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Re: Question about name scope

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Ian Kelly wrote:
> On Wed, Feb 1, 2012 at 4:41 PM, Ethan Furman <ethan@stoneleaf.us> wrote:
>> I'm not sure what you mean by temporary:
>>
>> --> def f(x, y):
>>
>> ...     frob = None
>> ...     loc = locals()
>> ...     loc[x] = y
>> ...     print(loc)
>> ...     print(locals())
>> ...     print(loc)
>> ...     print(locals())
>> ...
>> -->
>> --> f('frob', 19)
>> {'y': 19, 'x': 'frob', 'frob': 19}
>> {'y': 19, 'x': 'frob', 'frob': None, 'loc': {...}}
>> {'y': 19, 'x': 'frob', 'frob': None, 'loc': {...}}
>> {'y': 19, 'x': 'frob', 'frob': None, 'loc': {...}}
>>
>> Seems to be stuck that way.
> 
> The first print is the one that is incorrect.  It suggests that the
> local 'frob' has been changed to 19 as it has in the dict, but the
> actual value of the local is still None.  The second print on
> accurately reflect that.

Ah.  Thanks for the explanations.

~Ethan~

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Thread

Question about name scope Olive <diolu@bigfoot.com> - 2012-02-01 18:11 +0100
  Re: Question about name scope Rick Johnson <rantingrickjohnson@gmail.com> - 2012-02-01 09:21 -0800
  Re: Question about name scope Ethan Furman <ethan@stoneleaf.us> - 2012-02-01 09:43 -0800
  Re: Question about name scope Dave Angel <d@davea.name> - 2012-02-01 12:36 -0500
    Re: Question about name scope Mel Wilson <mwilson@the-wire.com> - 2012-02-01 13:47 -0500
      Re: Question about name scope Ian Kelly <ian.g.kelly@gmail.com> - 2012-02-01 14:49 -0700
      Re: Question about name scope Ian Kelly <ian.g.kelly@gmail.com> - 2012-02-01 15:38 -0700
      Re: Question about name scope Ethan Furman <ethan@stoneleaf.us> - 2012-02-01 14:24 -0800
      Re: Question about name scope Ian Kelly <ian.g.kelly@gmail.com> - 2012-02-01 16:00 -0700
      Re: Question about name scope Ethan Furman <ethan@stoneleaf.us> - 2012-02-01 15:08 -0800
      Re: Question about name scope Ian Kelly <ian.g.kelly@gmail.com> - 2012-02-01 16:47 -0700
      Re: Question about name scope Ethan Furman <ethan@stoneleaf.us> - 2012-02-01 14:53 -0800
        Re: Question about name scope Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-02-02 00:34 +0000
      Re: Question about name scope Ethan Furman <ethan@stoneleaf.us> - 2012-02-01 15:59 -0800
      Re: Question about name scope Ethan Furman <ethan@stoneleaf.us> - 2012-02-01 15:41 -0800
      Re: Question about name scope Ethan Furman <ethan@stoneleaf.us> - 2012-02-01 15:51 -0800
  Re: Question about name scope Chris Rebert <clp2@rebertia.com> - 2012-02-01 09:38 -0800
  Re: Question about name scope Christian Heimes <lists@cheimes.de> - 2012-02-01 18:50 +0100

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