code: def get(self, remote_file, local_file):
          
          sftp = self.get_sftp()
          try:
              sftp.get(remote_file, local_file)
          except Exception as e:
              logger.error('下载文件失败')
              logger.error('remote: %s, local: %s' % (remote_file, local_file))
              logger.error(e)
docs: 下载文件
          :param remote_file:
          :param local_file:
          :return: