我刚开始使用 Google 自然语言处理库…尝试从本地文本文件中提取实体，但一直遇到错误。我甚至尝试了 Google 提供的示例代码，但错误依然存在。
这是我的代码:
import sixfrom google.cloud import languagefrom google.cloud.language import enumsfrom google.cloud.language import typesdef entities_text(text): """Detects entities in the text.""" client = language.LanguageServiceClient(credentials='cred.json') if isinstance(text, six.binary_type): text = text.decode('utf-8') # Instantiates a plain text document. document = types.Document( content=text, type=enums.Document.Type.PLAIN_TEXT) # Detects entities in the document. You can also analyze HTML with: # document.type == enums.Document.Type.HTML entities = client.analyze_entities(document).entities # entity types from enums.Entity.Type entity_type = ('UNKNOWN', 'PERSON', 'LOCATION', 'ORGANIZATION', 'EVENT', 'WORK_OF_ART', 'CONSUMER_GOOD', 'OTHER') for entity in entities: print('=' * 20) print(u'{:<16}: {}'.format('name', entity.name)) print(u'{:<16}: {}'.format('type', entity_type[entity.type])) print(u'{:<16}: {}'.format('metadata', entity.metadata)) print(u'{:<16}: {}'.format('salience', entity.salience)) print(u'{:<16}: {}'.format('wikipedia_url', entity.metadata.get('wikipedia_url', '-')))if __name__ == "__main__": with open('test.txt', 'r') as text: text = text.read() ent = entities_text(text) print(ent)这是错误堆栈跟踪:
AuthMetadataPluginCallback " <google.auth.transport.grpc.AuthMetadataPlugin object at 0x7f6973b4a668>" raised exception!Traceback (most recent call last):File "/home/user/Documents/CODE/venv/lib/python3.6/site- packages/grpc/_plugin_wrapping.py", line 79, in __call__ callback_state, callback))File "/home/user/Documents/CODE/venv/lib/python3.6/site- packages/google/auth/transport/grpc.py", line 77, in __call__ callback(self._get_authorization_headers(context), None)File "/home/user/Documents/CODE/venv/lib/python3.6/site- packages/google/auth/transport/grpc.py", line 61, in _get_authorization_headers self._credentials.before_request(AttributeError: 'str' object has no attribute 'before_request'请问如何才能返回实体信息呢？
回答：
credentials 参数不接受字符串，而是需要一个 Credentials 对象。从您的 JSON 文件中创建一个这样的对象并传入即可。
from google.oauth2 import service_accountcredentials = service_account.Credentials.from_service_account_file('cred.json')这里的提示是这一行: self._credentials.before_request。您传入 credentials，LanguageServiceClient 对象将其存储在私有变量 _credentials 中，并尝试调用其上的方法。由于您的字符串没有这个方法，所以会出错。
