《python编程：从入门到实践》第三版第三章练习答案

练习3.1：姓名：将一些朋友的姓名存储在一个列表中，并将其命名为names。依次访问该列表中的每个元素，从而将每个朋友的姓名都打印出来。

names = ['Gina', 'Alan', 'Frank', 'Eric']
print(names[0])
print(names[1])
print(names[2])
print(names[3])

输出：

Gina
Alan 
Frank
Eric 

练习3.2：问候语：继续使用练习3-1中的列表，但不打印每个朋友的姓名，而为每人打印一条消息。每条消息都包含相同的问候语，但抬头为相应朋友的姓名。

names = ['gina', 'alan', 'frank', 'eric']
print(f"Hello, {names[0].title()}!")
print(f"Hello, {names[1].title()}!")
print(f"Hello, {names[2].title()}!")
print(f"Hello, {names[3].title()}!")

输出：

Hello, Gina!
Hello, Alan!
Hello, Frank!
Hello, Eric!

练习3.3：自己的列表：想想你喜欢的通勤方式，如骑摩托车或开汽车，并创建一个包含多种通勤方式的列表。根据该列表打印一系列有关这些通勤方式的陈述，如下所示。

                I would like to own a Honda motorcycle.

commuting = ['car', 'train', 'plane', 'bike']
print(f"I would like to own a {commuting[0]}.")
print(f"I would like to own a {commuting[1]}.")
print(f"I would like to own a {commuting[2]}.")
print(f"I would like to own a {commuting[3]}.")

输出：

I would like to own a car.
I would like to own a train.
I would like to own a plane.
I would like to own a bike.

练习3.4：嘉宾名单：如果你可以邀请任何人一起共进晚餐，你会邀请哪些人？请创建一个列表，其中包含至少3个你想邀请的人；然后，使用这个列表打印消息，邀请这些人来与你共进晚餐。

names = ['Li Bai', 'Du Fu', 'Du Mu']
print(f"{names[0]}, I want to invite you to have dinner with me.")
print(f"{names[1]}, I want to invite you to have dinner with me.")
print(f"{names[2]}, I want to invite you to have dinner with me.")

输出：

Li Bai, I want to invite you to have dinner with me.
Du Fu, I want to invite you to have dinner with me.
Du Mu, I want to invite you to have dinner with me.

练习3.5：修改嘉宾名单：你刚得知有位嘉宾无法赴约，因此需要另外邀请以为嘉宾。

        ■以完成练习3-4时编写的程序为基础，在程序末尾添加一条print语句，指出哪位嘉宾无法赴约。

        ■修改嘉宾名单，将无法赴约的嘉宾的姓名替换为新邀请的嘉宾的姓名。