dic={"A":5,"C":4,"B":10,"D":20}print(sorted(dic.items(),key=lambdaa:a[1],reverse=True))
                            

字典本身是無序的，需要先轉(zhuǎn)成元組再排序如下：
a={"A":5,"C":4,"B":10,"D":20}
importoperator
#按值排序排序
b=sorted(a.items(),key=operator.itemgetter(1),reverse=True)
print(b)