Python循环三级菜单

选择城市》选择区》选择区内的公司等

三级菜单循环

# coding=utf-8
# Version:python3.6
# Name:shiwei
data = {
    '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': {},
            }
        },
        '朝阳': {},
        '东城': {},
    },
    '上海': {
        '宝山': {
            '大场': {},
            '上海大学': {},
        },
        '松江': {
            '佘山': {},
            '欢乐谷': {},
            '月亮湖': {},
        }
    },
    '杭州': {}
}
 
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  # 或者continue
                    elif choice3 == 'b':
                        break
                    elif choice3 == 'q':
                        exit_flag = True
                    else:
                        print('没有下级菜单了!按b 返回上级把！')
                        continue
 
            elif choice2 == 'b':
                break
            elif choice2 == 'q':
                exit_flag = True
            else:
                print('没有下级菜单了!按b 返回上级把！')
                continue
    elif choice == 'q':
         exit_flag = True
else:
    print('Byebye!')