在Python中将文件更改为只读模式 [英] Change file to read-only mode in Python

问题描述

我正在写一个数据处理代码，在其中创建一个新文件，把处理过的数据写入这个文件并关闭。但是文件必须以只读模式关闭，以免意外修改。这可以在Python中完成吗？

解决方案

为此，您可以使用 os.chmod

  import stat 
 from stat import S_IREAD，S_IRGRP，S_IROTH 
 
 filename =path / to / file
 os。 chmod（filename，S_IREAD | S_IRGRP | S_IROTH）
  

请注意，假设您拥有适当的权限，您不仅需要所有者能够读取文件。如果不是这样，请删除 S_IROTH 和 S_IRGRP 。

如果您需要使文件再次可写，只需调用 os.chmod c $ c>如此：

  from stat import S_IWUSR＃需要将这个导入添加到
 $上面b $ b os.chmod（文件名，S_IWUSR | S_IREAD）＃这使文件读/写为所有者
  

在打开文件进行写入之前，只需调用它，然后调用第一个表单，在完成后再次将其设置为只读。

I am writing a data processing code, in which I create a new file, write processed data in to this file and close. But the file has to be closed in read-only mode, so that it would not be accidentally modified. Can this be done in Python?

解决方案

For this you use os.chmod

import os
from stat import S_IREAD, S_IRGRP, S_IROTH

filename = "path/to/file"
os.chmod(filename, S_IREAD|S_IRGRP|S_IROTH)

Note that this assumes you have appropriate permissions, and that you want more than just the owner to be able to read the file. Remove S_IROTH and S_IRGRP as appropriate if that's not the case.

UPDATE

If you need to make the file writable again, simply call os.chmod as so:

from stat import S_IWUSR # Need to add this import to the ones above

os.chmod(filename, S_IWUSR|S_IREAD) # This makes the file read/write for the owner

Simply call this before you open the file for writing, then call the first form to make it read-only again after you're done.

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