def banner_url_as(self, *, format='<STR_LIT>', size=<NUM_LIT>):
return Asset._from_guild_image(self._state, self.id, self.banner, '<STR_LIT>', format=format, size=size)<EOL>
Returns a friendly URL version of the guild's banner. Returns an empty string if it has no banner.

        The format must be one of 'webp', 'jpeg', or 'png'. The
        size must be a power of 2 between 16 and 4096.

        Parameters
        -----------
        format: :class:`str`
            The format to attempt to convert the banner to.
        size: :class:`int`
            The size of the image to display.

        Raises
        ------
        InvalidArgument
            Bad image format passed to ``format`` or invalid ``size``.

        Returns
        --------
        :class:`Asset`
            The resulting CDN asset.