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这里的or前后顺序写反了
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Add a description, image, and links to the online-service topic page so that developers can more easily learn about it.
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https://github.com/PaddlePaddle/Serving/blob/0849586d38e56574d56b03aacb405a42d969568a/python/paddle_serving_app/reader/image_reader.py#L304
应该先判断是否为None,然后再判断它的属性