diff_lang

 local gang = require 'korea_lang'
 local week = require 'gangtai_lang'

 local diff_tbl = {}

 function get_tbl(cfgs)
     local tbl = {}
     for tag, info in pairs(cfgs.entries) do
         diff_tbl[tag] = {}

         for tid, lang in pairs(info) do
             lang.tag = tag
             tbl[tid] = lang
         end
     end
     return tbl
 end

 local gang_dic = get_tbl(gang)
 local week_dic = get_tbl(week)

 for tid, info in pairs(week_dic) do
     if not gang_dic[tid] or (gang_dic[tid].CN ~= week_dic[tid].CN) then
         local count = #diff_tbl[info.tag]
         diff_tbl[info.tag][ count+1 ] = string.format('%s\t%s', tid, info.CN)
     end
 end

 for tag, list in pairs(diff_tbl) do
     local file = io.open(tag .. '.txt', 'w')
     file:write(table.concat(list, '\n'))
     file:close()
 end