使用python插入方法的挑战

如何解决使用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”处插入新名称的麦克，但在将输出打印到屏幕上时，我发现它默认为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？

列表名称为“晚餐”

解决方法

list.insert国的文档

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，如果您使用索引-1，它将在最后一个索引之前插入

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要插入最后一个，请使用以下任意一个

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