11 用户交互，显示省市县三级联动的选择

dict = {
    "河北": {
        "石家庄":{"晋州市","平山县","元氏"},
        "邯郸": {"永年","涉县","磁县"},
        },
    "河南": {
        "郑州": {"新郑","荥阳","新密"},
        "周口": {"项城","淮阳","太康"},
        }
    }
inp1 = input("用户输入省份:")
for i in dict[inp1]:
    print(i)

inp2 = input("用户输入城市:")
for j in dict[inp1][inp2]:
    print(j)