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

Steven D'Aprano steve at pearwood.info
Tue Mar 25 06:28:29 CET 2014

On Tue, 25 Mar 2014 06:57:19 +1100, Chris Angelico wrote:

> Can you imagine a high level language without a simple notation for
> variable assignment? Certainly not.

I don't know... what a stack based or concatenative language like Forth, 
Postscript, Joy or Factor count as high-level?

I'm pretty sure Joy and Factor should. Perhaps not Forth or Postscript.

Some of these language may offer variable assignment, but using it is 
entirely optional. It's a convenience, nothing more.


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