CODE EXAMPLE FOR PYTHON

pytube

#here is a indept video 
#https://www.youtube.com/watch?v=vEQ8CXFWLZU&list=WL&index=3

from pytube import YouTube
from sys import argv

link=input("Video: ")

    argv.append(link)
    
    #[0] is the code for argv
	#[1] is the video you just inputed on the 7th line of code
    link=argv[1]
	
    
    youtube=YouTube(link)
    #here is you can experiment and see how to get costum definition
    
    you_download=youtube.streams.get_highest_resolution()
    #inside download choose a folder were you want to save said video
    you_download.download()