> > > I think wasting of indentation levels for a single logical block should > be > > avoided if possible to make the code more legible, otherwise one hits the > > suggested line length limit too fast - suppose this is now inside a > method, > > you already lose at least 8 char ... > > Hence generators, which allow the nested loops to be readily factored > out into a named operation. > > def iter_interesting_triples(seq1, seq2, seq3): > for x in seq1: > if p1(x): > for y in seq2: > if p2(x, y): > for z in seq3: > if p3(x, y, z): > yield x, y, z > > for x, y, z in iter_interesting_triples(seq1, seq2, seq3): > f(x, y, z) >
This is an elegant solution, but I think it makes the code less clear if one has to loop up the definition of the generator. I any case, irrespective of limits or being dispensable, I think it would be more consistent for the language to allow the same syntax for "for" loops as is allowed in comprehensions.
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