Steven D'Aprano <st...@pearwood.info>:
> On Sat, 2 Apr 2016 12:15 am, Marko Rauhamaa wrote:
>> Note to self: range(10) is an iterator factory, not an iterator.
>
> Incorrect. range is a lazy sequence.
Incorrect. You and I agree.
> You can think of range as equivalent to something close to this:
>
> class Range(object):
> def __init__(self, start, end, step=1):
> self.start = start
> self.end = end
> self.step = step
>
> def __getitem__(self, index):
> value = self.start + (index-1)*self.step
> if value < self.end:
> return value
> raise IndexError
>
> def __iter__(self):
> try:
> index = 0
> while True:
> yield self[index]
> index += 1
> except IndexError:
> return
Yes, I realize it now. I had thought it was:
def range(start, end=None, step=1):
if end is None:
start, end = 0, start
i = start
while step * (end - i) > 0:
yield i
i += step
Marko
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