A script to download audio file from YouTube link.

youtube.py

from pytube import YouTube

import validators

url = input("Enter a YouTube URL: ")

if not validators.url(url):
    raise ValueError("Please enter a correct URL.")

if not "youtube" in url:
    raise ValueError("Please enter a YouTube URL.")

print("Initializing...")

audio = YouTube(url)
tags = audio.streams.filter(only_audio=True)
audio_file = audio.streams.get_by_itag(tags[0].itag)

print("Download started...")

audio_file.download()

print(f"{audio.title} has been downloaded!")