report on guard duty enablement by account

def report(config, tags, accounts, master, debug, region):
    """report on guard duty enablement by account"""
    accounts_config, master_info, executor = guardian_init(
        config, debug, master, accounts, tags)

    session = get_session(
        master_info.get('role'), 'c7n-guardian',
        master_info.get('profile'),
        region)

    client = session.client('guardduty')
    detector_id = get_or_create_detector_id(client)

    members = {m['AccountId']: m for m in
               client.list_members(DetectorId=detector_id).get('Members')}

    accounts_report = []
    for a in accounts_config['accounts']:
        ar = dict(a)
        accounts_report.append(ar)
        ar.pop('tags', None)
        ar.pop('role')
        ar.pop('regions', None)
        if a['account_id'] not in members:
            ar['member'] = False
            ar['status'] = None
            ar['invited'] = None
            ar['updated'] = datetime.datetime.now().isoformat()
            continue
        m = members[a['account_id']]
        ar['status'] = m['RelationshipStatus']
        ar['member'] = True
        ar['joined'] = m['InvitedAt']
        ar['updated'] = m['UpdatedAt']

    accounts_report.sort(key=operator.itemgetter('updated'), reverse=True)
    print(tabulate(accounts_report, headers=('keys')))