How to Rename Multiple Files with Different Extensions in Python

Learn how to efficiently rename multiple files with different extensions in Python while skipping existing files. Follow our step-by-step guide to avoid common errors.
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How to Rename Multiple Files with Different Extensions in Python

Renaming files programmatically can save time and reduce human error, especially in projects involving many files. However, you may encounter issues, such as trying to rename a file to a name that already exists, causing errors in your code.

In this guide, we'll explore how to effectively rename multiple files with different extensions (like .png and .xml) in Python while managing existing files to ensure your process runs smoothly without interruption.

Problem Overview

If you're working on a project where multiple files with varying extensions need renaming, running into errors due to filename conflicts can be frustrating. Specifically, you might receive an error indicating that a file you are trying to create already exists.

Error Example

Error Message: "File already exists"

This issue usually arises from an attempt to rename files with names that already exist in the target directory.

Solution: Step-by-Step Guide

To tackle this problem, we can create a script that renames files while checking for existing names and automatically skipping any that are already present. Below, we will break down the solution:

1. Backup Your Data

Before starting our process, it's crucial to create a backup of your files. This ensures that in case anything goes wrong, your original files stay safe.

2. Set Up Your Environment

Start by importing the necessary module:

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3. Define Your Directories

Define the path of your input and output directories. For example:

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4. Create Output Directory

Create the output directory where renamed files will be stored. If it already exists, no error will be thrown:

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5. Gather Files

Using Path.glob(), create lists of files ending with .png and .xml extensions:

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6. Rename and Write Files

Next, we'll loop through each list and rename the files sequentially:

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7. Clean Up Old Directory

Once files have been renamed, the original files in directory are deleted:

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Result

After executing this script, the original folder structure will look as desired, with all .png and .xml files renamed in sequence:

Before Running the Script:

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After Running the Script:

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Important Note

Do Not Rename: This script does not rename existing files; rather, it creates new filenames based on a defined format.

Re-run Considerations: If you re-run the script after adding more images, ensure to delete the old output folder to avoid mix-ups!

Final Thoughts

Renaming multiple files in Python can seem daunting, but with the right approach and a robust script, you can automate this process smoothly. Always remember to back up your files before making bulk changes, and happy coding!