We seem to be, once again, rehashing about this.  For example, I proposed this in 2017, which was not the first time:

https://mail.python.org/archives/list/python-ideas@python.org/thread/GFZFJAI4WGFYFFVQTF7DORHMY7F45XZZ/

(Gary's suggestion, and (counter) counter points to it are in the linked discussion)

Would it maybe be time for someone to write a PEP for this (if they can be found), so it can then be rejected (or not)?

I think there is no bikeshedding to be done on the idea, though in terms of parsing there might be (though as I mentioned in that thread, there should be no difference to generator expression parsing).

On Fri, 1 May 2020 at 19:52, Gary Herron <gherron@digipen.edu> wrote:

On 5/1/20 9:19 AM, silverbacknet@gmail.com wrote:

I hope this isn't too noobish, nothing on the list comes up in Google, but I'm curious why the construct

for x in y if x.is_some_thing:
  # do a thing

But this is probably clearer (and has the same syntax):

for x in y:
  if x.is_some_thing:
    # do a thing

Cramming two separate thoughts onto a single line is probably *not* clearer.

isn't legal. That seems a very Pythonic symmetry with lambdas. The equivalent syntax required right now is,

for x in [x for x in y if x.is_some_thing]:
  # do a thing

Of course there's more flexibility in the full syntax, but is there any interest in the simpler, more performant one-line syntax?

Em

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-- 
Dr. Gary Herron
Professor of Computer Science
DigiPen Institute of Technology
(425) 895-4418

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