用 Python 在文件中间插入一行? [英] Insert line at middle of file with Python?

问题描述

有没有办法做到这一点?假设我有一个文件，它是一个名称列表，如下所示:

Is there a way to do this? Say I have a file that's a list of names that goes like this:

1. 阿尔弗雷德
2. 账单
3. 唐纳德

如何在第 x 行(在本例中为第 3 行)插入第三个名字查理"，并自动将所有其他人发送到一行?我见过其他类似的问题，但他们没有得到有用的答案.是否可以完成，最好使用方法或循环?

How could I insert the third name, "Charlie", at line x (in this case 3), and automatically send all others down one line? I've seen other questions like this, but they didn't get helpful answers. Can it be done, preferably with either a method or a loop?

推荐答案

这是一种解决问题的方法.

This is a way of doing the trick.

with open("path_to_file", "r") as f:
    contents = f.readlines()

contents.insert(index, value)

with open("path_to_file", "w") as f:
    contents = "".join(contents)
    f.write(contents)

index 和 value 是您选择的行和值，行从 0 开始.

index and value are the line and value of your choice, lines starting from 0.

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