d_city = {
"河南" : {"郑州" : ["二七区","中原区","回族管城区","惠济区","金水区","上街区"],
"信阳" : ["浉河区","平桥区","羊山新区","南湾区","上天梯区","鸡公山区"]},
"广东":{"广州":["越秀","海珠","荔湾","天河","白云","黄埔","南沙"],
"深圳":["罗湖区","龙岗区","福田区","南山区","盐田区","宝安区","大鹏新区"]}
原文：http://www.cnblogs.com/kamil/p/5143906.html