assumerole.py

import boto3

awsAccounts = {
    "Account N1": { "id": "123456789", "role": "iam-role", "region": "eu-west-3", "envs": ["env01", "env02", "env03"] },
}

stsClient = boto3.client('sts')

for awsAccount in awsAccounts:
    assumedRoleObject=stsClient.assume_role(
        RoleArn="arn:aws:iam::"+awsAccounts[awsAccount]["id"]+":role/"+awsAccounts[awsAccount]["role"],
        RoleSessionName="StatusPageSession"
    )

    credentials=assumedRoleObject['Credentials']

    ACCESS_KEY=credentials.get("AccessKeyId")
    SECRET_KEY=credentials.get("SecretAccessKey")
    SESSION_TOKEN=credentials.get("SessionToken")