三级菜单

#！ /usr/bin/env python
#Version: pyyhon 3.x
#Author : Syno

'''
    1st layer: chinese provinces
                Anhui
                    2nd layer:
                        Hefei
                            3rd layer:
                                Jingkai Area
                                Binghu Area...
                        Wuhu...

                Jiangsu...


'''


lab = {'china':
           {'Shanghai':
                {'浦东新区':
                     ['平安镇','大团镇'],
                 '嘉定区':['华新镇','安亭镇','黄渡镇'],
                 '闵行区':['北桥镇','新桥镇']},
            'Jiangsu':
                {'Najing':
                     ['windows']
               ,'Wuxi':
                     ['linux','else']}},
       'USA':
           {'Newyork':
                {'dongcheng':['doc文件']
                    ,'xicheng':['pdf文件','excel文件','其他']},
            'Califonia':
                {'Silicon':['1','2']
                    ,'Losangles':['3','4']}},
       '......':'......'}

'''
print(lab)
print(lab['china'])
print(lab['china']['Shanghai'])
print(lab['USA'])
print(lab['USA']['Newyork'])
'''


'''while True:
    name =input("china or USA?:")
    if 'china' ==name:
        print("You Got China!")
    elif 'USA' == name:
        print("You Got USA!")
    elif 'q' == name:
        print('Bye~')
        break
    else:
        print('Invalid input! please try again!')
        '''

tip = True
while tip:
    for i0 in lab:
        print('\t',i0)

    in_1st = input('where will you go 1st?>>>')
    if in_1st in lab:
        while tip:
            for i1 in lab[in_1st]:
                print('\t',i1)
            in_2nd = input('where will you go 2nd?>>>')
            if in_2nd in lab[in_1st]:
                while tip:
                    for i2 in lab[in_1st][in_2nd]:
                        print('\t\t',i2)
                    in_3rd = input('where will you go 3rd?>>>')
                    if in_3rd in lab[in_1st][in_2nd]:
                        while tip:
                            for i3 in lab[in_1st][in_2nd][in_3rd]:
                                print('\t\t\t',i3)
                            in_4th = input('layer above or quit?>>>')
                            if in_4th == 'b':
                                break
                            elif in_4th == 'q':
                                tip = False
                    if in_3rd == 'b':
                        break
                    elif in_3rd == 'q':
                        tip = False
            if in_2nd == 'b':
                break
            elif in_2nd == 'q':
                tip = False
    if in_1st == 'q':
        tip = False