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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 get_macs(domain):
    '''
    Return a list off MAC addresses from the named VM

    CLI Example:

    .. code-block:: bash

        salt '*' virt.get_macs <domain>
    '''
    macs = []
    ret = __salt__['vmadm.lookup'](search="uuid={uuid}".format(uuid=domain), order='nics')
    if not ret:
        raise CommandExecutionError('We can\'t find the MAC address of this VM')
    else:
        for nic in ret[0]['nics']:
            macs.append(nic['mac'])
        return macs