Generators as Stacks of Operations

See https://towardsdatascience.com/building-generator-pipelines-in-python-8931535792ff 

I'm delighted by this article. 

I was shown only the first, horrible, example. I think the idea was to push back on the idea of complex generators. I fumed.

Then I read the entire article.

Now I'm fuming at someone who posted the first example -- apparently having failed to read the rest of the post.

This idea of building a stack of iterators is very, very good.

The example (using simple operations) can be misleading. A follow-on example doing something like file parsing might be helpful. But, if you go too far, you wind up writing an entire book about Functional Programming in Python.