in async_detect_document
operation.result(timeout=180) File "C:\Python27\lib\site-packages\google\api_core_exception google.api_core.exceptions.GoogleAPICallError: None Error writing final output to: gs://**
我正在用Python开发谷歌云视觉API。但是,我不明白为什么单个映像的注释结果包含list of annotations。说:>>> from google.cloud.vision.feature import Feature
>>> from google.cloud.vision.featureimport F