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Groups > comp.lang.python > #106223
| From | Marko Rauhamaa <marko@pacujo.net> |
|---|---|
| Newsgroups | comp.lang.python |
| Subject | Re: Strange range |
| Date | 2016-04-01 17:12 +0300 |
| Organization | A noiseless patient Spider |
| Message-ID | <87twjlju3i.fsf@elektro.pacujo.net> (permalink) |
| References | <87y48xjwqq.fsf@elektro.pacujo.net> <56fe76f2$0$22141$c3e8da3$5496439d@news.astraweb.com> |
Steven D'Aprano <steve@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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Strange range Marko Rauhamaa <marko@pacujo.net> - 2016-04-01 16:15 +0300
Re: Strange range Chris Angelico <rosuav@gmail.com> - 2016-04-02 00:24 +1100
Re: Strange range Steven D'Aprano <steve@pearwood.info> - 2016-04-02 00:26 +1100
Re: Strange range Marko Rauhamaa <marko@pacujo.net> - 2016-04-01 17:12 +0300
Re: Strange range Random832 <random832@fastmail.com> - 2016-04-01 10:39 -0400
Re: Strange range Fabien <fabien.maussion@gmail.com> - 2016-04-01 16:16 +0200
Re: Strange range Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-04-01 17:28 +0300
Re: Strange range Chris Angelico <rosuav@gmail.com> - 2016-04-02 01:31 +1100
Re: Strange range Marko Rauhamaa <marko@pacujo.net> - 2016-04-01 17:34 +0300
Re: Strange range Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-04-01 17:44 +0300
Re: Strange range Chris Angelico <rosuav@gmail.com> - 2016-04-02 01:45 +1100
Re: Strange range Marko Rauhamaa <marko@pacujo.net> - 2016-04-01 18:43 +0300
Re: Strange range Erik <python@lucidity.plus.com> - 2016-04-01 20:58 +0100
Re: Strange range Marko Rauhamaa <marko@pacujo.net> - 2016-04-01 23:14 +0300
Re: Strange range Rob Gaddi <rgaddi@highlandtechnology.invalid> - 2016-04-01 20:21 +0000
Re: Strange range Marko Rauhamaa <marko@pacujo.net> - 2016-04-01 23:44 +0300
Re: Strange range Steven D'Aprano <steve@pearwood.info> - 2016-04-02 21:09 +1100
Re: Strange range Marko Rauhamaa <marko@pacujo.net> - 2016-04-02 13:48 +0300
Re: Strange range Ned Batchelder <ned@nedbatchelder.com> - 2016-04-02 12:47 -0700
Re: Strange range Marko Rauhamaa <marko@pacujo.net> - 2016-04-02 23:44 +0300
Re: Strange range Chris Angelico <rosuav@gmail.com> - 2016-04-03 07:05 +1000
Re: Strange range Marko Rauhamaa <marko@pacujo.net> - 2016-04-03 00:40 +0300
Re: Strange range Ned Batchelder <ned@nedbatchelder.com> - 2016-04-02 14:50 -0700
Re: Strange range Stephen Hansen <me+python@ixokai.io> - 2016-04-02 23:43 -0700
Re: Strange range Marko Rauhamaa <marko@pacujo.net> - 2016-04-03 09:58 +0300
Re: Strange range Chris Angelico <rosuav@gmail.com> - 2016-04-03 17:10 +1000
Re: Strange range Ethan Furman <ethan@stoneleaf.us> - 2016-04-03 09:28 -0700
Re: Strange range Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-04-04 13:21 +0100
Re: Strange range Chris Angelico <rosuav@gmail.com> - 2016-04-03 17:08 +1000
Re: Strange range Steven D'Aprano <steve@pearwood.info> - 2016-04-03 14:43 +1000
Re: Strange range Random832 <random832@fastmail.com> - 2016-04-03 01:20 -0400
Re: Strange range Steven D'Aprano <steve@pearwood.info> - 2016-04-03 15:28 +1000
Re: Strange range Marko Rauhamaa <marko@pacujo.net> - 2016-04-01 17:32 +0300
Re: Strange range Random832 <random832@fastmail.com> - 2016-04-01 10:42 -0400
Re: Strange range Chris Angelico <rosuav@gmail.com> - 2016-04-02 01:50 +1100
Re: Strange range Ian Kelly <ian.g.kelly@gmail.com> - 2016-04-01 08:52 -0600
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