PythonCrashCourse 第七章习题

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 kind ofretal car you would like:")
print(f"Let me see if I can find you a {car}")

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

people =int(input("How many people are in your dinner group: "))
if people > 8:
    print("Your'll have to wait for a table")
else:
    print("Your table is ready.")

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("which number is your favorite number:  ")
number = int(number) % 10
if number == 0:
    print("The number is a multiple of 10")
else:
    print("The number is not a multiple of 10")

编写一个循环，提示用户输入一系列的比萨配料，并在用户输入'quit' 时结束循环。每当用户输入一种配料后，都打印一条消息，说我们会在比萨 中添加这种配料

prompt = "Please enter some toppings in your Pizza"
prompt += "\nenter 'quit' when you are done!\n"
message = ""
while message != 'quit':
    message = input(prompt)
    if message != 'quit':
        print(f"You'll add {message.title()} in your pizza\n")

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

flag = True
while flag:
    message = input("Plese tell me your age!\n")
    if message == 'none':
        flag = False
    else:
        age =int(message)
        if age <= 3:
            print("The ticket is free")
        elif age <= 12:
            print("The ticket is $10")
        else:
            print("The ticket is $15")

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

• 在while 循环中使用条件测试来结束循环。

• 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。

#a different versions of exercise_7.4.py
prompt = "Please enter some toppings in your Pizza"
prompt += "\nenter 'quit' when you are done!\n"
flag = True
while flag:
    message=input(prompt)
    if message == 'quit':
        flag = False
    else:
        print(f"You'll add {message.title()} in your pizza\n")
# a different versions of exercise_7.5.py
while True:
    message = input("Plese tell me your age!\n")
    if message == 'none':
        break
    else:
        age =int(message)
        if age <= 3:
            print("The ticket is free")
        elif age <= 12:
            print("The ticket is $10")
        else:
            print("The ticket is $15")

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)

while True:
    print("\n The loop never ends, please press CTRL-C or close the window displaying the output to end the loop.")

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_sandwichesm，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 =['chicken sandwich','ham sandwich','cheese sandwich','club sandwich','tuna sandwich']
finished_sandwichs =[]
while sandwich_orders:
    sandwich = sandwich_orders.pop()
    finished_sandwichs.append(sandwich)
    print(f"I made you {sandwich.title()}")
print(f"\n All the sandwich have been made,the length of sandwich is {len(finished_sandwichs)}")

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 =['chicken sandwich','pastrami','ham sandwich','pastrami','cheese sandwich',
                  'pastrami','club sandwich','tuna sandwich']
while 'pastrami'in sandwich_orders:
    sandwich_orders.remove('pastrami')
print(sandwich_orders)

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

prompt_name ="What is your name?\n"
prompt_vocation = "If you could visit one place in the world,where would you go?\n"
poll_active = True
vocations = {}
while poll_active:
    name = input(prompt_name)
    vocation = input(prompt_vocation)
    vocations[name] = vocation
    repeat  = input("\nWould you like to let another person respond?(yes/no)\n")
    if repeat == 'no':
        poll_active = False
print(f"\n --- Poll Results ---")
for name,vocation in vocations.items():
    print(f"{name} would like to go {vocation}.")