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