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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def _expand_balancer(lb):
    '''
    Convert the libcloud load-balancer object into something more serializable.
    '''
    ret = {}
    ret.update(lb.__dict__)
    hc = ret['extra']['healthchecks']
    ret['extra']['healthchecks'] = []
    for item in hc:
        ret['extra']['healthchecks'].append(_expand_item(item))

    fwr = ret['extra']['forwarding_rule']
    tp = ret['extra']['forwarding_rule'].targetpool
    reg = ret['extra']['forwarding_rule'].region
    ret['extra']['forwarding_rule'] = {}
    ret['extra']['forwarding_rule'].update(fwr.__dict__)
    ret['extra']['forwarding_rule']['targetpool'] = tp.name
    ret['extra']['forwarding_rule']['region'] = reg.name

    tp = ret['extra']['targetpool']
    hc = ret['extra']['targetpool'].healthchecks
    nodes = ret['extra']['targetpool'].nodes
    region = ret['extra']['targetpool'].region
    zones = ret['extra']['targetpool'].region.zones

    ret['extra']['targetpool'] = {}
    ret['extra']['targetpool'].update(tp.__dict__)
    ret['extra']['targetpool']['region'] = _expand_item(region)
    ret['extra']['targetpool']['nodes'] = []
    for n in nodes:
        ret['extra']['targetpool']['nodes'].append(_expand_node(n))
    ret['extra']['targetpool']['healthchecks'] = []
    for hci in hc:
        ret['extra']['targetpool']['healthchecks'].append(hci.name)
    ret['extra']['targetpool']['region']['zones'] = []
    for z in zones:
        ret['extra']['targetpool']['region']['zones'].append(z.name)
    return ret