How to use the ethtool.get_coalesce function in ethtool

def set_coalesce(interface, args):
        try:
                coal = ethtool.get_coalesce(interface)
        except IOError:
                printtab("Interrupt coalescing NOT supported on %s!" % interface)
                return

        changed = False
        args = [a.lower() for a in args]
        for arg, value in [ ( args[i], args[i + 1] ) for i in range(0, len(args), 2) ]:
                real_arg = get_coalesce_dict_entry(arg)
                if not real_arg:
                        continue
                if value == "on":
                        value = 1
                elif value == "off":
                        value = 0
                else:
                        try:

def show_coalesce(interface, args = None):
        printtab("Coalesce parameters for %s:" % interface)
        try:
                coal = ethtool.get_coalesce(interface)
        except IOError:
                printtab("  NOT supported!")
                return

        printtab("Adaptive RX: %s  TX: %s" % (coal["use_adaptive_rx_coalesce"] and "on" or "off",
                                              coal["use_adaptive_tx_coalesce"] and "on" or "off"))

        printed = [ "use_adaptive_rx_coalesce",
                    "use_adaptive_tx_coalesce" ]
        for tunable in ethtool_coalesce_msgs:
                if tunable[0] == '\n':
                        print
                else:
                        printtab("%s: %s" % (tunable[0], coal[tunable[1]]))
                        printed.append(tunable[1])