AWS Boto3 Assume Role example

assume_role.py

import boto3
from boto3.session import Session


def assume_role(arn, session_name):
    """aws sts assume-role --role-arn arn:aws:iam::00000000000000:role/example-role --role-session-name example-role"""

    client = boto3.client('sts')
    account_id = client.get_caller_identity()["Account"]
    print(account_id)
    
    response = client.assume_role(RoleArn=arn, RoleSessionName=session_name)
     
    session = Session(aws_access_key_id=response['Credentials']['AccessKeyId'],
                      aws_secret_access_key=response['Credentials']['SecretAccessKey'],
                      aws_session_token=response['Credentials']['SessionToken'])
    
    client = session.client('sts')
    account_id = client.get_caller_identity()["Account"]
    print(account_id)