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Groups > comp.lang.python > #17286
| Date | 2011-12-15 17:54 +0000 |
|---|---|
| From | MRAB <python@mrabarnett.plus.com> |
| Subject | Re: test for list equality |
| References | <45d59336-7e75-4865-8573-56742b37097c@s26g2000yqd.googlegroups.com> |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.3678.1323971638.27778.python-list@python.org> (permalink) |
On 15/12/2011 16:36, noydb wrote:
> I want to test for equality between two lists. For example, if I have
> two lists that are equal in content but not in order, I want a return
> of 'equal' -- dont care if they are not in the same order. In order
> to get that equality, would I have to sort both lists regardless? if
> yes, how (having issues with list.sort)?
>
> Another way i tried, that I think is kind-of roundabout is like
> x = [2, 5, 1, 88, 9]
> y = [5, 2, 9, 1, 88]
> inBoth = list(set(x)& set(y))
>
> and then test that list.count is equal between inBoth and x and/or y.
>
>
> Any better suggestions?
>
> Thanks for any help!
You could count the number of times each item occurs using the Counter
class in the collections module:
>>> x = [2, 5, 1, 88, 9]
>>> y = [5, 2, 9, 1, 88]
>>> from collections import Counter
>>> cx = Counter(x)
>>> cy = Counter(y)
>>> cx
Counter({88: 1, 1: 1, 2: 1, 5: 1, 9: 1})
>>> cx == cy
True
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test for list equality noydb <jenn.duerr@gmail.com> - 2011-12-15 08:36 -0800
Re: test for list equality noydb <jenn.duerr@gmail.com> - 2011-12-15 09:49 -0800
Re: test for list equality John Gordon <gordon@panix.com> - 2011-12-15 17:57 +0000
Re: test for list equality Miki Tebeka <miki.tebeka@gmail.com> - 2011-12-15 09:59 -0800
Re: test for list equality MRAB <python@mrabarnett.plus.com> - 2011-12-15 18:12 +0000
Re: test for list equality darnold <darnold992000@yahoo.com> - 2011-12-15 10:12 -0800
Re: test for list equality Tim Chase <python.list@tim.thechases.com> - 2011-12-15 12:20 -0600
Re: test for list equality Miki Tebeka <miki.tebeka@gmail.com> - 2011-12-15 10:25 -0800
Re: test for list equality Miki Tebeka <miki.tebeka@gmail.com> - 2011-12-15 10:25 -0800
Re: test for list equality Terry Reedy <tjreedy@udel.edu> - 2011-12-15 20:02 -0500
Re: test for list equality Stefan Behnel <stefan_ml@behnel.de> - 2011-12-15 19:01 +0100
Re: test for list equality noydb <jenn.duerr@gmail.com> - 2011-12-15 10:07 -0800
Re: test for list equality Ian Kelly <ian.g.kelly@gmail.com> - 2011-12-15 11:28 -0700
Re: test for list equality noydb <jenn.duerr@gmail.com> - 2011-12-15 10:32 -0800
Re: test for list equality MRAB <python@mrabarnett.plus.com> - 2011-12-15 18:06 +0000
Re: test for list equality MRAB <python@mrabarnett.plus.com> - 2011-12-15 17:54 +0000
Re: test for list equality Alec Taylor <alec.taylor6@gmail.com> - 2011-12-16 17:30 +1100
Re: test for list equality Ian Kelly <ian.g.kelly@gmail.com> - 2011-12-16 00:11 -0700
Re: test for list equality Ian Kelly <ian.g.kelly@gmail.com> - 2011-12-16 00:32 -0700
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