使用python插入方法的挑战

我正在尝试一些python列表练习问题。我试图在索引“-1”处插入一个新名称mike，但在将输出打印到屏幕上时，我注意到它默认位于晚餐列表中的另一个位置（索引（-2））

dinner = ['yemi', 'bimpe', 'kola', 'kunle', 'bola', 'shola', 'ola']

invite = f"{dinner[0].title()}, would you be available to attend our dinner party?"
print(invite)

invite = f"{dinner[-1].title()}, would you be available to attend our dinner party?"
print(invite)

invite = f"{dinner[-3].title()}, would you be available to attend our dinner party?"
print(invite)

invite = f"{dinner[3].title()}, would you be available to attend our dinner party?"
print(invite)

invite = f"{dinner[1].title()}, would you be available to attend our dinner party?"
print(invite)

not_coming = f"{dinner[0].title()} said she can't make the dinner party tonight and has to be swapped with {dinner[1].title()}"
print(not_coming)

not_coming = f"{dinner[-1].title()} said she can't make the dinner party tonight and has to be swapped with {dinner[-2].title()}"
print(not_coming)

dinner.insert(0, "kingsley")
print(dinner)

dinner.insert(-1, "mike")
print(dinner)

为什么会这样

名单上的名字是“晚餐” 国家文件

在给定位置插入项目。第一个参数是要插入的元素的索引

因此，如果使用索引

-1

，它将在最后一个之前插入

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若要插入最后一个，请使用以下任一选项

dinner.insert(len(dinner), "mike")
dinner.append("mike")

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非常感谢。我现在明白了。@yappiesam你可以考虑接受这个答案；）