Explanation of this Python language feature? [x for x in x for x in x] (to flatten a nested list)

[Rustom Mody]

On Tuesday, April 8, 2014 7:03:31 AM UTC+5:30, Mark H. Harris wrote:
>     I have another question for y'all, is a function (particularly a 
> generator) a noun or a verb?  Does a function (or generator) 'do' 
> something (based on name and parms) or does it 'return' something based 
> on name and parms? Based on name and parms should a function (or 
> generator) function as a noun, or function as a verb, or *both*? --or, 
> are Classes nouns only, and all functions *are* verbs only?

If your question is "What is (function/generator...)?"
the answer is noun

If your question is "What does it (function/generator...) do/behave?"
the answer is verb