优化
# -*- coding: utf-8 -*- # @Author: oppend # @Date: 2017-07-29 23:56:31 # @Last Modified by: oppend # @Last Modified time: 2017-07-30 00:10:18 menu = {"北京":{"北京市":{"东城区":{4}, "西城区":{4}, "朝阳区":{4}, "丰台区":{4} } }, "天津":{"天津市":{"和平区":{4}, "河东区":{4}, "河西区":{4}, "南开区":{4}, "河北区":{4} }, "经开区":{"经开西区":{4}, "经开东区":{4} } } } current_layer = menu parrent_layer = [] while True: for layer in current_layer: print(layer) choice = input('current:') if choice in current_layer: parrent_layer.append(current_layer) current_layer = current_layer[choice] elif choice == 'b': if parrent_layer: current_layer = parrent_layer.pop() elif choice == 'q': break else: print('不存在')