python - 如何捕捉 `botocore.errorfactory.UserNotFoundException` ？

Question

我正在使用 AWS Cognito制作 OAuth服务器。我现在正在创建异常处理程序，以防使用不存在，但 requests打算得到一个

ipdb> pk
'David'
ipdb> res = self.cognito_client.admin_get_user(
            UserPoolId=settings.AWS_USER_POOL_ID,
            Username=pk
        )
*** botocore.errorfactory.UserNotFoundException: An error occurred (UserNotFoundException) when calling the AdminGetUser operation: User does not exist.
Traceback (most recent call last):
  File "/Users/sarit/.pyenv/versions/futuready-titan/lib/python3.8/site-packages/botocore/client.py", line 316, in _api_call
    return self._make_api_call(operation_name, kwargs)
  File "/Users/sarit/.pyenv/versions/futuready-titan/lib/python3.8/site-packages/botocore/client.py", line 626, in _make_api_call
    raise error_class(parsed_response, operation_name)

boto3==1.12.15            # via -r el.in
botocore==1.15.15         # via boto3, s3transfer
django==3.0.3
python3.8.1

我查过 botocore source code UserNotFoundException
问题:
怎么才能具体 catch此 exception ?

Answer 1

有两种方法，如果异常暴露在客户端上，您可以直接捕获异常，或者从 botocore.exceptions 导入并使用它。
选项1:

try: 
    res = self.cognito_client.admin_get_user(
              UserPoolId=settings.AWS_USER_POOL_ID,
              Username=pk
          )
except self.cognito_client.exceptions.UserNotFoundException as e:
    print(e)

选项 2:

from botocore.exceptions import UserNotFoundException

try: 
    res = self.cognito_client.admin_get_user(
              UserPoolId=settings.AWS_USER_POOL_ID,
              Username=pk
          )
except UserNotFoundException as e:
    print(e)

参见 botos 错误处理 documentation了解更多详细信息。