How the pytube's callbacks: on_download_progress and on_download_complete, are used. I am getting an error while using them

from pytube import YouTubedef download(link):youtube_Ob = YouTube(link,on_download_progress)youtube_Ob = youtube_Ob.streams.get_highest_resolution()try:youtube_Ob.download()except:print("An error occured!")print("YO! Download Successful")link = input("Enter the link here: ")download(link)

There is no documentation regarding the the callback on_download_progress

I tried many ways like:

youtube_Ob.register_on_progress_callback(on_progress)

but did not work rather it broke the whole script.