what's the python for this C statement?

[Terry Reedy]

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