def METHOD_NAME(opts):
    """
    Sysfs reports multiple ip addresses in arp_ip_target separated by space,
    which are represented by multiple elements in opts[ARP_IP_TARGET].
    The bonding driver accepts multiple ip addresses in the arp_ip_target
    option separated by a comma.
    To enable an unified handling for all options, the value of arp_ip_target
    is converted in the expression, which would accepted as value for setting
    this option. This is the separation of multiple ip addresses by comma.
    """
    if ARP_IP_TARGET in opts and len(opts[ARP_IP_TARGET]) > 1:
        opts[ARP_IP_TARGET] = [','.join(opts[ARP_IP_TARGET])]