Level 3 menu

Level-3 menu date = {'beijing': {'haidian ': {'wudaokao': {'sogo': {}, 'netease ':{}, 'Google ': {'female ': 'Miss', 'handsome guy ': 'Duck' }}, 'zhongguancun ': {'iqiyi' :{}, 'car home ':{}, 'youku': {},}, 'shangdi ': {'Baidu' :{},},}, 'changping ': {'shahe ': {'old boy of huide mall ': {}, 'beihang' :{},}, 'tiantongyuan ':{}, 'huilongguan' :{},}, 'chaoyang ': {'chaoyang dama' :{}}, 'dongcheng ':{},}, 'shanghai': {'minhang': {"People's Square": {'fried chicken shop ': {'eat fried chicken in People's Square ':{}}}, 'zhabei': {'train barri': {'ctrip ':{}}, 'pudong ': {},}, 'shandong ': {'koryo' :{}},} flag = truewhile flag: for key in date: Print (key) nun = input ('Enter the city ') If nun = 'q': Flag = false if nun =' B ': break if nun in date: While flag: for I in date [nun]: Print (I) nun1 = input ('Please input ') If nun1 =' B ': break if nun1 in date [nun]: while flag: For I1 in date [nun] [nun1]: Print (I1) nun2 = input ('Please input ') If nun2 =' B ': break if nun2 in date [nun] [nun1]: While flag: For I2 in date [nun] [nun1] [nun2]: Print (I2) nun3 = input ('Please input ') If nun3 =' B ': break if nun3 in date [nun] [nun1] [nun2]: While flag: for I3 in date [nun] [nun1] [nun2] [nun3]: Print (nun3) nun4 = input ('Last line, input B, directly terminate ') if nun4 = 'B': Break

Level 3 menu, optimized version *************************************** *************
Flag = truenun = dateli = [] While flag: for key in Nun: Print (key) in_put = input ('Please input ') If in_put in Nun: Li. append (nun) nun = nun [in_put] If in_put = 'q': Li. pop () Flag = false if in_put = 'B': Break

 

Level 3 menu