Boto3_assume_role.py

response = sts.assume_role(
        RoleArn=ORGS_ROLE,
        RoleSessionName="OrgsListRole"
    )
    session = boto3.Session(
        aws_access_key_id=response['Credentials']['AccessKeyId'],
        aws_secret_access_key=response['Credentials']['SecretAccessKey'],
        aws_session_token=response['Credentials']['SessionToken']
    )
    organizations = session.client('organizations', region_name="us-east-1")
    account_ids = list()
    # try:
    response = organizations.list_accounts()
    for account in response['Accounts']:
        account_ids.append(account['Id'])
    return account_ids