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Groups > comp.lang.python > #105491
| Newsgroups | comp.lang.python |
|---|---|
| Date | 2016-03-22 07:23 -0700 |
| References | <1010f2cb-21f9-495b-8af4-03ad209b4c1e@googlegroups.com> <eb002b45-6b6b-422c-8a9b-ee36c95109ca@googlegroups.com> |
| Message-ID | <1ec91e1c-9d0e-448b-a7b6-194ac105f8e2@googlegroups.com> (permalink) |
| Subject | Re: Convert list to another form but providing same information |
| From | anantguptadbl@gmail.com |
On Tuesday, March 22, 2016 at 12:01:10 AM UTC+5:30, Maurice wrote: > Just figured why: > > If I type this on the kernel: > > weirdList = [[0]*3]*5 > > weirdList > Out[257]: [[0, 0, 0], [0, 0, 0], [0, 0, 0], [0, 0, 0], [0, 0, 0]] > > weirdList[0][0] = 1 > > weirdList > Out[259]: [[1, 0, 0], [1, 0, 0], [1, 0, 0], [1, 0, 0], [1, 0, 0]] > > All first elements of the sublists also changes. I dunno why... When we write [[0] * 3] * 5, the [0] * 3 list is repeated 5 times its something like list,list,list,list,list if we change the 1st element of list, it gets reflected on all the 5 copies
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Convert list to another form but providing same information Maurice <mauricioliveiraguarda@gmail.com> - 2016-03-21 11:26 -0700
Re: Convert list to another form but providing same information Maurice <mauricioliveiraguarda@gmail.com> - 2016-03-21 11:30 -0700
Re: Convert list to another form but providing same information Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-21 19:24 +0000
Re: Convert list to another form but providing same information anantguptadbl@gmail.com - 2016-03-22 07:23 -0700
Re: Convert list to another form but providing same information Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-21 19:21 +0000
Re: Convert list to another form but providing same information Peter Otten <__peter__@web.de> - 2016-03-21 20:22 +0100
Re: Convert list to another form but providing same information Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-03-21 20:03 +0000
Re: Convert list to another form but providing same information Ian Kelly <ian.g.kelly@gmail.com> - 2016-03-21 14:12 -0600
Re: Convert list to another form but providing same information Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-03-22 00:31 +0000
Re: Convert list to another form but providing same information Chris Angelico <rosuav@gmail.com> - 2016-03-22 11:58 +1100
Re: Convert list to another form but providing same information Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2016-03-22 15:34 +1100
Re: Convert list to another form but providing same information Ian Kelly <ian.g.kelly@gmail.com> - 2016-03-21 14:14 -0600
Re: Convert list to another form but providing same information Steven D'Aprano <steve@pearwood.info> - 2016-03-22 11:13 +1100
Re: Convert list to another form but providing same information Paul Rubin <no.email@nospam.invalid> - 2016-03-21 18:35 -0700
Re: Convert list to another form but providing same information Steven D'Aprano <steve@pearwood.info> - 2016-03-22 21:49 +1100
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