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Groups > comp.lang.python > #14979
| From | Alan Meyer <ameyer2@yahoo.com> |
|---|---|
| Newsgroups | comp.lang.python |
| Subject | Re: How to isolate a constant? |
| Date | 2011-10-25 15:50 -0400 |
| Organization | A noiseless patient Spider |
| Message-ID | <4EA71323.2030500@yahoo.com> (permalink) |
| References | <f5539538-d079-4be1-b2c0-d98d3fc6a33f@h39g2000prh.googlegroups.com> <mailman.2138.1319330815.27778.python-list@python.org> |
On 10/22/2011 8:46 PM, MRAB wrote:
> On 23/10/2011 01:26, Gnarlodious wrote:
>> Say this:
>>
>> class tester():
>> _someList = [0, 1]
>> def __call__(self):
>> someList = self._someList
>> someList += "X"
>> return someList
>>
>> test = tester()
>>
>> But guess what, every call adds to the variable that I am trying to
>> copy each time:
>> test()
>>> [0, 1, 'X']
>> test()
>>> [0, 1, 'X', 'X']
...
> Python will copy something only when you tell it to copy. A simple way
> of copying a list is to slice it:
>
> someList = self._someList[:]
And another simple way:
...
someList = list(self._someList)
...
Alan
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How to isolate a constant? Gnarlodious <gnarlodious@gmail.com> - 2011-10-22 17:26 -0700
Re: How to isolate a constant? Chris Rebert <clp2@rebertia.com> - 2011-10-22 17:41 -0700
Re: How to isolate a constant? Gnarlodious <gnarlodious@gmail.com> - 2011-10-22 18:01 -0700
Re: How to isolate a constant? 88888 Dihedral <dihedral88888@googlemail.com> - 2011-10-22 22:12 -0700
Re: How to isolate a constant? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-10-23 05:32 +0000
Re: How to isolate a constant? Paul Rudin <paul.nospam@rudin.co.uk> - 2011-10-23 11:23 +0100
Re: How to isolate a constant? MRAB <python@mrabarnett.plus.com> - 2011-10-23 01:46 +0100
Re: How to isolate a constant? Alan Meyer <ameyer2@yahoo.com> - 2011-10-25 15:50 -0400
Re: How to isolate a constant? Ian Kelly <ian.g.kelly@gmail.com> - 2011-10-25 14:05 -0600
Re: How to isolate a constant? Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2011-10-25 17:08 -0700
Re: How to isolate a constant? Mel <mwilson@the-wire.com> - 2011-10-25 22:48 -0400
Re: How to isolate a constant? Ian Kelly <ian.g.kelly@gmail.com> - 2011-10-25 18:30 -0600
Re: How to isolate a constant? Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2011-10-22 17:55 -0700
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