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Re: List Problem

References <5126348a-8e87-493d-975c-d6273e59784c@googlegroups.com> <b6555e91-54ba-42fb-bd99-561cb971c2ce@googlegroups.com> <505F8734.2020908@davea.name> <CAPTjJmr7F8yqjuD7GBOm1He95_YshEmW_HQ2cKMo4iPDMnCtfg@mail.gmail.com>
Date 2012-09-24 08:30 +1000
Subject Re: List Problem
From Chris Angelico <rosuav@gmail.com>
Newsgroups comp.lang.python
Message-ID <mailman.1161.1348439437.27098.python-list@python.org> (permalink)

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On Mon, Sep 24, 2012 at 8:27 AM, Chris Angelico <rosuav@gmail.com> wrote:
> a = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
> b = deepcopy(a) # b is a new list with three new sublists
>

Oops, this should be:

b = copy.deepcopy(a)

as in Steven's post. And in case I wasn't clear about it, the
deepcopy() function does deal with the issue I mention, but that's
part of why it's an expensive operation.

ChrisA

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Thread

List Problem jimbo1qaz <jimmyli1528@gmail.com> - 2012-09-23 14:31 -0700
  Re: List Problem jimbo1qaz <jimmyli1528@gmail.com> - 2012-09-23 14:44 -0700
    Re: List Problem Chris Angelico <rosuav@gmail.com> - 2012-09-24 07:57 +1000
    Re: List Problem Dave Angel <d@davea.name> - 2012-09-23 18:03 -0400
    Re: List Problem Chris Angelico <rosuav@gmail.com> - 2012-09-24 08:27 +1000
      Re: List Problem Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-09-23 22:37 +0000
        Re: List Problem Chris Angelico <rosuav@gmail.com> - 2012-09-24 08:45 +1000
    Re: List Problem Chris Angelico <rosuav@gmail.com> - 2012-09-24 08:30 +1000
    Re: List Problem "Littlefield, Tyler" <tyler@tysdomain.com> - 2012-09-23 18:56 -0600
    Re: List Problem Chris Angelico <rosuav@gmail.com> - 2012-09-24 11:52 +1000
  Re: List Problem Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-09-23 22:07 +0000
  Re: List Problem jimbo1qaz <jimmyli1528@gmail.com> - 2012-09-23 15:44 -0700

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