python之路-基础篇3

作业：

1、每周写一篇博客

2、编写登录接口

输入用户名密码

认证成功后显示欢迎信息

输错三次后锁定

3、多级菜单

三级菜单

可依次选择进入各子菜单

所需新知识点：列表、字典

data = {        "水果":{                  "香蕉":{                        "产地":["海南","马尔代夫"],                        "价格":[9.9,29.9]                },                "苹果":{                        "产地":["美国","山东"],                        "价格":[1.2,5.5]                },                "荔枝":{                        "产地":["台湾","云南","广西"],                        "价格":[9,35,18]                },        },        "蔬菜":{                "菜花":{                        "产地":["河北","河南"],                        "价格":[25,13]                },                "西红柿":{                        "产地":["怀柔","延庆"],                        "价格":[0.5,1]                },        },        "调料":{                "酱油":{                        "品牌":["海天","鲁花","李锦记"],                        "价格":[25.5,35.5,15.5]                },                "食用盐":{                        "品牌":["久大","白象"],                        "价格":[5,9]                },        },}while True:        for i in data:                print(i)        choice = input("选择进入1>>:")        if choice in data:                while True:                        for i2 in data[choice]:                                print("\t",i2)                        choice2 = input("输入b返回上一级菜单或选择进入2>>:")                        if choice2 in data[choice]:                                while True:                                        for i3 in data[choice][choice2]:                                                print("\t\t",i3)                                        choice3 = input("输入b返回上一级菜单或选择进入3>>:")                                        if choice3 in data[choice][choice2]:                                                for i4 in data[choice][choice2][choice3]:                                                        print("\t\t",i4)                                                choice4 = input("输入b返回上一层，或输入q退出>>:")                                                if choice4 == "b":                                                        pass                                                elif choice4 == "q":                                                        exit()                                                                                                  if choice3 == "b":                                                break                                        elif choice3 == "q":                                                exit()                        if choice2 == "b":                                break                        elif choice2 == "q":                                exit()        else:                print("输入内容不存在。")                break