字典如下{"firstname":"dave","lastname":"mckenney","position":"instructor"}列表如下 mylist = [ [“firstname”, “dave”], [“l(fā)astname”, “mckenney”], [“position”, “instructor”] ]我現(xiàn)在想設(shè)計一個函數(shù)有這樣的功能：getvalue(mylist, “firstname”) → “dave”