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()

pytube

 from pytube import Playlist
 pl = Playlist("https://www.youtube.com/watch?v=Edpy1szoG80&list=PL153hDY-y1E00uQtCVCVC8xJ25TYX8yPU")
 for video in pl.videos:
     video.streams.first().download()

pytube

>>> from pytube import YouTube
>>> YouTube('https://youtu.be/9bZkp7q19f0').streams.first().download()
>>> yt = YouTube('http://youtube.com/watch?v=9bZkp7q19f0')
>>> yt.streams
... .filter(progressive=True, file_extension='mp4')
... .order_by('resolution')
... .desc()
... .first()
... .download()

pytube

 from pytube import Playlist
 ps = Playlist("https://www.youtube.com/watch?v=R6wQmWMDiB4&list=PLYmlEoSHldN4nV-Js4x7domjygiBkeatC")
 for video in ps.videos:
     video.streams.first().download()

pytube python

$ pip install pytube

pytube

>>> yt = YouTube('http://youtube.com/watch?v=2lAe1cqCOXo')

pytube

>>> from pytube import YouTube

pytube3

For pytube3

>>> from pytube import YouTube
>>> YouTube('http://youtube.com/watch?v=9bZkp7q19f0').streams[0].download()