Python入门与实践 Chapter 7 动手试一试

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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。
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’ 。
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。

实现上述题目的代码如下：

from prettytable import PrettyTable# 7-5
i = 4
while i > 0:i -= 1age = int(input("How old are you ?"))if age < 3:print("You are free my sweetheart!")elif 3 <= age <= 12:print("Handsome boy or beautiful girl, you need to pay $10 for ticket.")else:print("$15 for ticket, please.")# 7-9
foods = ['Cheddar Cheese Stuffed Burgers', 'pastrami', ' French Fries', "The Burger Lover's Burger",'pastrami', "Blueberry Buttermilk Pancakes", " Blueberry Crumble Pie", 'pastrami']
print("At first we have these foods." + '\n' + str(foods))
while 'pastrami' in foods:foods.remove('pastrami')
print("But what a pity that now pastrami has been sold out." + '\n' + str(foods))# 7-10
x = PrettyTable()
x.field_names=['Index', 'Place']
for i in range(5):place = input("So, if you could visit one place in the world, where would you go?")x.add_row([i, place])
print(x)