def dropbox_basename(url):
    """ Strip off the dl=0 suffix from dropbox links
    
    >>> dropbox_basename('https://www.dropbox.com/s/yviic64qv84x73j/aclImdb_v1.tar.gz?dl=1')
    'aclImdb_v1.tar.gz'
    """
    filename = os.path.basename(url)
    match = re.findall(r'\?dl=[0-9]$', filename)
    if match:
        return filename[:-len(match[0])]
    return filename