from bs4 import BeautifulSoup


def parse_page_snap(page):
    """Parses a Debian Snapshot HTML page and parses the sources URLs.
    """
    urls = []
    html = BeautifulSoup(page, 'html.parser')
    source_files = html.select('dl')[0]
    for source in source_files.select('dd'):
        for block in source.select('dl'):
            urls.append(block.select('a')[0]['href'])
    return urls