python-三级菜单实例

#三级菜单实例

data = {

'beijing':{

"daoxianghu":{

"renhang":["mon","ey"],

"nonghang":["fnag","ban"]

},

"xierqi":{

"bai":["ditu","tieba"],

"lian":{"lenovo","thinkpad"},

"di":{"didi","didu"},

},

"daxing":{},

},

'xianggang':{

"jiulong":{},

"wangjiao":{},

"xinjie":{}

},

'guangdong':{

"dongg":{},

"zhuhai":{},

"foshan":{},

},

}

#定义一个exit_flag标志位

exit_flag = False

#当条件为真时，打印第一层菜单

while not exit_flag:

for i in data:

print(i)

choice = input("选择进入1>>:")

#判断在不在，如果在就打印第二层菜单

if choice in data:

while not exit_flag:

for i2 in data[choice]:

print("",i2)

choice2 = input("选择进入2>>:")

#判断在不在，如果在就打印第三层菜单

if choice2 in data[choice]:

while not exit_flag:

for i3 in data[choice][choice2]:

print("", i3)

choice3 = input("选择进入3>>:")

#进入第四层菜单，如果不存在就按b返回，按q退出

if choice3 in data[choice][choice2]:

for i4 in data[choice][choice2][choice3]:

print("",i4)

choice4 = input("最后一层，按b返回>>:")

if choice4 == "b":

pass

elif choice4 == "q":

exit_flag = True

if choice3 == "b":

break

elif choice3 == "q":

exit_flag = True

if choice2 == "b":

break

elif choice2 == "q":

exit_flag = True

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