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Build an M3U Playlist from Folder MP3s in Python

Scans a folder for MP3 files and writes a valid M3U playlist with absolute file URIs.

from pathlib import Path
import sys


def build_playlist(folder: str, output: str = "playlist.m3u") -> str:
    folder_path = Path(folder)
    if not folder_path.is_dir():
        raise FileNotFoundError(f"Folder not found: {folder}")

    mp3_files = sorted(folder_path.glob("*.mp3"))
    if not mp3_files:
        pri…

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