'''18        raise RuntimeError(message)19    20    try:21        txt = page.text22        title_start = '''meta name="title" content="'''23        pos = txt.find(title_start)24        if pos == -1:25            raise RuntimeError26        title = txt[pos + len(title_start):]27        title = title[:title.find('"')]28 29        channel_start = '''<link itemprop="name" content="'''30        pos = txt.find(channel_start)31        if pos == -1:32            raise RuntimeError33        channel = txt[pos + len(channel_start):]34        channel = channel[:channel.find('"')]35    except Exception as e:36        message = '''Can't detect channel or video title.\nPlease, try another link.'''37        raise RuntimeError(message)38 39    return channel, title