Steve D'Aprano writes: > Every few years, the following syntax comes up for discussion, with > some people saying it isn't obvious what it would do, and others > disagreeing and saying that it is obvious. So I thought I'd do an > informal survey. > > What would you expect this syntax to return? > > [x + 1 for x in (0, 1, 2, 999, 3, 4) while x < 5]
[1, 2, 3] > For comparison, what would you expect this to return? (Without > actually trying it, thank you.) > > [x + 1 for x in (0, 1, 2, 999, 3, 4) if x < 5] [1, 2, 3, 4, 5] > How about these? > > [x + y for x in (0, 1, 2, 999, 3, 4) while x < 5 for y in (100, 200)] [100, 200, 101, 201, 102, 202] > > [x + y for x in (0, 1, 2, 999, 3, 4) if x < 5 for y in (100, 200)] [100, 200, 101, 201, 102, 202, 103, 203, 104, 204] -- https://mail.python.org/mailman/listinfo/python-list
