boto3 without param region_name may cause error:InvalidAccessKeyId

[funnyndk]

I tried to access a S3 using awsKeyTools with AK/SK, but got a error:
botocore.exceptions.ClientError: An error occurred (InvalidAccessKeyId) when calling the ListBuckets operation: The AWS Access Key Id you provided does not exist in our records.
it turns out that boto3 without param region_name cant work. i changed awsKeyTools/commands/user_info_command.py as below and fix the problem:
class UserInfoCommand(Command): def run(self, line): client = boto3.client('s3',region_name="cn-north-1")# 实际生产环境region_name一定要准确填写 buckets = client.list_buckets()['Buckets'] print("\nbucket:") for bucket in buckets: print(bucket['Name']) iam = boto3.resource('iam',region_name="cn-north-1") global current_user current_user = iam.CurrentUser() print("\nUserInfo:") print("\tuser_id:\t\t", current_user.user_id)...
but i was using a low-privileged AK/SK, that code only works before bucket listing. new error was occurred:
botocore.exceptions.ClientError: An error occurred (AccessDenied) when calling the GetUser operation: User: xxxxxxxxxxxxxxxxxxxxxxxxxx is not authorized to perform: iam:GetUser on resource: user dmsfiles because no identity-based policy allows the iam:GetUser action
it is better that the tool can catch some normal error from botocore and show some help.