def url(self, **kwargs):
url = self.file['<STR_LIT:url>']<EOL>args = ['<STR_LIT>'.format(k, v) for k, v in kwargs.items()]<EOL>if args:<EOL><INDENT>url += '<STR_LIT>'.format('<STR_LIT:&>'.join(args))<EOL><DEDENT>return url<EOL>
Returns a formatted URL for the Asset's File
        with serialized parameters.

        Usage:
            >>> my_asset.url()
            "//images.contentful.com/spaces/foobar/..."
            >>> my_asset.url(w=120, h=160)
            "//images.contentful.com/spaces/foobar/...?w=120&h=160"