python - 在 python 中产生特定的异常

Question

我想针对我遇到的错误生成一个异常。

获取 AWS session 时，用户必须输入 MFA 代码:

try:
    session = boto3.Session(profile_name=aws_account,region_name='us-east-1')
except ValidationError as validation_error:
    print(f"A validation error has occurred: {vallidation_error}")
except Exception as e:
    print(f"An exception has occurred: {e}")
    set_regions(aws_account)

异常看起来像这样:

An exception has occcurred: An error occurred (ValidationError) when calling the AssumeRole operation: 2 validation errors detected: Value '2121212dsa' at 'tokenCode' failed to satisfy constraint: Member must satisfy regular expression pattern: [\d]*; Value '2121212dsa' at 'tokenCode' failed to satisfy constraint: Member must have length less than or equal to 6

为什么我的行 except ValidationError as valid_error: 不起作用？如何生成此错误特有的异常？

Answer 1

检查以下几点:

1. 您已经安装了botocore库
2. 使用 from botocore.exceptions import ValidationError 导入将要使用的异常

代码看起来像:

import boto3
from botocore.exceptions import ValidationError

...

try:
    session = boto3.Session(profile_name=aws_account,region_name='us-east-1')
except ValidationError as validation_error:
    print(f"A validation error has occurred: {vallidation_error}")
except Exception as e:
    print(f"An exception has occurred: {e}")
    set_regions(aws_account)

PS:看来您还没有导入脚本中的异常。