<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:

def show_lb(kwargs=None, call=None):
    '''
    Show the details of an existing load-balancer.

    CLI Example:

    .. code-block:: bash

        salt-cloud -f show_lb gce name=lb
    '''
    if call != 'function':
        raise SaltCloudSystemExit(
            'The show_lb function must be called with -f or --function.'
        )
    if not kwargs or 'name' not in kwargs:
        log.error(
            'Must specify name of load-balancer.'
        )
        return False

    lb_conn = get_lb_conn(get_conn())
    return _expand_balancer(lb_conn.get_balancer(kwargs['name']))