【gRPC报错】 Assignment not allowed to message, map, or repeated field “rect“ in protocol message object_attributeerror: assignment not allowed to message,-优快云博客

本文介绍了一种常见的gRPC消息传递错误：尝试给消息、映射或重复字段赋值，并提供了解决方案。通过直接设置字段属性而非创建单独的对象再赋值，可以避免此类错误。

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 Assignment not allowed to message, map, or repeated field \"rect\" in protocol message object

报错原因
grpc中的字段rect 不允许被赋值
rect是DnBoundingRect 的对象

        result_pro = digitalNumber_pb2.DnResponse()
        for bbox_dict in bbox_list:
            bbox = digitalNumber_pb2.DnBoundingRect()
            bbox.x = bbox_dict['rect'][0]
            bbox.y = bbox_dict['rect'][1]
            bbox.w = bbox_dict['rect'][2]
            bbox.h = bbox_dict['rect'][3]
            result_dict = digitalNumber_pb2.DnResult()
            result_dict.classid = bbox_dict['classid']
            result_dict.score = bbox_dict['score']
            result_dict.rect = bbox
            result_pro.results.append(result_dict)

解决

        result_pro = digitalNumber_pb2.DnResponse()
        for bbox_dict in bbox_list:
            result_dict = digitalNumber_pb2.DnResult()
            result_dict.classid = bbox_dict['classid']
            result_dict.score = bbox_dict['score']
            result_dict.rect.x = bbox_dict['rect'][0]
            result_dict.rect.y = bbox_dict['rect'][1]
            result_dict.rect.w = bbox_dict['rect'][2]
            result_dict.rect.h = bbox_dict['rect'][3]
            result_pro.results.append(result_dict)