What Does "yield from" Do in Python? 

Crates generators. I've only ever used this in two scenarios: machine learning where you step through data (I think its a memory preservation thing) and in a Web scraper. Scrapy uses generators to crawl a page and whether to stop or continue based on whether there is a next page or not.

@@Septumsempra8818 you should start making videos too. nice explanation,thanks

That's quite interesting, I'd love to use them one day in ML

@Rafael-bd4ei sklearn's train test splitter. I think it is for time-series problems. As you loop through it you get a new time window

It's for chaining generators together