human
I wrote the below code

    if (not auth.s3_has_role(ADMIN)):
        auth.permission.fail()
    tablename = 'msg_twilio_channel'
    table = s3db[tablename]
    table.account_name.label = T('Account    Name')
    table.account_name.comment = DIV(_class='tooltip', _title=('%s|%s' % (T('Account    Name'), T('Identifier    Name    for    your    Twilio    Account.'))))
    table.url.label = T('URL')
    table.url.comment = DIV(_class='tooltip', _title=('%s|%s' % (T('URL'), T('URL    for    the    twilio    API.'))))
    table.account_sid.label = 'Account    SID'
    table.auth_token.label = T('AUTH    TOKEN')
    s3.crud_strings[tablename] = Storage(title_display=T('Twilio    Channel    Details'), title_list=T('Twilio    Channels'), label_create=T('Add    Twilio    Channel'), title_update=T('Edit    Twilio    Channel'), label_list_button=T('View    Twilio    Channels'), msg_record_created=T('Twilio    Channel    added'), msg_record_deleted=T('Twilio    Channel    deleted'), msg_record_modified=T('Twilio    Channel    updated'), msg_list_empty=T('No    Twilio    Channels    currently    defined'))
    def postp(r, output):
        if r.interactive:
            s3_action_buttons(r)
            table = r.table
            query = (table.deleted == False)
            rows = db(query).select(table.id, table.enabled)
            restrict_e = [str(row.id) for row in rows if (not row.enabled)]
            restrict_d = [str(row.id) for row in rows if row.enabled]
            from s3 import s3_str
            s3.actions += [dict(label=s3_str(T('Enable')), _class='action-btn', url=URL(args=['[id]', 'enable']), restrict=restrict_e), dict(label=s3_str(T('Disable')), _class='action-btn', url=URL(args=['[id]', 'disable']), restrict=restrict_d)]
            if (not s3task._is_alive()):
                s3.actions += [dict(label=s3_str(T('Poll')), _class='action-btn', url=URL(args=['[id]', 'poll']), restrict=restrict_d)]
        return output
    s3.postp = postp
    return s3_rest_controller()

What's a good function header?
assistant
#Here's a good function header.

def twilio_channel():