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Re: Overriding a global

References (4 earlier) <4ee671f6$0$29979$c3e8da3$5496439d@news.astraweb.com> <mailman.3569.1323726243.27778.python-list@python.org> <87k4611l4y.fsf@benfinney.id.au> <CAN1F8qWYRSq0oUTzeDn-+SYXdHr7+akAQPSk-R+90Ax7E1FAZQ@mail.gmail.com> <CALwzidngv952LTEguRcP9Pj3_-tZTNpqvqkjcid5sje63N8hkg@mail.gmail.com>
Date 2011-12-13 08:34 +0000
Subject Re: Overriding a global
From Joshua Landau <joshua.landau.ws@gmail.com>
Newsgroups comp.lang.python
Message-ID <mailman.3580.1323765301.27778.python-list@python.org> (permalink)

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On 13/12/2011, Ian Kelly <ian.g.kelly@gmail.com> wrote:
> On Mon, Dec 12, 2011 at 4:48 PM, Joshua Landau
> <joshua.landau.ws@gmail.com> wrote:
>> Rebinding logger locally in a function is really no
>> different to a subclass rebinding a variable from its main class using
>> that
>> class' value. The only difference is that, in that case, you have an
>> alternate binding to the original value.
>
> No, there is another difference, the reason for rebinding the name.
> In a subclass, you would rebind a class attribute because that
> particular attribute, which you need to change, is used and expected
> by external code, either in the base class or in code that uses its
> API (or both).  Local variables in functions, on the other hand, are
> not externally visible, so there is no need to do this in order to
> conform to the expectations of external code.  All it does in that
> case is to sow potential confusion.
>
So you're saying you should never extend methods or attributes that
aren't meant to be used as part of of the API? Because I can claim
guilty on this point.

I'd make this longer, but I've got class now :(

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Overriding a global Roy Smith <roy@panix.com> - 2011-12-10 15:47 -0500
  Re: Overriding a global MRAB <python@mrabarnett.plus.com> - 2011-12-10 21:07 +0000
    Re: Overriding a global Roy Smith <roy@panix.com> - 2011-12-10 16:10 -0500
      Re: Overriding a global Jean-Michel Pichavant <jeanmichel@sequans.com> - 2011-12-12 12:13 +0100
        Re: Overriding a global Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-12-12 21:28 +0000
          Re: Overriding a global Dave Angel <d@davea.name> - 2011-12-12 16:43 -0500
            Re: Overriding a global Ben Finney <ben+python@benfinney.id.au> - 2011-12-13 09:27 +1100
              Re: Overriding a global Dave Angel <d@davea.name> - 2011-12-12 20:46 -0500
              Re: Overriding a global Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-12-13 01:48 +0000
              Re: Overriding a global Ian Kelly <ian.g.kelly@gmail.com> - 2011-12-12 22:50 -0700
              Re: Overriding a global Joshua Landau <joshua.landau.ws@gmail.com> - 2011-12-13 08:34 +0000
              Re: Overriding a global Ian Kelly <ian.g.kelly@gmail.com> - 2011-12-13 12:34 -0700
              Re: Overriding a global Ian Kelly <ian.g.kelly@gmail.com> - 2011-12-13 12:54 -0700
          Re: Overriding a global Jean-Michel Pichavant <jeanmichel@sequans.com> - 2011-12-13 10:54 +0100
            Re: Overriding a global Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-12-13 11:15 +0000
              Re: Overriding a global Jean-Michel Pichavant <jeanmichel@sequans.com> - 2011-12-13 14:30 +0100
              Re: Overriding a global Jean-Michel Pichavant <jeanmichel@sequans.com> - 2011-12-14 11:14 +0100
              Re: Overriding a global Chris Angelico <rosuav@gmail.com> - 2011-12-14 21:32 +1100
              Re: Overriding a global Jean-Michel Pichavant <jeanmichel@sequans.com> - 2011-12-14 13:05 +0100
                Re: Overriding a global Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-12-14 12:53 +0000
                Re: Overriding a global Jean-Michel Pichavant <jeanmichel@sequans.com> - 2011-12-14 14:35 +0100
              Re: Overriding a global Chris Angelico <rosuav@gmail.com> - 2011-12-14 23:21 +1100
              Re: Overriding a global Jean-Michel Pichavant <jeanmichel@sequans.com> - 2011-12-14 18:06 +0100
  Re: Overriding a global Terry Reedy <tjreedy@udel.edu> - 2011-12-10 19:14 -0500
  Re: Overriding a global Terry Reedy <tjreedy@udel.edu> - 2011-12-10 19:19 -0500
  Re: Overriding a global Peter Otten <__peter__@web.de> - 2011-12-11 09:14 +0100
  Re: Overriding a global Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2011-12-13 10:15 +0100

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