Oops. I was simply mistaken on what the for-for syntax in list comprehensions did! Ideally, list comprehensions should support both parallel and nested for loops, but I'm not sure how to decide to parse them if they both occur. E.g. what is this? [(x,y+z) for x in (1,2,3,4,5,6); for y in "abc" for z in "de"] For me, the semicolon separates much stronger than the for, so (to me) this feels like (applying parentheses to show grouping): (for x); (for y for z) and would yield: [(1, "ad"), (2, "ae"), (3, "bd"), (4, "be"), (5, "cd"), (6, "ce")] But is that the most useful? And how do you write the other grouping? I mean: (for x; for y) (for z) which could yield: [(1, "ad"), (1, "ae"), (2, "bd"), (2, "be"), (3, "cd"), (3, "ce")] A more practical question: if we're going to introduce [::], list comprehensions, and parallel for loops, what would be the best way to introduce the patches so that each patch changes as little as possible of the code introduced by the previous patch? --Guido van Rossum (home page: http://dinsdale.python.org/~guido/)
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