Extracting extension from filename in Python

Better Stack Team
Updated on February 3, 2023

You can use the os.path.splitext() function from the os.path module in Python to extract the file extension from a filename.

Here's an example:

import os
filename = "example.txt"
extension = os.path.splitext(filename)[1]

This will output: .txt

Alternatively, you can use string slicing to extract the file extension.

import os
filename = "example.txt"
extension = filename[filename.index(".")+1:]

This will also output: .txt

Got an article suggestion? Let us know
Explore more
Licensed under CC-BY-NC-SA

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Make your mark

Join the writer's program

Are you a developer and love writing and sharing your knowledge with the world? Join our guest writing program and get paid for writing amazing technical guides. We'll get them to the right readers that will appreciate them.

Write for us
Writer of the month
Marin Bezhanov
Marin is a software engineer and architect with a broad range of experience working...
Build on top of Better Stack

Write a script, app or project on top of Better Stack and share it with the world. Make a public repository and share it with us at our email.


or submit a pull request and help us build better products for everyone.

See the full list of amazing projects on github