Python——三级菜单

#三级菜单函数
menu = {'北京'：｛海淀：｛'五道口'：｛｝'中关村'：｛｝'上帝'：｛｝｝'昌平'：｛｝'朝阳'：｛｝'东城'：｛｝｝，'上海'：｛｝'山东'：｛｝
｝    
def threeMe(dic):while True:for k in dic:print（k）key = input('imput>>').strip()if key == 'b' or key == 'q':returnelif key in dic.keys() and dic[key]:ret = threeMe(dic[key])if ret == 'q':returnelif (not dic.get(key) or (not dic[key]):continuethreeMe(menu)