3-4 嘉宾名单

题目描述：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
与你共进晚餐。

代码展示：

guests = {'Reimu', 'Marisa', 'Alice'}
for guest in guests:
    print(guest + ", you are invited to dinner by Scarlet famliy tomorrow night.")

3-5 修改嘉宾名单

题目描述：你刚得知有位嘉宾无法赴约，因此需要另外邀请一位嘉宾。
·以完成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。
·再次打印一系列消息，向名单中的每位嘉宾发出邀请。

代码展示：

guests = {'Reimu', 'Marisa', 'Alice'}
for guest in guests:
    print(guest + ", you are invited to dinner by Scarlet famliy tomorrow night.")
# 失约信息
print(guests[0] + ' will be absent because another yihen happens')
guests[0] = 'suika'

print("The updated list:\n")
for guest in guests:
    print(guest + ", you are invited to dinner by Scarlet famliy tomorrow night.")

3-6 添加嘉宾

题目描述：你刚找到了一个更大的餐桌，可容纳更多的嘉宾。请想想你还想邀请哪三位嘉宾。
·以完成练习3-4或3-5时编写的程序为基础，在程序末尾添加一条print语句，指出你找到
 了一个更大的餐桌。
·使用insert()将一位新嘉宾添加到名单开头。
·使用insert()将另一位新嘉宾添加到名单中间。
·使用append()将最后一位新嘉宾添加到名单末尾。
·打印一系列消息，向名单中的每位嘉宾发出邀请。

代码展示：

guests = {'Reimu', 'Marisa', 'Alice'}
for guest in guests:
    print(guest + ", you are invited to dinner by Scarlet famliy tomorrow night.")

#指出找到了更大的餐桌
print("We found a larger-size table.")

#在开头、中间和末尾添加嘉宾
guests.insert(0,'Yukari')
guests.insert(2, 'Satori')
guests.append('Yuyuko')

print('The guests' list is updated.')

for guest in guests:
    print(guest + ", you are invited to dinner by Scarlet famliy tomorrow night.")

3-9 晚餐嘉宾

题目描述：在完成3-4~3-7时编写的程序之一中，使用len()打印一条消息，指出你邀请了多少位嘉宾
来与你共进晚餐。

代码展示：

guests = {'Reimu', 'Marisa', 'Alice'}
for guest in guests:
    print(guest + ", you are invited to dinner by Scarlet famliy tomorrow night.")#指明嘉宾人数
print("There are " + str(len(guests)) + " guests are going to have dinner in Koumakan")

3-11 有意引发错误

题目描述：在你的一个程序中，修改其中的索引，以引发索引错误。

代码展示：

guests = {'Reimu', 'Marisa', 'Alice'}
for guest in guests:
    print(guest + ", you are invited to dinner by Scarlet famliy tomorrow night.")
# 失约信息
#越界索引10
print(guests[10] + ' will be absent because another yihen happens')
guests[0] = 'suika'

print("The updated list:\n")
for guest in guests:
    print(guest + ", you are invited to dinner by Scarlet famliy tomorrow night.")