AttributeError: 'list' object has no attribute 'split'

I have this code where I try to assume a role and print Instance IDs:

import boto3
account_id = 'accountID'
role_name = 'MyRole'

def assume_role(role_name, account_id):
    session = boto3.Session()
    sts_client = session.client('sts')
    assumed_role_object = sts_client.assume_role(
        RoleArn=f'arn:aws:iam::{account_id}:role/{role_name}',
        RoleSessionName = f'{role_name}-Session'
    )

    assumed_role_credentials = assumed_role_object['Credentials']

    assumed_session = boto3.Session(
        aws_access_key_id=assumed_role_credentials['AccessKeyId'],
        aws_secret_access_key=assumed_role_credentials['SecretAccessKey'],
        aws_session_token=['SessionToken']
    )
    return assumed_session

ec2_role_session = assume_role(role_name, account_id)
instances = ec2_role_session.resource('ec2', region_name="us-east-1").instances.all()

for instance in instances:
    print(f"Instance ID: {instance.id}")

But after running using Python 3.7.10 I'm getting following error:

return ' '.join(value.split())
AttributeError: 'list' object has no attribute 'split'

I appreciate your guidance!

CodePudding user response：

It seems the problem is here

assumed_session = boto3.Session(
    aws_access_key_id=assumed_role_credentials['AccessKeyId'],
    aws_secret_access_key=assumed_role_credentials['SecretAccessKey'],
    aws_session_token=['SessionToken']
)

In the aws_session_token should go assumed_role_credentials['SessionToken'] as follows:

assumed_session = boto3.Session(
    aws_access_key_id=assumed_role_credentials['AccessKeyId'],
    aws_secret_access_key=assumed_role_credentials['SecretAccessKey'],
    aws_session_token=assumed_role_credentials['SessionToken']
)

Greetings