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Скачать или смотреть Understanding Why with_name() Does Not Rename Files in pathlib

  • vlogize
  • 2025-09-18
  • 4
Understanding Why with_name() Does Not Rename Files in pathlib
Pathlib with_name does not rename filepython 3.xpathlib
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Описание к видео Understanding Why with_name() Does Not Rename Files in pathlib

Discover how to effectively rename files using `pathlib` in Python, understanding the differences between `with_name()` and `replace()`.
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This video is based on the question https://stackoverflow.com/q/62315541/ asked by the user 'user2514157' ( https://stackoverflow.com/u/2514157/ ) and on the answer https://stackoverflow.com/a/62330307/ provided by the user 'user2514157' ( https://stackoverflow.com/u/2514157/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Pathlib with_name does not rename file

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The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
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Understanding Why with_name() Does Not Rename Files in pathlib

When working with the pathlib module in Python, you might encounter a situation where you use the with_name() method to rename a file, but it doesn't actually change the file's name on your filesystem. Let's unravel this issue and discover how to handle file renaming properly.

The Problem with with_name()

Imagine you start with a file called test.txt. You use pathlib to create this file and then you attempt to rename it as follows:

[[See Video to Reveal this Text or Code Snippet]]

You might expect the second print statement to show test_new.txt, but it still shows test.txt. Why?

Key Points to Understand

Immutability of Path Objects: The Path object is immutable, meaning its properties cannot be changed after creation. When you call with_name(), it doesn't modify the existing path p. Instead, it generates a new Path object with the desired name.

Creating a New Path: If you're using with_name() purely, the newly created path is lost if you don't assign it to a variable.

The Solution: Using replace()

To actually rename the file on the filesystem, you need to use the replace() method. This method will change the file name on the disk based on the new path generated by with_name(). Here’s how it works:

Step-by-Step Solution

Use with_name() to Create a New Path: Instead of assuming it changes p, you need to assign the result of with_name() to a new variable.

Rename the File with replace(): You can then call replace() to update the file on disk.

Here’s a corrected version of the code that accomplishes this:

[[See Video to Reveal this Text or Code Snippet]]

Summary of the Code Steps

Creating the Original File: Use the touch() method to ensure the file exists.

Using with_name(): Call with_name() and assign the result to a new variable to hold the new name.

Applying replace(): Use the replace() method with the new path to rename the file on the filesystem.

By following these steps, you can correctly rename files in Python using pathlib. Avoid assuming that methods like with_name() will modify existing path objects directly; always remember to assign new paths for effective file management.

Conclusion

Understanding the distinction between with_name() and replace() is essential for effective file operations in Python's pathlib. By adopting the proper steps, you can ensure your files are properly renamed and managed in your applications.

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