As it is known, MP3 contains the audio track itself and some metadata such as the title of the track, album, band's name and some other information. And recently I got a necessity to fix the order of the tracks related to an audio book. In this case, the order of tracks matters. But originally, the files were not be marked by track numbers, so the players keep arbitrary order of the played files. So I decided to write a Python script to resolve this issue and I found a tool called `eyeD3` that allows to read and modify the metadata of audiofiles. `eyeD3` installation: ``` pip install eyeD3 ``` In my particular case, the order of track must be the same as the alphabet order of the file names. So I wrote and ran this script: ```python import os import eyed3 path = '/path/to/files/' names = os.listdir(path) names.sort() for num, name in enumerate(names, 1): audiofile = eyed3.load(os.path.join(path, name)) audiofile.tag.track_num = num audiofile.tag.save() ``` It worked, the tracks now go in the order I need. More about `eyeD3` you can find on the official documentation.