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问题：如何修改文本文件？
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问题：如何修改文本文件？

我正在使用Python，并且想在不删除或复制文件的情况下将字符串插入文本文件。我怎样才能做到这一点？

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I’m using Python, and would like to insert a string into a text file without deleting or copying the file. How can I do that?

回答 0

不幸的是，没有重写的方法就无法插入文件的中间。如先前的张贴者所指出的，您可以将文件追加到文件中或使用“搜索”覆盖文件的一部分，但是如果要在文件的开头或中间添加内容，则必须重写它。

这是操作系统，而不是Python。所有语言均相同。

我通常要做的是从文件中读取，进行修改并将其写到名为myfile.txt.tmp或类似名称的新文件中。这比将整个文件读入内存更好，因为文件可能太大了。临时文件完成后，我将其重命名为原始文件。

这是一种很好的安全方法，因为如果文件写入由于任何原因而崩溃或中止，您仍然可以拥有原始文件。

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Unfortunately there is no way to insert into the middle of a file without re-writing it. As previous posters have indicated, you can append to a file or overwrite part of it using seek but if you want to add stuff at the beginning or the middle, you’ll have to rewrite it.

This is an operating system thing, not a Python thing. It is the same in all languages.

What I usually do is read from the file, make the modifications and write it out to a new file called myfile.txt.tmp or something like that. This is better than reading the whole file into memory because the file may be too large for that. Once the temporary file is completed, I rename it the same as the original file.

This is a good, safe way to do it because if the file write crashes or aborts for any reason, you still have your untouched original file.

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