On Sun, Oct 23, 2016 at 12:57:10PM -0200, Danilo J. S. Bellini wrote:
The idea is to let generator expressions and list/set comprehensions have a clean syntax to access its last output. That would allow them to be an alternative syntax to the scan higher-order function [1] (today implemented in the itertools.accumulate function), which leads to an alternative way to write a fold/reduce. It would be nice to have something like:
[cut suggested syntax]
instead of a reduce:
[cut four existing ways to solve the problem] Why do we need a FIFTH way to solve this problem? What you are describing is *exactly* the use case for a reduce or fold function. Why add special magic syntax to make comprehensions do even more? Not everything needs to be a one liner. It's okay to import reduce to do a reduce. Its okay to write an actual for-loop.
Actually, I already wrote a solution for something similar to that: PyScanPrev [2].
Ah, that makes SIX existing solutions. Do we need a seventh? -- Steve