新手学python-Day2-变量和循环判断

第二天作业:

初探三级菜单,凭现有知识,注意变量可以不声明,但要提前赋值!

此处shuru = '' 可以不写,因为第7行被赋值了,如果只调用shuru不赋值就会报错

 shuru = ''
 sheng = ['山东', '河北']
 shi = ['济南', '秦皇岛']
 zhen = ['历下区', '秦皇区域']
 lie = {'a': sheng, 'b': shi, 'c': zhen}
 while True:
     shuru = input('请选择省?')
     if shuru == '':
         print(lie['a'])
     elif shuru == '':
         print(lie['b'])
     elif shuru == '':
         print(lie['c'])