YouTube is the world's most popular video hosting service, and you might come across a situation where you need a video download script. There is a utub3 for this purpose.

Utub3 is a lightweight, dependency-free Python library and command-line utility for downloading YouTube Videos.

Utub3 also simplifies piping by allowing you to set callback functions for various download events, such as progress or completion.

In addition, utub3 includes a command line utility that allows you to download videos directly from the terminal.

Quickstart

Installation

utub3 requires an installation of Python 3.6 or greater, as well as pip. (Pip is typically bundled with Python installations.)

To install from PyPI with pip:

$ python -m pip install utub3

Sometimes, the PyPI release becomes slightly outdated. To install from the source with pip:

$ python -m pip install git+https://github.com/pchchv/utub3

Using utub3 in a Python script

To download a video using the library in a script, you'll need to import the YouTube class from the library and pass an argument of the video URL. From there, you can access the streams and download them.

 >>> from utub3 import YouTube
 >>> YouTube('https://youtu.be/HxCcKzRAGWk').streams.first().download()
 >>> yt = YouTube('http://youtube.com/watch?v=HxCcKzRAGWk')
 >>> yt.streams
  ... .filter(progressive=True, file_extension='mp4')
  ... .order_by('resolution')
  ... .desc()
  ... .first()
  ... .download()

Using the command-line interface

Using the CLI is remarkably straightforward as well. To download a video at the highest progressive quality, you can use the following command:

$ utub3 https://youtube.com/watch?v=HxCcKzRAGWk

You can also do the same for a playlist:

$ utub3 https://www.youtube.com/watch?v=UP2XoGfhJ1Y&list=RDUP2XoGfhJ1Y&start_radio=1&t=3s