【Python小练习】05-三级菜单

作业题目（一）：三级菜单

# 作业需求：

# 数据结构：

menu = {

'北京': {

'海淀': {

'五道口': {

'soho': {},

'网易': {},

'google': {}

},

'中关村': {

'爱奇艺': {},

'汽车之家': {},

'youku': {},

},

'上地': {

'百度': {},

},

},

'昌平': {

'沙河': {

'老男孩': {},

'北航': {},

},

'天通苑': {},

'回龙观': {},

},

'朝阳': {},

'东城': {},

},

'上海': {

'闵行': {

"人民广场": {

'炸鸡店': {}

}

},

'闸北': {

'火车战': {

'携程': {}

}

},

'浦东': {},

},

'山东': {},

}

# 需求：

1.可依次选择进入各子菜单

2.可从任意一层往回退到上一层

3.可从任意一层退出程序

（方法一）（明天更新方法二）

current_level =1

temp_keys =list(menu.keys())

level_one_condition =""

level_two_condition =""

level_three_condition =""

level_four_codition =""

while True:

has_error =False

ifcurrent_level ==5:

print("没有下一级菜单")

elifcurrent_level ==:

current_level =1

if(current_level ==1):

input_condition =input("请输入您想查询的省或者自治区: %s: "% temp_keys)

level_one_condition = input_condition

elif(current_level ==2):

input_condition =input("请输入您想查询的区: %s: "% temp_keys)

level_two_condition = input_condition

elif(current_level ==3):

input_condition =input("请输入您想查询的街道: %s: "% temp_keys)

level_three_condition = input_condition

elif(current_level ==4):

input_condition =input("请输入您想查询的公司: %s: "% temp_keys)

level_four_codition = input_condition

if(current_level ==1):

iflevel_one_conditioninlist(menu.keys()):

print("输入正确！")

else:

print("您好，不存在您所输入的省或自治区！")

has_error =True

elif(current_level ==2):

iflevel_two_conditioninlist(menu.get(level_one_condition).keys()):

print("输入正确！")

else:

print("您好，不存在您所输入的区或县！")

has_error =True

elif(current_level ==3):

iflevel_three_conditioninlist(menu.get(level_one_condition).get(level_two_condition).keys()):

print("输入正确！")

else:

print("您好，不存在您所输入的街道！")

has_error =True

elif(current_level ==4):

iflevel_four_coditioninlist(menu.get(level_one_condition).get(level_two_condition).get(level_three_condition).keys()):

print("输入正确！")

else:

print("您好，不存在您所输入的公司！")

has_error =True

select_condition =input("下一步操作: [继续/退回/退出]: ")

if(select_condition =="退出"):

break

elif(select_condition =="退回"):

current_level = current_level -1

if(current_level

current_level =1

if(current_level >5):

current_level =5

elif(select_condition =="继续"):

ifhas_error ==False andcurrent_level

current_level = current_level +1

if(current_level

current_level =1

if(current_level >5):

current_level =5

else:

print("选项不存在！默认继续")

ifhas_error ==False andcurrent_level

current_level = current_level +1

if(current_level ==1):

temp_keys =list(menu.keys())

if(current_level ==2):

temp_keys =list(menu.get(level_one_condition))

elif(current_level ==3):

temp_keys =list(menu.get(level_one_condition).get(level_two_condition))

elif(current_level ==4):

temp_keys =list(menu.get(level_one_condition).get(level_two_condition).get(level_three_condition))

elif(current_level ==5):

temp_keys =list(menu.get(level_one_condition).get(level_two_condition).get(level_three_condition).get(level_four_codition))