python第7章用戶輸入和While循環(huán)課后習(xí)題答案

Solutions-Chapter7Note:SublimeTextdoesntrunprogramsthatprompttheuserforinput.YoucanuseSublimeTexttowriteprogramsthatpromptforinput,butyoullneedtorunthesegramsfromaterminal.Seeinput,butyoullneedtorunthesegramsfromaterminal.Seeonpage16.onpage16.“RunningPythonProgramsfromaTerminal7-1:RentalCarWriteaprogramthataskstheuserwhatkindofrentalcartheywouldlike.Printamessageaboutthatcar,suchas “LetmeseeifIcanfindyouaSubaru.”car=input("Whatkindofcarwouldyoulike?" )print("LetmeseeifIcanfindyoua" +car.title()+".")Output:Whatkindofcarwouldyoulike? ToyotaTacomaLetmeseeifIcanfindyouaToyotaTacoma.7-2:RestaurantSeatingWriteaprogramthataskstheuserhowmanypeopleareintheirdinnergroup.Iftheanswerismorethaneight,printamessagesayingthey'llhavetowaitforatable.Otherwise,reportthattheirtableisready.party_size=input("Howmanypeopleareinyourdinnerpartytonight?")party_size=int(party_size)ifparty_size>8:print("I'msorry,you'llhavetowaitforatable." )else:print("Yourtableisready.")Output:Howmanypeopleareinyourdinnerpartytonight? 12I'msorry,you'llhavetowaitforatable.or:Howmanypeopleareinyourdinnerpartytonight? 6Yourtableisready.7-3:MultiplesofTenAsktheuserforanumber,andthenreportwhetherthenumberisamultipleof10ornot.TOC\o"1-5"\h\znumber=input("Givemeanumber,please:" )number=int(number)ifnumber%10==0:print(str(number)+"isamultipleof10." )else:print(str(number)+"isnotamultipleof10." )Output:Givemeanumber,please: 2323isnotamultipleof10.or:Givemeanumber,please: 9090isamultipleof10.7-4:PizzaToppingsWritealoopthatpromptstheusertoenteraseriesofpizzatoppingsuntiltheyenteraquitvalue.Astheyentereachtopping,printamessagesayingyou'mpt="\nWhattoppingwouldyoulikeonyourpizza?"prompt+="\nEnter'quit'whenyouarefinished:"whileTrue:topping=input(prompt)iftopping!='quit'print("I'lladd" +topping+"toyourpizza.")else:breakOutput:Whattoppingwouldyoulikeonyourpizza?Enter'quit'whenyouarefinished: pepperoniI'lladdpepperonitoyourpizza.Whattoppingwouldyoulikeonyourpizza?Enter'quit'whenyouarefinished: sausageI'lladdsausagetoyourpizza.Whattoppingwouldyoulikeonyourpizza?Enter'quit'whenyouarefinished: baconI'lladdbacontoyourpizza.Whattoppingwouldyoulikeonyourpizza?Enter'quit'whenyouarefinished: quit7-5:MovieTicketsAmovietheaterchargesdifferentticketpricesdependingonaperson'sage.Ifapersonisundertheageof3,theticketisfree;iftheyarebetween3and12,theticketis$10;andiftheyareoverage12,theticketis$15.Writealoopinwhichyouaskuserstheirage,andthentelthemthecostoftheirmovieticket.

prompt="Howoldareyou?"prompt+="\nEnter'quit'whenyouarefinished.whileTrue:age=input(prompt)ifage=='quit'breakage=int(age)ifage<3:print("Yougetinfree!")elifage<13:TOC\o"1-5"\h\zprint("Yourticketis$10." )else:print("Yourticketis$15." )Output:Howoldareyou?Enter'quit'whenyouarefinished. 2Yougetinfree!Howoldareyou?Enter'quit'whenyouarefinished. 3Yourticketis$10.Howoldareyou?Enter'quit'whenyouarefinished. 12Yourticketis$10.Howoldareyou?Enter'quit'whenyouarefinished. 18Yourticketis$15.Howoldareyou?Enter'quit'whenyouarefinished. quit7-8:DeliMakealistcalledsandwich_ordersandfillitwiththenamesofvarioussandwiches.Thenmakeanemptylistcalledfinished_sandwiches.Loopthroughthelistofsandwichordersandprintamessageforeachorder,suchasImadeyourtunasandwich.Aseachsandwichismade,

moveittothelistoffinishedsandwiches.Afterallthesandwicheshavebeenmade,printamessagelistingeachsandwichthatwasmade.sandwich_orders=['veggie','grilledcheese','turkey','roastbeef]finished_sandwiches=口whilesandwich_orders:current_sandwich=sandwich_orders.pop()print("I'mworkingonyour"+current_sandwich+"sandwich.")finished_sandwiches.append(current_sandwich)print("\n")forsandwichinfinished_sandwiches:print("Imadea" +sandwich+"sandwich.")Output:I'mworkingonyourroastbeefsandwich.I'mworkingonyourturkeysandwich.I'mworkingonyourgrilledcheesesandwich.I'mworkingonyourveggiesandwich.Imadearoastbeefsandwich.Imadeaturkeysandwich.Imadeagrilledcheesesandwich.Imadeaveggiesandwich.7-9:NoPastramiUsingthelistsandwich_ordersfromExercise7-8,makesurethesandwich'pastrami'appearsinthelistatleastthreetimes.Addcodenearthebeginningofyourprogramtoprintamessagesayingthedelihasrunoutofpastrami,andthenuseawhilelooptoremovealloccurencesof'pastrami'fromsandwich_orders.Makesurenopastramisandwichesendupinfinished_sandichessandwich_orders=['pastrami','veggie','grilledcheese','pastrami','turkey','roastbeef','pastrami']finished_sandwiches=口print("I'msorry,we'realloutofpastramitoday." )while'pastrami'insandwich_orders:sandwich_orders.remove('pastrami')print("\n")whilesandwich_orders:current_sandwich=sandwich_orders.pop()print("I'mworkingonyour"+current_sandwich+"sandwich.")finished_sandwiches.append(current_sandwich)print("\n")forsandwichinfinished_sandwiches:print("Imadea" +sandwich+"sandwich.")Output:I'msorry,we'realloutofpastramitoday.I'mworkingonyourroastbeefsandwich.I'mworkingonyourturkeysandwich.I'mworkingonyourgrilledcheesesandwich.I'mworkingonyourveggiesandwich.Imadearoastbeefsandwich.Imadeaturkeysandwich.Imadeagrilledcheesesandwich.Imadeaveggiesandwich.7-10:DreamVacationWriteaprogramthatpollsusersabouttheirdreamvacation.WriteapromptsimilartoIfyoucouldvisitoneplaceintheworld,wherewouldyougo?I_prompt="\nWhat'syourname?"place_prompt="Ifyoucouldvisitoneplaceintheworld,wherewoulditbe?"continue_prompt="\nWouldyouliketoletsomeoneelserespond?(yes/no)"#Responseswillbestoredintheform{name:place}.responses={}whileTrue:Asktheuserwherethey'=input(name_prompt)place=input(place_prompt)Storetheresponse.responses[name]=placeAskifthere'sanyoneelseresponding.repeat=input(continue_prompt)ifrepeat!='yes'breakSh