课堂三级菜单练习#三级菜单，按b返回某一级菜单，按q退出菜单

#Author:AXIN
#Date:2017/5/22 10:45
#三级菜单，按b返回某一级菜单，按q退出菜单
data = {
    '北京':{
        '昌平':{
            '沙河':[ 'Oldboy','test'],
            '天通苑':['链家地产','我爱我家'],
            },
        '朝阳':{
            '望京':['奔驰','陌陌'],
            '国贸':['CICC','HP'],
            '东直门':['Advent','飞信'],
        },
        '海淀':{
            '学院路':['北大','清华','北理','北航']
        }
    },
    '山东':{
        '德州':{
            '武城县':['gubeichun'],
            'dezhoushi':['paji']

                  },
        '济南':{
                '泉城路':['ditie','gaotie'],
                 '趵突泉':['138','126']
                 },
        '青岛':{
                '市北区':['Hisense','Hier'],
                 '市南区':['langCahao'],
                 '李沧区':['langxun']
                },
            }
        }
exit_flag = False
while not exit_flag:
    for i in data:
        print(i)

    choice = input('选择进入>>>1')
    if choice in data:

        while not exit_flag:
            for i2 in data[choice]:
                print('\t',i2)
            choice2 = input('选择进入>>>2')
            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')
                    if choice3 in data[choice][choice2]:
                        for i4 in data[choice][choice2][choice3]:
                            print('\t\t\t',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
    elif choice == 'q':
        exit_flag = True