@classmethod
def get_duobel_http(cls):
    """
        todo 多贝云 获取代理http,形如 http://user:password@host:port 字符串
        :return:
        """
    proxy = 'http://%(user)s:%(pass)s@%(host)s:%(port)s' % {'host': cls.
        __duobel_proxy['host'], 'port': cls.__duobel_proxy['port'], 'user':
        cls.__duobel_proxy['username'], 'pass': cls.__duobel_proxy['password']}
    return proxy
