Chris Angelico writes:
What Python needs is not a way to cram more onto one line. What Python needs is a way to express an abstract concept: "iterate over the interesting parts of this collection".
Python has one, and you've already mentioned it: for thing in (x for x in this_collection if is_interesting(x)): It's noticably verbose, but it's an exact translation of your statement of the abstract concept above. It has all the benefits of the proposed syntax except compactness[1]. I'd have to see a fair number of examples to decide whether I think saving len(" (x for x in)") == 13 characters allows enough additional filtered iterations to be comfortably expressed on one line to be worth new syntax. I suspect that the redundancy and grouping parenthesis aspects won't make much difference for anything more complicated than the above, but they might. Steve Footnotes: [1] By "compactness" I mean all of brevity, DRY, and absence of grouping parentheses. I don't know if that's a useful term to summarize all of those, but let me throw it out there.