':return: çšæ·å€Žåurl
:rtype: str'

@property
@check_soup('_photo_url', '_make_card')
def photo_url(self):

    if (self.url is not None):
        if (self.soup is not None):
            img = self.soup.find('img', class_='Avatar    Avatar--l')['src']
            return img.replace('_l', '_r')
        else:
            assert (self.card is not None)
            return (PROTOCOL + self.card.img['src'].replace('_xs', '_r'))
    else:
        return 'http://pic1.zhimg.com/da8e974dc_r.jpg'
