题目：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，指出其票价。 程序1为（使用 break 语句在用户输入 ‘quit’ 时退出循环）：
prompt = "\nPlease enter the your age:" prompt += "\n(Enter 'quit' when you are finished.) " while True : age = input(prompt) if age == 'quit': break else: age=int(age) if age<3: print("free") elif (age>=3 and age<=12): print("The ticket price is 10 dollars.") else: print("The ticket price is 15 dollars.")程序2为（使用变量 active 来控制循环结束的时机）：
prompt = "\nPlease enter the your age:" prompt += "\n(Enter 'quit' when you are finished.) " active=True while active : age = input(prompt) if age == 'quit': active=False else: age=int(age) if age<3: print("free") elif (age>=3 and age<=12): print("The ticket price is 10 dollars.") else: print("The ticket price is 15 dollars.")输入2时，结果为：
Please enter the your age: (Enter 'quit' when you are finished.) 2 free输入5时，结果为：
Please enter the your age: (Enter 'quit' when you are finished.) 5 The ticket price is 10 dollars.输入45时，结果为：
Please enter the your age: (Enter 'quit' when you are finished.) 45 The ticket price is 15 dollars.输入‘quit’时（终止程序），结果为：
Please enter the your age: (Enter 'quit' when you are finished.) quit Process finished with exit code 0