在 Python 中的给定索引处插入一些字符串到给定的字符串中

问题描述：

我是 Python 新手，面临一个问题:如何在现有字符串中插入一些字段?

I am newbie in Python facing a problem: How to insert some fields in already existing string?

例如，假设我从包含以下内容的任何文件中读取了一行:

For example, suppose I have read one line from any file which contains:

line = "Name Age Group Class Profession"

现在我必须在 Class 字段之前的同一行中插入 3rd Field(Group) 3 次.这意味着输出行应该是:

Now I have to insert 3rd Field(Group) 3 times more in the same line before Class field. It means the output line should be:

output_line = "Name Age Group Group Group Group Class Profession"

我可以轻松检索第三个字段(使用 split 方法)，但请告诉我插入字符串的最简单方法?

I can retrieve 3rd field easily (using split method), but please let me know the easiest way of inserting into the string?

答

一个经常让 Python 新手感到厌烦但其他海报没有明确说明的重要点是 Python 中的字符串是不可变的——你不能永远就地修改它们.

An important point that often bites new Python programmers but the other posters haven't made explicit is that strings in Python are immutable -- you can't ever modify them in place.

在 Python 中处理字符串时，您需要重新训练自己，以便不要思考我如何修改这个字符串?"相反，您在想我如何创建一个新的字符串，其中包含我已经获得的部分?"

You need to retrain yourself when working with strings in Python so that instead of thinking, "How can I modify this string?" instead you're thinking "how can I create a new string that has some pieces from this one I've already gotten?"

在 Python 中的给定索引处插入一些字符串到给定的字符串中

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