如何修改erlang中的记录？

我需要修改操作记录中的值 {place} 和 {other_place}。

#op{
    action   = [walk, from, {place}, to, {other_place}],
    preconds = [[at, {place}, me], [on, floor, me], 
                [other_place, {place}, {other_place}]],
    add_list = [[at, {other_place}, me]],
    del_list = [[at, {place}, me]]
}

但 erlang 不允许修改变量。有对应的数据类型吗？

erlang 不允许你修改变量，这是事实。但没有什么可以阻止您制作变量的修改副本。

鉴于您的记录：

Rec = #op{
    action   = [walk, from, {place}, to, {other_place}],
    preconds = [[at, {place}, me], [on, floor, me], 
                [other_place, {place}, {other_place}]],
    add_list = [[at, {other_place}, me]],
    del_list = [[at, {place}, me]]
}

您可以有效地获得修改后的版本，如下所示：

%% replaces the action field in Rec2 but everything else is the same as Rec.
Rec2 = Rec#op{action = [walk, from, {new_place}, to, {new_other_place}]}

这将完成你似乎要求的事情。