def site(url, site_number=None):
    """ Returns the site which the url is of. """
    if site_number is not None:
        site_number = int(site_number)
    if "panda" in url or site_number is 1:
        return "Mangapanda"
    elif "mangasee" in url or site_number is 2:
        return "Mangasee"
    else:
        raise Exception("Site Not Supported. See Help / Readme.md for Supported sites.")