Lie Ryan wrote:
(which might be the more typical case). And I think range will be an
iterator in the future, imitating the behavior of xrange. So it doesn't
really matter anyway.
In 3.0, range is a class and range(arg) is a re-iterable instance of
that class.
>>> a = range(10,2,-3)
>>> a
range(10, 2, -3)
>>> list(a)
[10, 7, 4]
>>> list(a)
[10, 7, 4]
Re-iterablility is handy if you want to iterate twice over the same
range, especially is the range object is computed elsewhere.
Map and filter, on the other hand, produce one-use iterators. Filter
takes one iterable as input and map takes many iterables. Both make no
presumption that the inputs are re-iterable rather than a one-time
iterators.
Terry Jan Reedy
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