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Groups > comp.lang.python > #45012
| References | <71427882-d2c6-4066-b1e2-624b12a42a0d@googlegroups.com> |
|---|---|
| Date | 2013-05-09 16:52 +1000 |
| Subject | Re: Append to python List |
| From | Chris Angelico <rosuav@gmail.com> |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.1484.1368082844.3114.python-list@python.org> (permalink) |
On Thu, May 9, 2013 at 4:36 PM, RAHUL RAJ <omrahulrajcse@gmail.com> wrote:
> output=[x for x in sample2 if x not in output]
>
> output=[]
> for x in sample2:
> if x not in output:
> output.append(x)
The first one constructs a list, then points the name 'output' at it.
The second one builds up a list, with 'output' pointing at it all the
way. Your first one is more like:
sample2 = [x+y for x in range(1,10) for y in range(1,10) if x!=y]
output=[]
_temp=[]
for x in sample2:
if x not in output:
_temp.append(x)
output=_temp
You may want to consider using a set, instead.
>>> {x+y for x in range(1,10) for y in range(1,10) if x!=y}
{3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17}
ChrisA
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Append to python List RAHUL RAJ <omrahulrajcse@gmail.com> - 2013-05-08 23:36 -0700
Re: Append to python List Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2013-05-09 09:55 +0300
Re: Append to python List 88888 Dihedral <dihedral88888@googlemail.com> - 2013-05-09 04:24 -0700
Re: Append to python List Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2013-05-09 14:30 +0300
Re: Append to python List 88888 Dihedral <dihedral88888@googlemail.com> - 2013-05-10 02:51 -0700
Re: Append to python List Chris Angelico <rosuav@gmail.com> - 2013-05-09 21:49 +1000
Re: Append to python List Anssi Saari <as@sci.fi> - 2013-05-11 18:47 +0300
Re: Append to python List Chris Angelico <rosuav@gmail.com> - 2013-05-12 02:00 +1000
Re: Append to python List 88888 Dihedral <dihedral88888@googlemail.com> - 2013-05-11 19:29 -0700
Re: Append to python List Chris Angelico <rosuav@gmail.com> - 2013-05-12 12:40 +1000
Re: Append to python List Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2013-05-12 09:02 +0300
Re: Append to python List Chris Angelico <rosuav@gmail.com> - 2013-05-09 16:52 +1000
Re: Append to python List Gary Herron <gary.herron@islandtraining.com> - 2013-05-08 23:54 -0700
Re: Append to python List RAHUL RAJ <omrahulrajcse@gmail.com> - 2013-05-09 01:18 -0700
Re: Append to python List RAHUL RAJ <omrahulrajcse@gmail.com> - 2013-05-09 01:19 -0700
Re: Append to python List Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-05-09 11:14 +0000
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