def flush_legacy_mode_change(self, cli, before, after, before_users, after_users):
        out = str()
        args = []
        mod = 0

        for i in channel_property_items.keys():
            if before.get(i, False) and not after.get(i, False):
                if mod != 1:
                    if i == 'ban' or i == 'quiet' or i == 'invite-exemption' or i == 'exemption':
                        for j in before.get(i, []):
                            if j not in after.get(i):
                                out += channel_property_items[i]
                                args.append(j)
                        continue
                    out += channel_property_items[i]
                    if before.get(i, False) != True:
                        args.append(before.get(i))
                else:
                    mod = 1
                    out += '-'
                    if i == 'ban' or i == 'quiet' or i == 'invite-exemption' or i == 'exemption':
                        for j in before.get(i, []):
                            if j not in after.get(i):
                                out += channel_property_items[i]
                                args.append(j)
                        continue
                    out += channel_property_items[i]
                    if before.get(i, False) != True:
                        args.append(before.get(i))
            elif not before.get(i, False) and after.get(i, False):
                if mod == 2:
                    if i == 'ban' or i == 'quiet' or i == 'invite-exemption' or i == 'exemption':
                        for j in after.get(i):
                            if j not in before.get(i, []):
                                out += channel_property_items[i]
                                args.append(j)
                        continue
                    out += channel_property_items[i]
                    if after.get(i, False) != True:
                        args.append(after.get(i))
                else:
                    mod = 2
                    out += '+'
                    if i == 'ban' or i == 'quiet' or i == 'invite-exemption' or i == 'exemption':
                        for j in after.get(i):
                            if j not in before.get(i, []):
                                out += channel_property_items[i]
                                args.append(j)
                        continue
                    out += channel_property_items[i]
                    if after.get(i, False) != True:
                        args.append(after.get(i))
        if len(out) > 0:
            msg = RFC1459Message.from_data('MODE', source=cli, params=[self.name, out] + args)
            self.dump_message(msg)
dataset/ETHPy150Open mammon-ircd/mammon/mammon/channel.py/Channel.flush_legacy_mode_change/operator `==` -> `!=`