字典实例－－三级菜单

#!/usr/bin/env python3
#auth by lusen at 2016-11-23
# --*-- encoding utf-8 --*--

data = {
	'北京':{
		'昌平':{
			'沙河':['oldboy','test'],
			'天通苑':['链家','我爱我家']
			 },
		'朝阳':{
			'望京':['奔驰','陌陌'],
			'国贸':{'CICC','HP'},
			'东直门':{'Advent','飞信'}
			 },
		'海淀':{

			 }
		},
	'山东':{
		'德州':{
			},
		'青岛':{
			},
		'济南':{
			}
		},
	'广东':{
		'东莞':{
			},
		'常熟':{
			},
		'佛山':{
			}
		}
}

exit_flag = False
while not exit_flag:
	for i in data:
		print(i)
	choice = input("选择进入1,按q退出>>:")

	if choice in data:
		while not exit_flag:
			for i2 in data[choice]:
				print("\t",i2)
			choice2 = input("选择进入2,按b返回,按q退出>>:")

			if choice2 in data[choice]:
				while not exit_flag:
					for i3 in data[choice][choice2]:
						print("\t\t",i3)
					choice3 = input("选择进入3,按b返回,按q退出>>:")
					if choice3 in data[choice][choice2]:
						for i4 in data[choice][choice2][choice3]:
							print("\t\t",i4)
						choice4 = input("最后一层，按b返回,按q退出>>:")
						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