#7-1 #汽车租赁:编写一个程序,询问用户要租赁什么样的汽车,并打印一条消息, #如“Let me see if I can find you a Subaru”。 car = input("What the kind of car do you want to rent?") print("Let me see if I can find you a " + car) #7-2 #餐馆订位:编写一个程序,询问用户有多少人用餐。如果超过8 人,就打印一条消息,指出没有空桌;否则指出有空桌。 number = input("How many people?") number = int(number) if number > 8: print("Sorry, the desks are not available.") else: print("The desks are available.") #7-3 #10 的整数倍:让用户输入一个数字,并指出这个数字是否是10 的整数倍。 number = input("Give me a number and I can tell you if it is an integer multiple of 10. ") number = int(number) if number % 10 == 0: print("It is an integer multiple of 10.") else: print("It isn't an integer multiple of 10.") #7-4 比萨配料 prompt = "\nWhat kind of toppings do you want?" # prompt是变量,存的是提示信息,如果提示信息太长,可以写成2行。 prompt += "\nEnter 'quit' to end the program." # prompt += 的意思是在上行提示信息后,添加等号后的提示信息 active = True while active: message = input(prompt) if message == 'quit': break else: print("We will add: " + message + '.') #7-5 电影票:有家电影院根据观众的年龄收取不同的票价: # 不到3岁的观众免费;3~12岁的观众为10美元;超过12岁的观众为15美元. 请编写一个循环,在其中询问用户的年龄,并指出其票价. while True: #while True 打头的循环将不断运行,直到遇到break语句。 prompt = "\n Please enter your age, and then we will tell you how much you shall pay." prompt += "\n Enter 'quit' to end the program." age = input(prompt) if age == 'quit': break if int(age) < 3: print("Your cost is $0.") elif int(age) <= 12: print("Your cost is $10.") else: print("Your cost is $15.") #7-6 三个出口:以另一种方式完成练习 7-4 或练习 7-5,在程序中采取如下所有做法。(这道题很好,其实就是讲了三种停止循环的办法) #在 while 循环中使用条件测试来结束循环。(不太理解这种方法) #使用变量 active 来控制循环结束的时机。 # 使用 break 语句在用户输入'quit'时退出循环。 #1 prompt = "\nWhat kind of toppings do you want?" prompt += "\nEnter 'quit' to end the program." message = "" while message != 'quit': #循环输入值不是quit的情况,执行下面的代码块 message = input(prompt) #显示上面的提示信息,让用户输入值 if message != 'quit': #如果输入的值不是quit,就显示下面的代码块的消息 print("We will add: " + message + '.') #2 prompt = "\nWhat kind of toppings do you want?" prompt += "\nEnter 'quit' to end the program." active = True while active: message = input(prompt) if message == 'quit': active = False else: print("We will add: " + message + ".") #3 prompt = "\nWhat kind of toppings do you want?" # prompt是变量,存的是提示信息,如果提示信息太长,可以写成2行。 prompt += "\nEnter 'quit' to end the program." # prompt += 的意思是在上行提示信息后,添加等号后的提示信息 while True: message = input(prompt) if message == 'quit': break else: print("We will add: " + message + '.') #7-7 无限循环 :编写一个没完没了的循环,并运行它(要结束该循环,可按Ctrl +C,也可关闭显示输出的窗口)。 #哈哈,这题我一不小心就写对了。 #7-8 熟食店:创建一个名为sandwich_orders的列表,在其中包含各种三明治的名字;再创建一个名为finished_sandwiches的空列表. #遍历列表sandwich_orders,对于其中的每种三明治,都打印一条消息,如I made your tuna sandwich, # 并将其移到列表finished_sandwiches. 所有三明治都制作好后,打印一条消息,将这些三明治列出来. sandwich_orders = ['tuna sandwich', 'bacon sandwich', 'egg sandwich'] finished_sandwiches = [] for sandwich_order in sandwich_orders: print("I made your " + sandwich_order + ".") while sandwich_orders: making_sandwich = sandwich_orders.pop() finished_sandwiches.append(making_sandwich) print("I have made following sandwiches: ") for finished_sandwich in finished_sandwiches: print(finished_sandwich) #7-9 五香烟熏牛肉(pastrami)卖完了:使用为完成练习 7-8 而创建的列表sandwich_orders,并确保'pastrami'在其中至少出现了三次。 # 在程序开头附近添加这样的代码:打印一条消息,指出熟食店的五香烟熏牛肉卖完了; # 再使用一个 while 循环将列表 sandwich_orders 中的'pastrami'都删除。 # 确认最终的列表 finished_sandwiches 中不包含'pastrami'。 sandwich_orders = ['pastrami', 'tuna sandwich', 'pastrami', 'bacon sandwich', 'egg sandwich','pastrami'] print("Pastrami is out of the deli.") while "pastrami" in sandwich_orders: sandwich_orders.remove("pastrami") print("Only following sandwiches are available: ") for sandwich_order in sandwich_orders: print(sandwich_order.title()) #7-10 梦想的度假胜地:编写一个程序,调查用户梦想的度假胜地。 # 使用类似于“If you could visit one place in the world, where would you go?”的提示,并编写一个打印调查结果的代码块。 responses = {} poll = True while poll: name = input("What's you name?") place = input("If you could visit one place in the world, where would you go?") responses[name] = place repeat = input("Would you like to let another person respond? (yes/no)") if repeat == "no": poll = False print("---Polling Result---") for name, place in responses.items(): print("\nIf " + name.title() + " could visit one place in the world, he/she would go " + place.title() + ".")
Python编程:从入门到实践 (第七章习题)
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