Guido: > > I probably missed it in this monster of a thread, but how do > > generator expressions do this? It seems that they'd only make > > reduce more efficient, but it would still be just as needed as > > before. > > All we need is more standard accumulator functions like sum(). There > are many useful accumulator functions that aren't easily expressed as > a binary operator but are easily done with an explicit iterator > argument, so I am hopeful that the need for reduce will disappear. But this would still be true even if we introduced such functions *without* generator expressions, i.e. given some new standard accumulator foo_accumulator which accumulates using foo_function, you can write r = foo_accumulator(some_seq) instead of r = reduce(foo_function, some_seq) regardless of whether some_seq is a regular list or a generator expression. So it seems to me that generator expressions have *no* effect on the need or otherwise for reduce, and any suggestion to that effect should be removed from the PEP as misleading and confusing. Greg Ewing, Computer Science Dept, +--------------------------------------+ University of Canterbury, | A citizen of NewZealandCorp, a | Christchurch, New Zealand | wholly-owned subsidiary of USA Inc. | greg at cosc.canterbury.ac.nz +--------------------------------------+
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