@property
    def embed_url(self):
        """HTML5 embed url."""
        if self.video_id:
            return self.video_id % 'http://www.youtube.com/embed/%s?wmode=transparent'
        return None
dataset/ETHPy150Open python/raspberryio/raspberryio/project/models.py/ProjectStep.embed_url/swapped operands of `%`