def site_name(self, site_name):
        """Function that sets and checks the site name and set url.

        Parameters:
            site_name (str): The site name in 'SITE_LIST', default sites.

        Raises:
            PybooruError: When 'site_name' isn't valid.
        """
        if site_name in SITE_LIST:
            self.__site_name = site_name
            self.__site_url = SITE_LIST[site_name]['url']
        else:
            raise PybooruError(
                "The 'site_name' is not valid, specify a valid 'site_name'.")
Function that sets and checks the site name and set url.

        Parameters:
            site_name (str): The site name in 'SITE_LIST', default sites.

        Raises:
            PybooruError: When 'site_name' isn't valid.