>>>>> "GvR" == Guido van Rossum <guido@beopen.com> writes: GvR> I'm afraid the answer will be the same, if these are again GvR> numerical analysts -- these people live by nested DO loops. :-( If we end up calling this new feature list comprehensions, we might create the expectation that they behave like list comprehensions in other languages. Haskell is one language with comprehensions and they behave the way that the numerical analysts expect them to behave. Maybe we should chalk it up to numerical analysts and funtional programmers being weird, but they may be on to something. Here's a short excerpt from the Gentle Introduction to Haskell: http://www.haskell.org/tutorial/goodies.html (Sec. 2.4.1) >[ f x | x <- xs ] >This expression can intuitively be read as "the list of all f x such >that x is drawn from xs." The similarity to set notation is not a >coincidence. The phrase x <- xs is called a generator, of which more >than one is allowed, as in: > >[ (x,y) | x <- xs, y <- ys ] > >This list comprehension forms the cartesian product of the two lists >xs and ys. The elements are selected as if the generators were >"nested" from left to right (with the rightmost generator varying >fastest); thus, if xs is [1,2] and ys is [3,4], the result is >[(1,3),(1,4),(2,3),(2,4)]. Jeremy
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